An Example Airport Issue

This is an example of the Airport Heat Island effect. From Wunderground, I’ve done a capture of the data from SJC San Jose International Airport along with the nearby stations that it reports from that area.

What they show, IMHO, is that the airport is about as “warmed” as the major urban center of San Jose, while both are warmer than the areas just a bit removed toward the more suburban areas (that are themselves UHI afflicted, just not as badly being a bit closer to some undeveloped hillsides). I’ve tagged the data with the time and date when I did the screen capture.

4:09 am 15 June 2012   

Weather Station
San Jose (KSJC)
Elevation
56 ft 

Clear
Temperature
53.6 °F
Feels Like 54 °F 
Wind(mph)
8.1 


82 °F 
Clear
Tonight

So what this says is that right now, the airport is 53.6 F and claims a wind speed of 8.1 MPH. The minor problem is that nowhere around it has “wind” and sitting in my back yard (just a few miles away) the air is almost dead calm. Sporadic very calm ‘drifts’ of air at about 1 mph maybe… Leaves in the trees not moving at all. I would guess that the 8 mph was from some airplane, or there is some other local effect generating breezes that are not area wide (such as thermals?)

At an rate, wind disrupts the still air that lets a surface cool most dramatically on a cold clear night. A couple of the surrounding stations have similar temperatures, but many are far cooler. This illustrates two things about the use of Airports as temperature reporting stations, IMHO.

1) There’s a degree or two variation in what is the same air basin with the same weather. Exactly which of these is correct? How can we say that any given basin has “warmed” by a degree or even two when we can get that much change just out of minor siting variations and nearly ALL stations have had changes of about that magnitude?

2) To my quick scan, more of the stations are cooler. It would be best to do some sort of statistical plot of the data, but right now, this is “hot off the presses”. More importantly, from personal knowledge of the locations, those stations that are more suburban and a bit closer to the original environment are the cool ones. The warm ones are nearer to development, concrete and roadways. It’s pretty clear to me that the development around and at the airport cuts a degree or two off the lower temperatures on cold clear nights. Just the pattern we see in the data. “Cold clipping”.

I’ll be putting some comments scattered through this list, giving my assessment of each area.

Weather Stations Station Location	Temp.	Windchill	Dew Point	Humidity	Wind	Precipitation	Elevation	Updated	Type	Website
San Jose Plant51, San Jose, CA	53.3 °F	-	45 °F 	73%	NNW  at  3.0 mph 	0.00 in / hr	163 ft	1 sec ago	Rapid Fire	 
SJSU-ATN, San Jose, CA	53.4 °F 	-	48 °F 	81%	South  at  9.0 mph 	0.00 in / hr	79 ft	0 sec ago	Rapid Fire	 
Lawrence, Santa Clara, CA	53.4 °F	-	48 °F 	80%	ESE  at  3.0 mph 	0.00 in / hr	69 ft	38 sec ago	Normal	 

These are all heavily urban areas. They all run about the same as the airport. Lawrence is the Lawrence Expressway area of Santa Clara, heart of the semiconductor part of Silicon Valley. SJSU is Sah Jose State University, embedded in the downtown area of San Jose proper and near high rise office buildings and between freeways. They all show a bit of wind, with SJSU showing 9 mph. I have to wonder if there is some local disruption of air flow. They are essentially just to the east of the landing pattern. A bit off the south end of the runway.

Santa Clara, CA	52.6 °F 	-	47 °F 	82%	SSE  at  0.0 mph 	0.00 in / hr	12 ft	12 sec ago	Rapid Fire	 
Santa Clara - Lawrence & Monroe, Santa Clara, CA	53.2 °F 	-	47 °F 	80%	SSE  at  3.0 mph 	0.00 in / hr	88 ft	3 sec ago	Rapid Fire	 
APRSWXNET Santa Clara CA , Santa Clara, CA	52 °F 	-	47 °F 	84%	 NE   at  0 mph 	0.00 in / hr	116 ft	27 min 7 sec ago	MADIS	

The West side of the airport abuts Santa Clara. Notice that it’s about 1 F cooler. 52.6 F and 52 F. The reading close to the same at 53.2 F is still 0.4 F cooler. It is at “Lawrence and Monroe”. That’s over near the “Lawrence” station listed above. It is the intersection of one of the most heavily trafficked expressways in Silicon Valley with a major road leading to downtown Santa Clara. IMHO the more treed areas of Santa Clara are a bit closer to the original vegetated state of the valley, but still have significant UHI compared to the open grass and orchards of the 1800s.

North Willow Glen, San Jose, CA	58.6 °F 	-	46 °F 	62%	 NNW   at  0.0 mph 	0.00 in / hr	125 ft	3 hr 23 min 39 sec ago	Normal	
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Willow Glen is a residential area of San Jose just south of, and typically down wind of, the urban core and Airport.  It looks to me to be reading significantly high and may have specific site issues along with being downwind of the heat centers of the airport and high rise core.  Though with wind at 0.0 mph there ought not to be a lot of warmth drifting in. 

APRSWXNET Santa Clara CA , Santa Clara, CA	54 °F 	-	47 °F 	76%	 ESE   at  0 mph 	0.00 in / hr	137 ft	26 min 7 sec ago	MADIS	
Berryessa, San Jose, CA	51.0 °F 	-	49 °F 	92%	 NW   at  0.0 mph 	0.00 in / hr	131 ft	4 min 18 sec ago	Normal	

These two make an interesting set. We’ve got a 5 F range between the two of them. I don’t know where the APRSWXNET station is, but it’s an Amature Radio station I think. Berryessa is a more open suburb area toward the east and a bit north from the airport and approaching the hills. It is further from the urban core, but still near a large freeway. It will get the cooling descending air off of the hillsides that characterizes still air cooling flows in the valley. ( Called “The Digger Pine Belt”, the air on the hillsides cools and descends into the valley, letting the upper areas of the hills stay warmer which the Digger Pines like while letting cold air pool in the valley. IMHO this is showing that happening, but unable to reach the airport as it used to do in the past prior to urbanization)

Wooding and Spruance, San Jose, CA	51.8 °F 	-	47 °F 	83%	NNE  at  2.3 mph 	0.00 in / hr	0 ft	20 sec ago	Rapid Fire	 
San Thomas/Hamilton, San Jose, CA	52.8 °F	-	45 °F 	75%	 North   at  0.0 mph 	0.00 in / hr	180 ft	4 sec ago	Rapid Fire	

San Thomas is another major expressway, but further south, and Hamilton is another major cross street. This intersection is a bit closer to the hills on the other (western) side of the valley and more south. Almost a straight line from Barryessa on the other side of the airport and urban core. I’m not familiar with Wooding and Spruance, so can’t comment on it. I just note in passing that two places away from the central concrete jungle are both about 1-2 F cooler.

