Sunnyvale, CA

5:54 AM PDT on May 25, 2012 (GMT -0700)
Elev: 131 ft
Lon: 122.0° W
Lat: 37.4° N
Source
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Active Advisory: Special Statement (US Severe Weather)
Tropical Weather: Invest 94 (North Atlantic) Hurricane Bud (East Pacific) Typhoon Sanvu (Western Pacific)
Weather Summary
Jessica Parker
Weather Underground Forecast for Friday, May 25, 2012.

Expect more active weather to develop across the Great Lakes on Friday, as a low pressure system moves from the Upper Midwest into eastern Canada. This system will push a cold front over the Great Lakes and Midwest, producing scattered showers and thunderstorms throughout the day. There is a slight chance that some of these storms will turn severe with strong winds and large hail. Rainfall totals will range from 1 to 2 inches, with over 2 inches likely in areas of severe weather development.

Behind this activity in the West, a low pressure system will move over the Great Basin and into the Southern Rockies. Flow around this system will produce cooler temperatures across the West, while also triggering scattered showers over the Pacific Northwest, northern California, and Intermountain West. Snow showers may develop again across the highest elevations of the Northern Rockies.

Meanwhile in the East, high pressure builds from the Plains, over the Mississippi River Valley, and into the Eastern US. This will keep moisture away to the north, allowing for dry, sunny, and warm conditions. High temperatures will range in the 80s and 90s from the Central Plains through the Eastern Valleys, with parts of the Southern US reaching into the lower 100s.
Weather Underground Forecast for Friday, May 25, 2012.

Expect more active weather to develop across the Great Lakes on Friday, as a low pressure system moves from the Upper Midwest into eastern Canada. This system will push a cold front over the Great Lakes and Midwest, producing scattered showers and thunderstorms throughout the day. There is a slight chance that some of these storms will turn severe with strong winds and large hail. Rainfall totals will range from 1 to 2 inches, with over 2 inches likely in areas of severe weather development.

Behind this activity in the West, a low pressure system will move over the Great Basin and into the Southern Rockies. Flow around this system will produce cooler temperatures across the West, while also triggering scattered showers over the Pacific Northwest, northern California, and Intermountain West. Snow showers may develop again across the highest elevations of the Northern Rockies.

Meanwhile in the East, high pressure builds from the Plains, over the Mississippi River Valley, and into the Eastern US. This will keep moisture away to the north, allowing for dry, sunny, and warm conditions. High temperatures will range in the 80s and 90s from the Central Plains through the Eastern Valleys, with parts of the Southern US reaching into the lower 100s.
Weather Underground Broadcast Network