Sunnyvale - Jasmine, Sunnyvale, CA	54.2 °F 	-	 - 	92%	 SSE   at  0.0 mph 	0.00 in / hr	70 ft	9 min 5 sec ago	Normal	 
Saratoga Ave./Doyle Rd., San Jose, CA	54.2 °F	-	45 °F 	69%	South  at  3.4 mph 	0.00 in / hr	190 ft	52 sec ago	Normal	 
Panama Park, SUNNYVALE, CA	54.9 °F 	-	46 °F 	71%	 East   at  0.1 mph 	0.00 in / hr	154 ft	3 min 10 sec ago	Normal	 
Ortega Park, Sunnyvale, CA	52.7 °F	-	44 °F 	71%	 SSE   at  1.4 mph 	0.00 in / hr	118 ft	16 sec ago	Rapid Fire	 

Sunnyvale is a mile or two further west from Lawrence Expressway. It ranges up to the edge of Moffett Field area (though Mountain View is closer) and is about the same distance from the bay as Santa Clara. It is part of the same “Urban Metroplex”. It would be interesting to find the Panama Park and Ortega Park stations and see what makes those two “parks” different. Why do we get 2.2 F of difference between them. The 36 foot elevation difference implies a bit of separation. Worth a pick at some point. Saratoga Ave. is a major surface street. I’m pretty sure that puts the Doyle station in a UHI area.

Alum Rock Park, San Jose, CA	50.7 °F 	-	34 °F 	52%	 North   at  0.0 mph 	0.00 in / hr	203 ft	28 sec ago	Normal	

Alum Rock Park is a couple of miles more into the hills than Barryessa (though just a bit south of it). The 203 foot elevation gives you an idea. It is JUST outside of the development with houses right up to the entrance. It is a nice rural park with camping type areas, not an “urban grass island”. IMHO, that temperature is fairly representative of the area minus UHI and development. A good 3 F below the heat island.

APRSWXNET Sunnyvale CA , Sunnyvale, CA	55 °F 	-	45 °F 	68%	 East   at  0 mph 	0.00 in / hr	127 ft	29 min 7 sec ago	MADIS	

A nice hot station back down in Silicon Gulch…

Comstock Ln and Park Wilshire Cr, San Jose, CA	52.2 °F 	-	46 °F 	82%	East  at  4.0 mph 	0.00 in / hr	188 ft	1 sec ago	Rapid Fire	 
MotherShip, Mariani Orchard, Cupertino, CA	52.3 °F 	-	46 °F 	79%	 East   at  1.6 mph 	0.00 in / hr	232 ft	2 sec ago	Rapid Fire	 

Here we get to Cupertino and Mariani Orchard. Years ago when I first came here it WAS an orchard. Now it’s a patch of “last to become apartments” as one approaches the Apple Computer campus. If it is where I think it is, it still as a patch of the old cherry trees. I note, too, that the 188 ft elevation part of San Jose is about the same. A good 1 F below the airport…

AeroDynamic Aviation-RHV, San Jose, CA	55.1 °F 	-	48 °F 	78%	 South   at  4.5 mph 	0.00 in / hr	133 ft	4 min 34 sec ago	Normal	
Purdue Drive, Saratoga, CA	51.3 °F	-	46 °F 	83%	 WSW   at  0.0 mph 	0.00 in / hr	242 ft	1 sec ago	Rapid Fire	 

An interesting set. I’m pretty sure that AeroDynamaic Aviation is at the Reid Hillview Airport. They are a flight school. It is surrounded by shopping centers, asphalt, and a freeway or two. Over by Berryessa, but it’s an airport… Warm, too. Not very far from the Alum Rock park either. But what a difference a chunk of tarmac makes… Folks landing at Reid Hillview approach over the Eastridge Shopping Center parking lots and buildings and every so often someone lands on them… Basically it’s an asphalt jungle for a few miles around this place. I think that shows in the temperature.

Saratoga is back over on the west side, up in the lower edge of the hills on that side. Nice and cool away and a bit above the asphalt jungle. More representative of the “small village” phase prior to full paving of Silicon Valley… So we get 51.3 F compared with the 54-55 F of the asphalted areas.

Next up are several more very cold thermometers. Homestead is part of Sunnyvale down near (closer to the hills and near that Orchard area above IIRC). Then another Saratoga that’s even further south and closer to the hills.

Homestead/Kennewick, Sunnyvale, CA	50.9 °F 	-	42 °F 	70%	SSW  at  4.0 mph 	0.00 in / hr	225 ft	15 sec ago	Rapid Fire	 
APRSWXNET Saratoga CA , San Jose, CA	50 °F 	-	44 °F 	79%	 SSE   at  0 mph 	0.00 in / hr	286 ft	29 min 7 sec ago	MADIS	
Utopia Pl, San Jose, CA	49.7 °F 	50 °F 	42 °F 	76%	 East   at  1.1 mph 	0.00 in / hr	301 ft	5 sec ago	Rapid Fire	 
Cambrian-Camden/Leigh, San Jose, CA	50.9 °F	-	47 °F 	85%	SSE  at  5.6 mph 	0.00 in / hr	221 ft	11 sec ago	Rapid Fire	 

Don’t know where Utopia Place is as, but the 301 ft elevation puts it near the edge toward the hills. Cambrian – Camden/Leigh is closer to the urban core, but still out of it. A bit south east from the airport and headed sort of toward Campbell and eventually Saratoga (but closer to San Jose downtown than Saratoga and the hills). It’s generally a well treed area with homes with open
yards and only small scattered shopping centers.

Don’t know where Westmont High School is at, but the elevation puts it a bit away from the airport. Things generally start out at zero at Alviso (just across the 101 Freeway from the airport) rise to about 100 feet modestly quickly getting out of the urban core into the suburbs, then rise to a couple of hundred feet just as you enter the hills that surround the valley. The hills rapidly rise to several hundred feet and are only sparsely covered with houses (and mostly very expensive ones…)

Near Westmont HS, San Jose, CA	52.1 °F 	-	47 °F 	83%	 SE   at  0.0 mph 	 - / hr	260 ft	4 min 4 sec ago	Normal	 
SW Sunnyvale, Sunnyvale, CA	50.8 °F	-	44 °F 	79%	 SE   at  0.0 mph 	 - / hr	500 ft	1 min 7 sec ago	Normal	 
RAWS SANJOSE CA, San Jose, CA	49 °F 	49 °F 	43 °F 	81%	 NNE   at  3 mph 	0.00 in / hr	674 ft	1 hr 17 min 7 sec ago	MADIS	
Sunnyvale, Sunnyvale, CA	49.9 °F 	50 °F 	43 °F 	77%	 SE   at  0.0 mph 	0.00 in / hr	330 ft	9 min 51 sec ago	Normal	 

Looking at the elevation on those Sunnyvale stations, I’d guess them to be in the bit of Sunnyvale that once again gets out of the center of the Silicon Valley bowl, and just at the edge near the start of the hills. Also that RAWS station in San Jose is clearly up a hillside somewhere at 674 ft elevation.

What all this says to me is pretty simple. Where years ago the cold air would be shed by the hillsides and sink to the valley floor, making it colder than the hills, we now have enough UHI to warm that cold air as it sinks into the valley. The airport areas are running a couple of degrees warmer than the surroundings, and that heat grades with distance. It is especially evident when there are nights with still air and clear skies. Then we “clip the negative excursions” off the readings.

Just like we see in the GHCN record where once the thermometers all moved to the airports, the range of readings reduces dramatically and it all comes out of ‘peak clipping’ the cold spikes. The hot side doesn’t get any hotter, we just trim off the cold by a couple of degrees on clear cold nights…

As I type, the sun is just starting to lighting the horizon. It’s now 5:30 AM. Here’s the data capture from 5:27, so folks can see how temperatures developed during the last 1 1/2 hours. On a quick scan it looks to me like the cool areas continued to cool faster and the airport only lost a few 1/10ths F. Soon the sun will be warming the tarmac and it ought to rise rapidly…

But I’m feeling a bit cold and want a cup of Good Morning Jo Coffee.. so someone else will need to “compare and contrast” the two listings…


San Jose International Weather at a Glance 
Weather Station
San Jose (KSJC)
Elevation
56 ft 
Station Select
Now

Clear
Temperature
53 °F 
Feels Like 53 °F 
Wind(mph)
8

ther Stations Station Location	Temp.	Windchill	Dew Point	Humidity	Wind	Precipitation	Elevation	Updated	Type	Website
San Jose Plant51, San Jose, CA	52.6 °F 	-	45 °F 	76%	NNW  at  1.0 mph 	0.00 in / hr	163 ft	3 sec ago	Rapid Fire	 
SJSU-ATN, San Jose, CA	52.7 °F 	-	48 °F 	84%	 South   at  8.0 mph 	0.00 in / hr	79 ft	3 sec ago	Rapid Fire	 
Lawrence, Santa Clara, CA	52.0 °F 	-	47 °F 	84%	SE  at  2.0 mph 	0.00 in / hr	69 ft	41 sec ago	Normal	 
Santa Clara, CA	51.2 °F 	-	47 °F 	85%	 ESE   at  0.0 mph 	0.00 in / hr	12 ft	14 sec ago	Rapid Fire	 
Santa Clara - Lawrence & Monroe, Santa Clara, CA	51.9 °F	-	47 °F 	83%	 SE   at  4.0 mph 	0.00 in / hr	88 ft	2 sec ago	Rapid Fire	 
APRSWXNET Santa Clara CA , Santa Clara, CA	51 °F 	-	47 °F 	86%	 SE   at  0 mph 	0.00 in / hr	116 ft	30 min 59 sec ago	MADIS	
APRSWXNET Santa Clara CA , Santa Clara, CA	52 °F 	-	46 °F 	79%	 ESE   at  1 mph 	0.00 in / hr	137 ft	24 min 59 sec ago	MADIS	
Berryessa, San Jose, CA	51.0 °F 	-	50 °F 	95%	 South   at  0.0 mph 	0.00 in / hr	131 ft	3 min 10 sec ago	Normal	
Wooding and Spruance, San Jose, CA	50.9 °F 	-	48 °F 	88%	NE  at  3.6 mph 	0.00 in / hr	0 ft	24 sec ago	Rapid Fire	 
San Thomas/Hamilton, San Jose, CA	51.4 °F 	-	45 °F 	78%	 North   at  0.0 mph 	0.00 in / hr	180 ft	8 sec ago	Rapid Fire	
Sunnyvale - Jasmine, Sunnyvale, CA	52.5 °F	-	 - 	95%	 South   at  0.0 mph 	0.00 in / hr	70 ft	18 sec ago	Normal	 
Saratoga Ave./Doyle Rd., San Jose, CA	52.8 °F 	-	44 °F 	72%	 North   at  0.0 mph 	0.00 in / hr	190 ft	4 min 3 sec ago	Normal	 
Panama Park, SUNNYVALE, CA	53.7 °F 	-	46 °F 	75%	 East   at  2.0 mph 	0.00 in / hr	154 ft	12 min 2 sec ago	Normal	 
Ortega Park, Sunnyvale, CA	51.6 °F 	-	45 °F 	79%	 ESE   at  1.2 mph 	0.00 in / hr	118 ft	20 sec ago	Rapid Fire	 
Alum Rock Park, San Jose, CA	50.7 °F 	-	36 °F 	57%	ESE  at  0.0 mph 	0.00 in / hr	203 ft	20 sec ago	Normal	
APRSWXNET Sunnyvale CA , Sunnyvale, CA	54 °F 	-	44 °F 	70%	 ESE   at  0 mph 	0.00 in / hr	127 ft	27 min 59 sec ago	MADIS	
Comstock Ln and Park Wilshire Cr, San Jose, CA	51.1 °F 	-	47 °F 	85%	 ESE   at  0.0 mph 	0.00 in / hr	188 ft	2 sec ago	Rapid Fire	 
MotherShip, Mariani Orchard, Cupertino, CA	51.3 °F 	-	48 °F 	90%	 NE   at  1.6 mph 	0.00 in / hr	232 ft	4 sec ago	Rapid Fire	 
AeroDynamic Aviation-RHV, San Jose, CA	53.6 °F 	-	48 °F 	81%	 WSW   at  4.3 mph 	0.00 in / hr	133 ft	3 min 23 sec ago	Normal	
Purdue Drive, Saratoga, CA	50.5 °F 	-	46 °F 	85%	SE  at  0.0 mph 	0.00 in / hr	242 ft	1 sec ago	Rapid Fire	 
Homestead/Kennewick, Sunnyvale, CA	50.4 °F 	-	45 °F 	83%	SSE  at  4.0 mph 	0.00 in / hr	225 ft	13 sec ago	Rapid Fire	 
APRSWXNET Saratoga CA , San Jose, CA	50 °F 	-	47 °F 	89%	 NE   at  0 mph 	0.00 in / hr	286 ft	27 min 59 sec ago	MADIS	
Utopia Pl, San Jose, CA	49.0 °F 	49 °F 	44 °F 	82%	 NE   at  0.7 mph 	0.00 in / hr	301 ft	6 sec ago	Rapid Fire	 
Cambrian-Camden/Leigh, San Jose, CA	50.0 °F 	49 °F 	47 °F 	90%	ESE  at  5.4 mph 	0.00 in / hr	221 ft	3 sec ago	Rapid Fire	 
Near Westmont HS, San Jose, CA	50.8 °F 	-	47 °F 	85%	 ESE   at  0.0 mph 	 - / hr	260 ft	7 min 49 sec ago	Normal	 
SW Sunnyvale, Sunnyvale, CA	50.8 °F 	-	47 °F 	85%	 ESE   at  0.0 mph 	 - / hr	500 ft	4 min 59 sec ago	Normal	 
RAWS SANJOSE CA, San Jose, CA	47 °F 	47 °F 	44 °F 	89%	 NNE   at  1 mph 	0.00 in / hr	674 ft	35 min 59 sec ago	MADIS	
Sunnyvale, Sunnyvale, CA	51.2 °F 	-	46 °F 	81%	 SE   at  0.0 mph 	0.00 in / hr	330 ft	13 min 13 sec ago	Normal	 