Sunnyvale Weather at a Glance

Updated 5:50 AM PDT
Elevation
70 ft
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Now
Clear
Clear
Temperature
50.5 °F
Feels Like 50.5 °F
Wind(mph)
0.0
Sunrise / Set
5:51 AM
8:18 PM
Moon
Waxing Crescent
Today
Thunderstorm 68 °F
T-storms
20% chance of precipitation
Tonight
Thunderstorm 46 °F
T-storms
20% chance of precipitation
Tomorrow
Partly Cloudy 72 | 48 °F
Partly Cloudy
Sunday
Partly Cloudy 75 | 50 °F
Partly Cloudy
Monday
Partly Cloudy 73 | 50 °F
Partly Cloudy
Tuesday
Partly Cloudy 73 | 46 °F
Partly Cloudy
Today is forecast to be Cooler than yesterday.
Conditions
Pressure
29.77 in
Visibility
10.0 miles
Clouds
Clear -
Moisture
Humidity
83%
Rainfall
-
Not available.
Snow Depth
Not available.
METAR
METAR KNUQ 251156Z AUTO 30010G18KT 10SM CLR 11/05 A2976 RMK AO2 RAB36E41 SLP080 P0000 60000 T01060050 10122 20106 58006 TSNO
Don't speak METAR? Read our FAQ.
Weather Radio
Launch Weather Radio
Temperature
Temperature
50.5 °F
Dew Point
-
Wind
Speed / Dir
Calm
Wind Gust
0.0 mph
Health
UV
0 out of 16
Pollen
6.50 out of 12
Pollen Forecast
PM2.5
Good
Flu Activity
Local Activity
View Flu Map
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Source: BestForecast
Descriptive Forecast
Friday
tstorms Partly cloudy with thunderstorms and a chance of rain. High of 68F. Breezy. Winds from the WNW at 20 to 25 mph. Chance of rain 20%.
Friday Night
nt_tstorms Partly cloudy with thunderstorms and a chance of rain. Low of 46F. Winds from the West at 5 to 10 mph. Chance of rain 20%.
Saturday
partlycloudy Partly cloudy. High of 72F. Winds from the West at 5 to 15 mph.
Saturday Night
nt_partlycloudy Partly cloudy. Low of 48F. Winds from the WNW at 5 to 15 mph.
Sunday
partlycloudy Partly cloudy in the morning, then clear. High of 75F. Winds from the WNW at 5 to 15 mph.
Sunday Night
nt_partlycloudy Partly cloudy. Fog overnight. Low of 50F. Winds from the WNW at 5 to 10 mph.
Monday
partlycloudy Clear. High of 73F. Winds from the WNW at 5 to 15 mph.
Monday Night
nt_clear Partly cloudy. Fog overnight. Low of 50F. Winds from the WNW at 5 to 10 mph.
Tuesday
partlycloudy Clear. High of 73F. Winds from the WNW at 5 to 15 mph.
Tuesday Night
nt_partlycloudy Partly cloudy. Low of 46F. Winds from the WNW at 5 to 10 mph.
Wednesday
partlycloudy Clear. High of 77F. Winds from the WNW at 5 to 10 mph.
Wednesday Night
nt_clear Clear. Low of 55F. Winds less than 5 mph.
Thursday
clear Clear. High of 81F. Winds from the WNW at 5 to 10 mph.
Thursday Night
nt_clear Clear. Low of 54F. Winds less than 5 mph.
Friday
clear Clear. High of 79F. Winds from the West at 5 to 10 mph.
Friday Night
nt_clear Clear. Low of 52F. Winds from the West at 5 to 15 mph.
Saturday
clear Clear. High of 77F. Winds from the West at 5 to 15 mph.
Saturday Night
nt_clear Clear. Low of 50F. Winds from the WNW at 5 to 15 mph.
Sunday
clear Clear. High of 75F. Winds from the WNW at 5 to 20 mph.
Sunday Night
nt_clear Clear. Low of 50F. Winds from the WNW at 5 to 15 mph.
Monday
clear Clear. High of 77F. Winds from the WNW at 5 to 15 mph.
Monday Night
nt_clear Clear. Low of 50F. Winds from the WNW at 5 to 15 mph.
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Forecast