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About E.M.Smith

A technical managerial sort interested in things from Stonehenge to computer science. My present "hot buttons' are the mythology of Climate Change and ancient metrology; but things change...
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12 Responses to An Example Airport Issue

  1. E.M.Smith says:

    Oh, and a small “Above and beyond” before I made coffee… Grabbed my old photo chemical thermometer that’s pretty accurate. ( in the 1/10ths F or your colors are a bit off..)

    The top of the car with dew on it is 49.5 F and waving it in free air it’s at 50 F and a smidgeon. 50.2 F or so. I’m at 60 something foot elevation and just a bit beyond single digit miles south of the airport in ‘suburban neighborhood’. Definitely the same climate zone, and the same microclimate area. So IMHO that makes the Airport about 2.5 F to 3 F of Airport Heat Island on cool still evenings. One of those a month and you get a nice 1/2 C or so “warming trend” just from turning the old Grass Field Airport into the modern Concrete Jungle International Airport.

    Man Mad Warming, but not a lot to do with CO2 in the air… (coming out the jet exhaust, at the airport at takeoff, sure…)

    And just from a sense of excessive completion, here’s a capture of the data from Moffett Field (a few miles just north west on 101 from San Jose International and also on the edge of the bay) and surrounding stations. A quick “eyeball” of the listing looks to me like it has the sam pattern.

    
    CAPTUER FROM MOFFETT FIELD 
    5:58 AM
    
    Moffett Federal Air Field
    
    Weather at a Glance 
    Weather Station
    Moffett NAS (KNUQ)
    Elevation
    33 ft 
    
    Clear
    Temperature
    53 °F 
    Feels Like 53 °F 
    Wind(mph)
    9
    Sunrise / Set
    5:46 AM
    8:30 PM
    Moon
    Waning Crescent
    More Astronomy
    
     Today
    
    81 °F 
    Clear
    
    Station Location	Temp.	Windchill	Dew Point	Humidity	Wind	Precipitation	Elevation	Updated	Type	Website
    Mountain Shadows, Mountain View, CA	52.8 °F 	-	43 °F 	70%	 ESE   at  0.0 mph 	0.00 in / hr	50 ft	4 min 21 sec ago	Normal	 
    MLoma, Mountain View, CA	54.3 °F 	-	44 °F 	67%	SW  at  0.0 mph 	0.00 in / hr	30 ft	22 sec ago	Rapid Fire	 
    Mountain View, CA	54.1 °F 	-	 - 	-	 North   at   - 	 - / hr	50 ft	3 min 31 sec ago	Normal	 
    Mountain View, Mountain View, CA	54.5 °F 	-	42 °F 	64%	 NW   at  0.0 mph 	0.00 in / hr	10 ft	3 min 4 sec ago	Normal	 
    Cuesta Park, Mountain View, Mountain View, CA	55.0 °F	-	47 °F 	68%	WNW  at  3.0 mph 	0.00 in / hr	104 ft	7 sec ago	Rapid Fire	 
    Walnut Grove, Palo Alto, CA	50.7 °F 	-	47 °F 	88%	 East   at  0.0 mph 	0.00 in / hr	36 ft	3 min 8 sec ago	Normal	 
    Midtown, Palo Alto, CA	52.7 °F 	-	42 °F 	66%	South  at  0.0 mph 	 - / hr	7 ft	12 sec ago	Rapid Fire	 
    Sunnyvale - Jasmine, Sunnyvale, CA	52.2 °F 	-	 - 	95%	 SSE   at  0.0 mph 	0.00 in / hr	70 ft	4 min 42 sec ago	Normal	 
    Los Altos, CA	49.6 °F 	50 °F 	42 °F 	75%	 NNW   at  0.0 mph 	0.00 in / hr	100 ft	3 min 7 sec ago	Normal	 
    Ohlone Farm, Palo Alto, CA	49.1 °F 	49 °F 	45 °F 	85%	 SW   at  0.0 mph 	0.00 in / hr	15 ft	2 sec ago	Rapid Fire	
    Palo Alto (Midtown), Palo Alto, CA	50.3 °F 	-	45 °F 	83%	 SSW   at  0.0 mph 	0.00 in / hr	3 ft	3 min 10 sec ago	Normal	 
    Barron Park, Palo Alto, CA	48.4 °F 	48 °F 	41 °F 	76%	 SSW   at  0.0 mph 	0.00 in / hr	40 ft	4 sec ago	Rapid Fire	 
    APRSWXNET Sunnyvale CA , Sunnyvale, CA	54 °F 	-	45 °F 	71%	 SSE   at  0 mph 	0.00 in / hr	127 ft	28 min 12 sec ago	MADIS	
    Santa Clara - Lawrence & Monroe, Santa Clara, CA	51.7 °F 	-	47 °F 	83%	SE  at  3.0 mph 	0.00 in / hr	88 ft	2 sec ago	Rapid Fire	 
    Lawrence, Santa Clara, CA	51.9 °F 	-	47 °F 	84%	 ESE   at  2.0 mph 	0.00 in / hr	69 ft	44 sec ago	Normal	 
    Los Altos Hills, CA	49.8 °F 	50 °F 	50 °F 	100%	 South   at  0.0 mph 	0.00 in / hr	96 ft	3 min 12 sec ago	Normal	 
    Panama Park, SUNNYVALE, CA	53.1 °F	-	46 °F 	76%	SE  at  1.1 mph 	0.00 in / hr	154 ft	6 sec ago	Normal	 
    SW Sunnyvale, Sunnyvale, CA	50.3 °F 	-	46 °F 	86%	 ESE   at  0.0 mph 	 - / hr	500 ft	5 min 12 sec ago	Normal	 
    Old Palo Alto (Waverley St), Palo Alto, CA	48.7 °F	49 °F 	44 °F 	83%	South  at  0.4 mph 	0.00 in / hr	57 ft	14 sec ago	Rapid Fire	
    Homestead/Kennewick, Sunnyvale, CA	50.0 °F 	-	45 °F 	84%	SSE  at  3.0 mph 	0.00 in / hr	225 ft	2 sec ago	Rapid Fire	 
    Los Altos Country Club, Los Altos, CA	46.4 °F 	46 °F 	44 °F 	91%	 ENE   at  0.0 mph 	 - / hr	292 ft	8 min 52 sec ago	Normal	 
    Ortega Park, Sunnyvale, CA	51.3 °F 	-	46 °F 	81%	 East   at  0.0 mph 	0.00 in / hr	118 ft	9 sec ago	Rapid Fire	 
    Santa Clara, CA	50.9 °F 	-	47 °F 	86%	 ESE   at  0.0 mph 	0.00 in / hr	12 ft	2 sec ago	Rapid Fire	 
    Evergreen Park, Palo Alto, CA	50.4 °F 	-	42 °F 	74%	 North   at  0.0 mph 	0.00 in / hr	35 ft	5 min 42 sec ago	Normal	 
    Sunnyvale, Sunnyvale, CA	50.8 °F 	-	46 °F 	82%	 SSE   at  1.0 mph 	0.00 in / hr	330 ft	13 min 25 sec ago	Normal	 
    College Terrace, Palo Alto, CA	48.8 °F 	49 °F 	44 °F 	83%	 SSW   at  0.0 mph 	0.00 in / hr	43 ft	2 min 9 sec ago	Normal	 
    Foothill College, Los Altos Hills, CA	47.5 °F 	48 °F 	44 °F 	87%	 South   at  1.6 mph 	0.00 in / hr	361 ft	7 min 51 sec ago	Normal	
    MotherShip, Mariani Orchard, Cupertino, CA	50.9 °F 	-	48 °F 	91%	 East   at  1.6 mph 	0.00 in / hr	232 ft	7 sec ago	Rapid Fire	 
    Monta Vista North, Cupertino, CA	51.1 °F 	-	42 °F 	70%	 ESE   at  3.4 mph 	0.00 in / hr	340 ft	10 sec ago	Normal	 
    Palo Alto Park, East Palo Alto, CA	51.3 °F 	-	45 °F 	80%	 NE   at  0.0 mph 	0.00 in / hr	20 ft	2 hr 33 min 14 sec ago	Rapid Fire	 
    Los Altos Hills, Los Altos Hills, CA	48.4 °F 	48 °F 	44 °F 	86%	 WSW   at  0.0 mph 	0.00 in / hr	650 ft	59 sec ago	Rapid Fire	 
    
  2. kakatoa says:

    EM;

    I spent 20 years down in your neck of the orchards, woods, fields, etc. We used to watch the small planes land at Reid Hillview and we had cows for neighbors before the Silver Creek development took off way back when. The heat sink seemed to increase as we moved from the concrete jungle to an asphalt one. I guess one could say there might be a rather large SD when one tries to say what the AVG, Min or Max temp is in the south bay.

  3. malanlewis says:

    Interesting that, over here in Santa Cruz, it’s usually cooler than the “official” temperature, measured at the Watsonsville airport. Generally when it’s warm, even slightly inland, cool ocean breezes off the fog keep us sublimely air conditioned.

    What does “global average surface temperature” have to do with that?

  4. malanlewis says:

    “Man Mad Warming” Freudian slip?

  5. Sandy McClintock says:

    I have one of those laser remote temperature sensor ‘pistols’ (used to check the thermal insulation of our new house). On a frosty morning, the difference between ground temperatures close to the house and further from the house can differ by 4 degrees – there is a gradient. It makes you aware of the importance of buildings and concrete!

  6. Pascvaks says:

    San Jose, CA, ‘NEW’ Forecast Guesstimate a’la NOAA (Edited)
    Tonight: Mostly clear, with a low around 60 (+/- 5). North northwest wind between 3 and 6 mph (+/- 3).
    _________________
    Maybe we should go to color codes, ie 33-42 Purple, 43-52 Blue, 53-62 Lt Blue, 63-72 Lt Green, 73-82 Green, Etc.
    And the forecast for tonight would be “Lt Blue to Lt Green”;-)

  7. E.M.Smith says:

    @Kakatoa:

    Kinda makes you wonder if the ‘leveling off of “warming” that came at the same time as economic stagnation might just be cause and effect…

    @Sandy McClintock:

    I gotta get me one of those gizmos… sounds like fun ;-)

    @Pascvaks:

    Or “muddy brown with a chance of sea foam green”? ;-)

    @All:

    Just for grins, since today was “sunny and hot” for the first time in a long time, I wondered about the “cool down” profile of SJC:

    Oddly, it said “82” when I started the “copy / paste” operation, but I started with all the “other” stations. When I got back to the top, the airport was down 1.8 F in all of a couple of minutes. I’d quess something was queued up and slow… At any rate, not as dramatic as the 82 F, but it’s still a bit warmer than the nearby areas:

    San Jose International Weather at a Glance 
    Weather Station
    San Jose (KSJC)
    Elevation
    56 ft 
    Station Select
    Now
    