View Calendar 10-Day Forecast for station KCASUNNY16

Friday, 25
Thunderstorm
68 | 46 °F
T-storms
Chance of
Precipitation
20%
Saturday, 26
Partly Cloudy
72 | 48 °F
Partly Cloudy
Chance of
Precipitation
0%
Sunday, 27
Partly Cloudy
75 | 50 °F
Partly Cloudy
Chance of
Precipitation
0%
Monday, 28
Partly Cloudy
73 | 50 °F
Partly Cloudy
Chance of
Precipitation
0%
Tuesday, 29
Partly Cloudy
73 | 46 °F
Partly Cloudy
Chance of
Precipitation
0%
Wednesday, 30
Partly Cloudy
77 | 55 °F
Partly Cloudy
Chance of
Precipitation
0%
Thursday, 31
Clear
81 | 54 °F
Clear
Chance of
Precipitation
0%
Friday, 1
Clear
79 | 52 °F
Clear
Chance of
Precipitation
0%
Saturday, 2
Clear
77 | 50 °F
Clear
Chance of
Precipitation
0%
Sunday, 3
Clear
75 | 50 °F
Clear
Chance of
Precipitation
0%
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Friday
tstorms Partly cloudy with thunderstorms and a chance of rain. High of 68F. Breezy. Winds from the WNW at 20 to 25 mph. Chance of rain 20%.
Friday Night
nt_tstorms Partly cloudy with thunderstorms and a chance of rain. Low of 46F. Winds from the West at 5 to 10 mph. Chance of rain 20%.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 49 | 44 63 | 48 60 | 47 54 | 48
Wind 19 mph WNW 21 mph WNW 13 mph WNW 7 mph WSW
Humidity 81% 59% 63% 82%
Chance of Precip. 20% 20% 20% 10%
Cloud Cover 58% 62% 67% 36%
Conditions Chance of Rain Thunderstorm Thunderstorm Partly Cloudy
Sunrise & Sunset
5:51 AM
8:18 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [2.56], Average RMSE [1.80]
The National Weather Service forecast quality is good. MaxT RMSE [1.82], Average RMSE [1.46] : Use NWS
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Saturday
partlycloudy Partly cloudy. High of 72F. Winds from the West at 5 to 15 mph.
Saturday Night
nt_partlycloudy Partly cloudy. Low of 48F. Winds from the WNW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 51 | 49 68 | 56 62 | 50 53 | 50
Wind 3 mph West 8 mph West 11 mph WNW 5 mph WNW
Humidity 88% 64% 63% 90%
Chance of Precip. 10% 0% 0% 0%
Cloud Cover 54% 36% 34% 58%
Conditions Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy
Sunrise & Sunset
5:51 AM
8:19 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [3.09], Average RMSE [2.48]
The National Weather Service forecast quality is good. MaxT RMSE [2.27], Average RMSE [1.64] : Use NWS
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Sunday
partlycloudy Partly cloudy in the morning, then clear. High of 75F. Winds from the WNW at 5 to 15 mph.
Sunday Night
nt_partlycloudy Partly cloudy. Fog overnight. Low of 50F. Winds from the WNW at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 50 | 46 67 | 51 69 | 49 55 | 49
Wind 2 mph West 7 mph WNW 10 mph NW 6 mph WNW
Humidity 84% 55% 50% 81%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 56% 13% 18% 1%
Conditions Partly Cloudy Clear Clear Clear
Sunrise & Sunset
5:50 AM
8:20 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [3.25], Average RMSE [2.62]
The National Weather Service forecast quality is good. MaxT RMSE [2.24], Average RMSE [1.79] : Use NWS
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Monday
partlycloudy Clear. High of 73F. Winds from the WNW at 5 to 15 mph.
Monday Night
nt_clear Partly cloudy. Fog overnight. Low of 50F. Winds from the WNW at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 51 | 45 67 | 54 67 | 55 53 | 48
Wind 6 mph WNW 10 mph WNW 11 mph WNW 6 mph WNW
Humidity 82% 62% 65% 84%
Chance of Precip. 10% 10% 0% 0%
Cloud Cover 56% 0% 0% 2%
Conditions Fog Clear Clear Clear
Sunrise & Sunset
5:50 AM
8:20 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [3.66], Average RMSE [3.08]
The National Weather Service forecast quality is fair. MaxT RMSE [2.74], Average RMSE [1.84] : Use NWS
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Tuesday
partlycloudy Clear. High of 73F. Winds from the WNW at 5 to 15 mph.
Tuesday Night
nt_partlycloudy Partly cloudy. Low of 46F. Winds from the WNW at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 51 | 47 67 | 52 69 | 53 54 | 47
Wind 5 mph WNW 8 mph WNW 10 mph WNW 5 mph WNW
Humidity 83% 56% 56% 75%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 11% 1% 0% 0%
Conditions Fog Clear Clear Clear
Sunrise & Sunset
5:49 AM
8:21 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [5.00], Average RMSE [2.34]
The National Weather Service forecast quality is fair. MaxT RMSE [3.13], Average RMSE [1.90] : Use NWS
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Wednesday
partlycloudy Clear. High of 77F. Winds from the WNW at 5 to 10 mph.
Wednesday Night
nt_clear Clear. Low of 55F. Winds less than 5 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 52 | 47 72 | 54 70 | 54 58 | 49
Wind 4 mph WNW 8 mph WNW 9 mph WNW 4 mph WNW
Humidity 83% 52% 54% 76%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 76% 0% 0% 0%
Conditions Mostly Cloudy Clear Clear Clear
Sunrise & Sunset
5:49 AM
8:21 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [5.11], Average RMSE [2.61]
The National Weather Service forecast quality is poor. MaxT RMSE [3.91], Average RMSE [2.15] : Use NWS
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Thursday
clear Clear. High of 81F. Winds from the WNW at 5 to 10 mph.
Thursday Night
nt_clear Clear. Low of 54F. Winds less than 5 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 56 | 52 74 | 54 73 | 52 60 | 54
Wind 2 mph West 7 mph WNW 9 mph WNW 3 mph WNW
Humidity 84% 48% 48% 78%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 0% 0% 0% 0%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:49 AM
8:21 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [5.15], Average RMSE [2.31]
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Friday
clear Clear. High of 79F. Winds from the West at 5 to 10 mph.
Friday Night
nt_clear Clear. Low of 52F. Winds from the West at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 56 | 51 74 | 55 72 | 56 59 | 51
Wind 3 mph West 6 mph West 10 mph West 7 mph West
Humidity 83% 52% 56% 77%
Chance of Precip. 0% 0% 0% 10%
Cloud Cover 0% 3% 2% 6%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:49 AM
8:21 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.04], Average RMSE [2.21]
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Saturday
clear Clear. High of 77F. Winds from the West at 5 to 15 mph.
Saturday Night
nt_clear Clear. Low of 50F. Winds from the WNW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 54 | 50 70 | 54 70 | 53 57 | 50
Wind 6 mph West 8 mph WNW 12 mph WNW 8 mph WNW
Humidity 87% 53% 55% 80%
Chance of Precip. 10% 0% 0% 0%
Cloud Cover 8% 8% 8% 6%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:49 AM
8:21 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [3.78], Average RMSE [2.06]
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Sunday
clear Clear. High of 75F. Winds from the WNW at 5 to 20 mph.
Sunday Night
nt_clear Clear. Low of 50F. Winds from the WNW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 52 | 47 70 | 60 69 | 53 57 | 47
Wind 7 mph WNW 9 mph WNW 15 mph WNW 10 mph WNW
Humidity 85% 70% 59% 71%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 4% 2% 1% 1%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:49 AM
8:21 PM
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Monday
clear Clear. High of 77F. Winds from the WNW at 5 to 15 mph.
Monday Night
nt_clear Clear. Low of 50F. Winds from the WNW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 56 | 50 71 | 59 71 | 55 57 | 47
Wind 7 mph WNW 9 mph WNW 14 mph WNW 8 mph WNW
Humidity 80% 66% 57% 71%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 1% 1% 1% %
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:49 AM
8:21 PM
Scientific Forecaster Discussion — MOS Weather Graph
Nearby
History & Almanac
May 25, 2012 Max Temp Min Temp
Normal (KNUQ) 71 °F 53 °F
Record (KNUQ) 93 °F (1951) 44 °F (1980)
Yesterday 70 °F 52 °F
Yesterday's Heating Degree Days: 4
Choose a date
Earthquake Activity
City Distance Mag. Time & Date
No recent earthquake activity has been reported nearby.
Minimum magnitude displayed is 2.5.
More information at USGS.gov
Air Quality
  Air Quality AQ Index Pollutant
Yesterday Good
OZONE
Yesterday Good
PM2.5
Current Good
PM2.5
Friday Good
OZONE
Saturday Good
OZONE
Sunday Good
OZONE
Monday Good
OZONE
Tuesday Good
OZONE
Coastal Water Temperatures
Place Temperature
San Francisco, CA 52.0 °F
Port Chicago, CA 63.0 °F
Marine Forecast
Astronomy
May. 25, 2012 Rise Set
Actual Time 5:51 AM PDT 8:18 PM PDT
Civil Twilight 5:21 AM PDT 8:48 PM PDT
Nautical Twilight 4:44 AM PDT 9:26 PM PDT
Astronomical Twilight 4:03 AM PDT 10:07 PM PDT
Moon 9:55 AM PDT 11:59 PM PDT
Length Of Visible Light 15h 26m
Length of Day
14h 26m
Tomorrow will be 1m 17s longer.
Waxing Crescent, 18% of the Moon is Illuminated
Today
Waxing Crescent
May 28
First Quarter
Jun 4
Full
Jun 11
Last Quarter
Jun 19
New
Visit Astronomy
Today's Extremes
State Highs State Lows
82 °F
Needles
75 °F
Blythe
72 °F
Palm Springs
72 °F
Thermal
71 °F
Twentynine Palms
32 °F
Truckee-Tahoe
32 °F
Weaverville
33 °F
Blue Canyon
35 °F
Alturas
35 °F
Mount Shasta
Record Extremes
Snow Depth
Station Depth Elevation
Blue Lakes 0 in 8000 ft
Forestdale Creek 1 in 8029 ft
Leavitt Lake 19 in 9400 ft
Ebbetts Pass 0 in 8700 ft
Sonora Pass 0 in 8800 ft
Snow Depth Reports — Snow Depth Map
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Travel Planning
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Nearby Events
Event Date Forecast
Stanford Cardinal vs. California Golden Bears 5:00 PM PDT 2012-05-25 Thunderstorm, 63°F
Ballet San Jose Nutcracker 7:00 PM PDT 2012-05-25 Thunderstorm, 59°F
Wonderful World By Richard Dresser 8:00 PM PDT 2012-05-25 Thunderstorm, 57°F
Downtown Santa Cruz Food Tours for March - November 2012 2:00 PM PDT 2012-05-25 Thunderstorm, 59°F
Cinderella 10:00 AM PDT 2012-05-25 Chance of Rain, 54°F
Cinderella 7:00 PM PDT 2012-05-25 Thunderstorm, 59°F
Event data courtesy eviesays.com
Aviation
City Temp. Conditions Updated
Moffett NAS 51 °F Clear 4:56 AM PDT
San Jose 50 °F Scattered Clouds 5:31 AM PDT
Palo Alto This station is not reporting.
San Jose Reid This station is not reporting.
View all Aviation Tools
Flight To ETA Status
No flights were found.
Flight Tracker by FlightAware FlightAware
View U.S. Airport Delays
Type Condition
Flight Rule: VFR (KNUQ)
Wind Speed: 10.0 kts.
Wind Dir: 320° (NW)
Ceiling: Unlimited