    Scattered Clouds
    Temperature
    80.1 °F
    Feels Like 82 °F
    
    Weather Stations Station Location	Temp.	Heat Index	Dew Point	Humidity	Wind	Precipitation	Elevation	Updated	Type	Website
    Near Montague School, Santa Clara, CA	77.5 °F 	79 °F 	54 °F 	44%	 West   at  0.0 mph 	0.00 in / hr	20 ft	5 sec ago	Rapid Fire	 
    San Jose Plant51, San Jose, CA	80.0 °F 	80 °F 	50 °F 	36%	 WSW   at  0.0 mph 	0.00 in / hr	163 ft	52 sec ago	Rapid Fire	 
    SJSU-ATN, San Jose, CA	80.1 °F 	80 °F 	53 °F 	39%	 South   at  1.0 mph 	0.00 in / hr	79 ft	2 sec ago	Rapid Fire	 
    Lawrence, Santa Clara, CA	75.4 °F 	78 °F 	54 °F 	47%	 SSW   at  0.0 mph 	0.00 in / hr	69 ft	57 sec ago	Normal	 
    Santa Clara, CA	73.6 °F 	77 °F 	54 °F 	50%	 NW   at  0.0 mph 	0.00 in / hr	12 ft	19 sec ago	Rapid Fire	 
    Santa Clara - Lawrence & Monroe, Santa Clara, CA	74.9 °F 	78 °F 	56 °F 	51%	 WNW   at  0.0 mph 	0.00 in / hr	88 ft	3 sec ago	Rapid Fire	 
    APRSWXNET Santa Clara CA , Santa Clara, CA	73 °F 	77 °F 	55 °F 	54%	 West   at  0 mph 	0.00 in / hr	116 ft	26 min 19 sec ago	MADIS	
    Cypress Ave, San Jose, CA	75.9 °F 	78 °F 	48 °F 	38%	 WNW   at  0.0 mph 	0.00 in / hr	150 ft	20 sec ago	Rapid Fire	 
    North Willow Glen, San Jose, CA	76.8 °F 	78 °F 	52 °F 	42%	 West   at  0.0 mph 	0.00 in / hr	125 ft	2 min 12 sec ago	Normal	
    APRSWXNET Santa Clara CA , Santa Clara, CA	78 °F 	79 °F 	52 °F 	40%	 West   at  0 mph 	0.00 in / hr	137 ft	25 min 19 sec ago	MADIS	
    Berryessa, San Jose, CA	77.0 °F 	78 °F 	52 °F 	41%	 East   at  0.0 mph 	0.00 in / hr	131 ft	3 min 38 sec ago	Normal	
    San Thomas/Hamilton, San Jose, CA	75.4 °F 	78 °F 	53 °F 	46%	 North   at  0.0 mph 	0.00 in / hr	180 ft	3 sec ago	Rapid Fire	
    Sunnyvale - Jasmine, Sunnyvale, CA	75.6 °F	78 °F 	 - 	56%	 WNW   at  0.0 mph 	0.00 in / hr	70 ft	16 sec ago	Normal	 
    Saratoga Ave./Doyle Rd., San Jose, CA	76.9 °F	78 °F 	54 °F 	45%	 North   at  0.0 mph 	0.00 in / hr	190 ft	13 sec ago	Normal	 
    Panama Park, SUNNYVALE, CA	74.7 °F 	77 °F 	50 °F 	42%	 West   at  0.0 mph 	 - / hr	154 ft	3 min 7 sec ago	Normal	 
    Campbell Ave. and Foote St., Campbell, CA	81.1 °F 	80 °F 	50 °F 	34%	 West   at  0.0 mph 	0.00 in / hr	30 ft	3 sec ago	Rapid Fire	 
    Alum Rock Park, San Jose, CA	76.8 °F 	77 °F 	34 °F 	21%	 NW   at  0.0 mph 	0.00 in / hr	203 ft	54 sec ago	Normal	
    Willow Glen, Lincoln, San Jose, CA	74.1 °F 	77 °F 	56 °F 	54%	 West   at  0.0 mph 	0.00 in / hr	125 ft	3 min 5 sec ago	Normal	 
    APRSWXNET Sunnyvale CA , Sunnyvale, CA	77 °F 	78 °F 	53 °F 	43%	 NNW   at  0 mph 	0.00 in / hr	127 ft	28 min 19 sec ago	MADIS	
    MotherShip, Mariani Orchard, Cupertino, CA	74.1 °F 	77 °F 	56 °F 	54%	 East   at  0.0 mph 	0.00 in / hr	232 ft	7 sec ago	Rapid Fire	 
    AeroDynamic Aviation-RHV, San Jose, CA	80.1 °F 	80 °F 	56 °F 	44%	 ESE   at  0.7 mph 	0.00 in / hr	133 ft	1 min 33 sec ago	Normal	
    Purdue Drive, Saratoga, CA	74.4 °F 	77 °F 	57 °F 	55%	 WSW   at  0.0 mph 	0.00 in / hr	242 ft	3 sec ago	Rapid Fire	 
    Homestead/Kennewick, Sunnyvale, CA	73.0 °F	77 °F 	48 °F 	41%	WNW  at  0.0 mph 	0.00 in / hr	225 ft	13 sec ago	Rapid Fire	 
    Utopia Pl, San Jose, CA	77.2 °F	78 °F 	47 °F 	35%	 ENE   at  1.3 mph 	0.00 in / hr	301 ft	5 sec ago	Rapid Fire	 
    Capitol Exp & Pearl Ave, San Jose, CA	79.9 °F 	80 °F 	56 °F 	46%	 North   at  0.0 mph 	0.00 in / hr	157 ft	1 hr 3 min 57 sec ago	Normal	 
    Near Westmont HS, San Jose, CA	76.3 °F 	78 °F 	58 °F 	53%	 South   at  0.0 mph 	 - / hr	260 ft	3 min 46 sec ago	Normal	 
    SW Sunnyvale, Sunnyvale, CA	75.7 °F 	78 °F 	57 °F 	53%	 ENE   at  0.0 mph 	 - / hr	500 ft	4 min 58 sec ago	Normal	 
    RAWS SANJOSE CA, San Jose, CA	77 °F 	78 °F 	45 °F 	32%	 NNW   at  2 mph 	0.00 in / hr	674 ft	1 hr 6 min 19 sec ago	MADIS	
    Sunnyvale, Sunnyvale, CA	75.3 °F 	78 °F 	55 °F 	50%	 North   at  0.0 mph 	0.00 in / hr	330 ft	4 min 21 sec ago	Normal	 
    

    So most of areas are a couple F cooler than the tarmact / parking lots / concrete of the airport.

    Even little old Reid Hillview airport is running hotter than nearby areas:

    Weather Station
    San Jose Reid (KRHV)
    Elevation
    131 ft 
    Station Select
    Now
    
    Mostly Cloudy
    Temperature
    81 °F 
    Feels Like 80 °F 
    Wind(mph)
    0
    Weather Stations Station Location	Temp.	Heat Index	Dew Point	Humidity	Wind	Precipitation	Elevation	Updated	Type	Website
    Near Montague School, Santa Clara, CA	77.5 °F 	79 °F 	54 °F 	45%	 West   at  0.0 mph 	0.00 in / hr	20 ft	2 min 18 sec ago	Rapid Fire	 
    San Jose Plant51, San Jose, CA	80.2 °F	80 °F 	50 °F 	36%	 WSW   at  0.0 mph 	0.00 in / hr	163 ft	5 sec ago	Rapid Fire	 
    SJSU-ATN, San Jose, CA	80.4 °F	80 °F 	53 °F 	39%	 South   at  2.0 mph 	0.00 in / hr	79 ft	5 sec ago	Rapid Fire	 
    Lawrence, Santa Clara, CA	75.4 °F	78 °F 	54 °F 	46%	 SSW   at  0.0 mph 	0.00 in / hr	69 ft	3 sec ago	Normal	 
    Santa Clara, CA	73.3 °F	77 °F 	54 °F 	51%	 NW   at  0.0 mph 	0.00 in / hr	12 ft	6 sec ago	Rapid Fire	 
    Santa Clara - Lawrence & Monroe, Santa Clara, CA	74.4 °F	78 °F 	56 °F 	51%	 WNW   at  0.0 mph 	0.00 in / hr	88 ft	1 sec ago	Rapid Fire	 
    APRSWXNET Santa Clara CA , Santa Clara, CA	72.0 °F	77 °F 	55 °F 	57%	 West   at  0.0 mph 	0.00 in / hr	116 ft	4 min 21 sec ago	MADIS	
    Cypress Ave, San Jose, CA	75.7 °F	78 °F 	48 °F 	38%	 WNW   at  0.0 mph 	0.00 in / hr	150 ft	30 sec ago	Rapid Fire	 
    North Willow Glen, San Jose, CA	76.6 °F	78 °F 	52 °F 	42%	 West   at  0.0 mph 	0.00 in / hr	125 ft	5 min 52 sec ago	Normal	
    APRSWXNET Santa Clara CA , Santa Clara, CA	78.0 °F	79 °F 	52 °F 	41%	 West   at  0.0 mph 	0.00 in / hr	137 ft	4 min 24 sec ago	MADIS	
    Berryessa, San Jose, CA	77.0 °F 	78 °F 	52 °F 	40%	 East   at  0.0 mph 	0.00 in / hr	131 ft	2 min 35 sec ago	Normal	
    San Thomas/Hamilton, San Jose, CA	75.1 °F	78 °F 	53 °F 	47%	 North   at  0.0 mph 	0.00 in / hr	180 ft	7 sec ago	Rapid Fire	
    Sunnyvale - Jasmine, Sunnyvale, CA	75.3 °F	78 °F 	 - 	56%	 WNW   at  0.0 mph 	0.00 in / hr	70 ft	4 min 4 sec ago	Normal	 
    Saratoga Ave./Doyle Rd., San Jose, CA	76.7 °F	78 °F 	54 °F 	45%	 North   at  0.0 mph 	0.00 in / hr	190 ft	4 min 7 sec ago	Normal	 
    Panama Park, SUNNYVALE, CA	74.2 °F	77 °F 	50 °F 	42%	 West   at  0.0 mph 	 - / hr	154 ft	2 min 4 sec ago	Normal	 
    Campbell Ave. and Foote St., Campbell, CA	81.0 °F	80 °F 	50 °F 	35%	 West   at  0.0 mph 	0.00 in / hr	30 ft	3 sec ago	Rapid Fire	 
    Alum Rock Park, San Jose, CA	76.5 °F	77 °F 	34 °F 	21%	East  at  2.7 mph 	0.00 in / hr	203 ft	54 sec ago	Normal	
    Willow Glen, Lincoln, San Jose, CA	73.6 °F	77 °F 	56 °F 	56%	South  at  0.0 mph 	0.00 in / hr	125 ft	1 min 57 sec ago	Normal	 
    APRSWXNET Sunnyvale CA , Sunnyvale, CA	76.0 °F	78 °F 	53 °F 	45%	 NNW   at  0.0 mph 	0.00 in / hr	127 ft	4 min 23 sec ago	MADIS	
    MotherShip, Mariani Orchard, Cupertino, CA	74.3 °F	77 °F 	56 °F 	55%	 East   at  0.0 mph 	0.00 in / hr	232 ft	4 sec ago	Rapid Fire	 
    AeroDynamic Aviation-RHV, San Jose, CA	79.6 °F	80 °F 	56 °F 	43%	SE  at  2.5 mph 	0.00 in / hr	133 ft	30 sec ago	Normal	
    Purdue Drive, Saratoga, CA	73.5 °F	77 °F 	57 °F 	56%	 WSW   at  0.0 mph 	0.00 in / hr	242 ft	1 sec ago	Rapid Fire	 
    Homestead/Kennewick, Sunnyvale, CA	72.9 °F	77 °F 	48 °F 	41%	West  at  0.0 mph 	0.00 in / hr	225 ft	8 sec ago	Rapid Fire	 
    Utopia Pl, San Jose, CA	77.0 °F	78 °F 	47 °F 	36%	ESE  at  1.1 mph 	0.00 in / hr	301 ft	5 sec ago	Rapid Fire	 
    Capitol Exp & Pearl Ave, San Jose, CA	79.9 °F 	80 °F 	56 °F 	46%	 North   at  0.0 mph 	0.00 in / hr	157 ft	1 hr 12 min 54 sec ago	Normal	 
    Near Westmont HS, San Jose, CA	76.3 °F 	78 °F 	58 °F 	53%	 South   at  0.0 mph 	 - / hr	260 ft	12 min 43 sec ago	Normal	 
    SW Sunnyvale, Sunnyvale, CA	75.7 °F 	78 °F 	57 °F 	53%	 ENE   at  0.0 mph 	 - / hr	500 ft	13 min 55 sec ago	Normal	 
    RAWS SANJOSE CA, San Jose, CA	77 °F 	78 °F 	45 °F 	32%	 NNW   at  2 mph 	0.00 in / hr	674 ft	1 hr 15 min 16 sec ago	MADIS	
    Sunnyvale, Sunnyvale, CA	75.3 °F 	78 °F 	55 °F 	50%	 North   at  0.0 mph 	0.00 in / hr	330 ft	13 min 18 sec ago	Normal	 
    

    It sure looks to me like showing Airport Heat Island isn’t all that hard… So I wonder why the bulk of all current stations in the GHCN are at airports….

  8. E.M.Smith says:

    That’s interesing, KSJC just bounced back up to 82…

    San Jose International Weather at a Glance 
    Weather Station
    San Jose (KSJC)
    Elevation
    56 ft 
    Station Select
    Now
    
    Scattered Clouds
    Temperature
    82 °F 
    Feels Like 82 °F 
    Wind(mph)
    0
    Sunrise / Set
    5:46 AM
    8:30 PM
    Moon
    Waning Crescent
    More Astronomy
    Tonight
    
     61 °F 
    Mostly Cloudy 
    
    
    So I make that about a 1.8 F "chatter" in the signal...
  9. E.M.Smith says:

    Continuing on into the night.. It’s now 2:45 AM and we still have a “high offset” to the airport:

    San Jose International Weather at a Glance 
    Weather Station
    San Jose (KSJC)
    Elevation
    56 ft 
    Station Select
    Now
    
    Clear
    Temperature
    72 °F 
    Feels Like 72 °F 
    Wind(mph)
    8
    
    
    Tonight
    
     61 °F 
    Partly Cloudy
    
    Weather Stations Station Location	Temp.	Heat Index	Dew Point	Humidity	Wind	Precipitation	Elevation	Updated	Type	Website
    Near Montague School, Santa Clara, CA	71.7 °F 	77 °F 	49 °F 	46%	 ESE   at  5.1 mph 	0.00 in / hr	20 ft	6 sec ago	Rapid Fire	 
    San Jose Plant51, San Jose, CA	70.5 °F	77 °F 	48 °F 	45%	SSE  at  4.0 mph 	0.00 in / hr	163 ft	0 sec ago	Rapid Fire	 
    SJSU-ATN, San Jose, CA	70.2 °F 	77 °F 	50 °F 	49%	 SW   at  10.0 mph 	0.00 in / hr	79 ft	4 sec ago	Rapid Fire	 
    Lawrence, Santa Clara, CA	68.6 °F	-	52 °F 	54%	 SSW   at  0.0 mph 	0.00 in / hr	69 ft	7 sec ago	Normal	 
    Santa Clara, CA	68.3 °F	-	52 °F 	56%	 South   at  0.0 mph 	0.00 in / hr	12 ft	23 sec ago	Rapid Fire	 
    Santa Clara - Lawrence & Monroe, Santa Clara, CA	68.2 °F	-	52 °F 	57%	 SSE   at  0.0 mph 	0.00 in / hr	88 ft	0 sec ago	Rapid Fire	 
    APRSWXNET Santa Clara CA , Santa Clara, CA	66 °F 	-	52 °F 	61%	 SSE   at  0 mph 	0.00 in / hr	116 ft	28 min 13 sec ago	MADIS	
    Cypress Ave, San Jose, CA	75.2 °F 	77 °F 	47 °F 	37%	 SE   at  0.0 mph 	0.00 in / hr	150 ft	2 hr 51 min 41 sec ago	Rapid Fire	 
    North Willow Glen, San Jose, CA	71.2 °F 	77 °F 	49 °F 	45%	 West   at  0.0 mph 	0.00 in / hr	125 ft	1 hr 3 min 35 sec ago	Normal	
    APRSWXNET Santa Clara CA , Santa Clara, CA	71.0 °F	77 °F 	50 °F 	47%	 ESE   at  0.0 mph 	0.00 in / hr	137 ft	2 min 41 sec ago	MADIS	
    Berryessa, San Jose, CA	67.0 °F	-	52 °F 	56%	 South   at  0.0 mph 	0.00 in / hr	131 ft	1 min 31 sec ago	Normal	
    San Thomas/Hamilton, San Jose, CA	68.8 °F	-	48 °F 	48%	 North   at  0.0 mph 	0.00 in / hr	180 ft	1 sec ago	Rapid Fire	
    Sunnyvale - Jasmine, Sunnyvale, CA	68.9 °F 	-	 - 	66%	 South   at  0.0 mph 	0.00 in / hr	70 ft	3 min 44 sec ago	Normal	 
    Saratoga Ave./Doyle Rd., San Jose, CA	70.4 °F 	77 °F 	49 °F 	46%	 North   at  0.0 mph 	0.00 in / hr	190 ft	3 min 48 sec ago	Normal	 
    Panama Park, SUNNYVALE, CA	68.7 °F	-	49 °F 	49%	 ENE   at  0.0 mph 	0.00 in / hr	154 ft	1 min 2 sec ago	Normal	 
    Campbell Ave. and Foote St., Campbell, CA	79.5 °F 	79 °F 	50 °F 	36%	 West   at  2.2 mph 	0.00 in / hr	30 ft	3 hr 1 min 45 sec ago	Rapid Fire	 
    Alum Rock Park, San Jose, CA	69.1 °F 	-	38 °F 	32%	 North   at  2.2 mph 	0.00 in / hr	203 ft	33 sec ago	Normal	
    Willow Glen, Lincoln, San Jose, CA	67.8 °F	-	52 °F 	57%	SSE  at  2.0 mph 	0.00 in / hr	125 ft	56 sec ago	Normal	 
    APRSWXNET Sunnyvale CA , Sunnyvale, CA	71.0 °F	77 °F 	52 °F 	51%	 SSE   at  0.0 mph 	0.00 in / hr	127 ft	2 min 40 sec ago	MADIS	
    Comstock Ln and Park Wilshire Cr, San Jose, CA	67.1 °F	-	48 °F 	50%	ESE  at  0.0 mph 	0.00 in / hr	188 ft	0 sec ago	Rapid Fire	 
    MotherShip, Mariani Orchard, Cupertino, CA	68.5 °F 	-	52 °F 	55%	 SW   at  0.0 mph 	0.00 in / hr	232 ft	1 sec ago	Rapid Fire	 
    AeroDynamic Aviation-RHV, San Jose, CA	71.6 °F	77 °F 	52 °F 	50%	NW  at  0.7 mph 	0.00 in / hr	133 ft	2 min 53 sec ago	Normal	
    Purdue Drive, Saratoga, CA	69.1 °F	-	51 °F 	52%	South  at  0.0 mph 	0.00 in / hr	242 ft	0 sec ago	Rapid Fire	 
    Homestead/Kennewick, Sunnyvale, CA	66.2 °F 	-	49 °F 	55%	 NNW   at  2.0 mph 	0.00 in / hr	225 ft	9 sec ago	Rapid Fire	 
    Utopia Pl, San Jose, CA	69.3 °F	-	47 °F 	46%	North  at  0.2 mph 	0.00 in / hr	301 ft	9 sec ago	Rapid Fire	 
    Near Westmont HS, San Jose, CA	69.8 °F 	-	52 °F 	53%	 SE   at  0.0 mph 	 - / hr	260 ft	6 min 28 sec ago	Normal	 
    SW Sunnyvale, Sunnyvale, CA	68.5 °F 	-	56 °F 	64%	 East   at  0.0 mph 	 - / hr	500 ft	7 min 51 sec ago	Normal	 
    RAWS SANJOSE CA, San Jose, CA	71.0 °F	77 °F 	47 °F 	42%	 ENE   at  1.0 mph 	0.00 in / hr	674 ft	2 min 18 sec ago	MADIS	
    Sunnyvale, Sunnyvale, CA	67.9 °F 	-	54 °F 	62%	 North   at  0.0 mph 	0.00 in / hr	330 ft	6 min 17 sec ago	Normal	 
    
  10. Pascvaks says:

    Thinking out loud: Wouldn’t a “San Jose Heat Island” (and others as well) impact normal precipitation over an extended period of time? (EM- maybe you’ve already scratched this dog too, shouldn’t the old STP rules show a change in rainfall patern in and around a city heat island, wouldn’t it tend to have lower pressure inside the dome with higher temps, and be drier too?)

  11. E.M.Smith says:

    @Pascvaks:

    I’ve got a couple of links open for an eventual “UHI and precipitation” posting that’s a WIP… and has been for a while. Nothing up yet, but yes, there are Urban impacts on rainfall.

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