METAR KNUQ 251156Z AUTO 30010G18KT 10SM CLR 11/05 A2976 RMK AO2 RAB36E41 SLP080 P0000 60000 T01060050 10122 20106 58006 TSNO

View all Reports & Maps
Sports
Event Date Forecast
Royals vs. Orioles 7:05 PM EDT on May 25, 2012 Clear, 79 °F
Cubs vs. Pirates 7:05 PM EDT on May 25, 2012 Chance of a Thunderstorm, 81 °F
Event Date Forecast
Athletic vs. Barcelona 12:00 PM CEST on May 25, 2012 Scattered Clouds, High 86° F/ 30° C
Barcelona vs. Athletic 10:00 PM CEST on May 25, 2012 Scattered Clouds, High 86° F/ 30° C
Los Angeles vs. San Jose 7:00 PM PDT on June 30, 2012 Average High 81° F/ 27° C
Real Salt Lake vs. San Jose 7:30 PM PDT on July 14, 2012 Average High 84° F/ 28° C
Event Date Forecast
Coca-Cola 600 6:16 PM EDT on May 27, 2012 Chance of a Thunderstorm, 81 °F
FedEx 400 benefiting Autism Speaks 1:15 PM EDT on June 03, 2012 Average High 79° F/ 26° C
Event Date Forecast
Crowne Plaza Invitational at Colonial 8:30 AM CDT on May 25, 2012 Overcast, 74 °F
Crowne Plaza Invitational at Colonial 8:30 AM CDT on May 26, 2012 Mostly Cloudy, 72 °F
View all Sports Weather
Weather Stations
Station Location Temp. Windchill Dew Point Humidity Wind Precipitation Elevation Updated Type Website
Sunnyvale - Jasmine, Sunnyvale, CA 50.5 °F - - 83% NW  at  0.0 mph 0.00 in / hr 70 ft 5:50 AM PDT Normal  
Sunnyvale, Sunnyvale, CA 50.9 °F - 37 °F 57% NE  at  6.0 mph 0.00 in / hr 60 ft 5:54 AM PDT Rapid Fire  
APRSWXNET Sunnyvale CA , Sunnyvale, CA 50 °F - 38 °F 64% NW  at  0 mph 0.00 in / hr 127 ft 5:30 AM PDT MADIS
Ortega Park, Sunnyvale, CA 49.5 °F 47 °F 38 °F 65% NW  at  5.8 mph 0.00 in / hr 118 ft 5:54 AM PDT Rapid Fire  
Homestead/Kennewick, Sunnyvale, CA 48.0 °F 45 °F 37 °F 66% North  at  7.0 mph 0.00 in / hr 225 ft 5:54 AM PDT Rapid Fire  
SW Sunnyvale, Sunnyvale, CA 49.4 °F 49 °F 41 °F 72% WNW  at  3.0 mph - / hr 500 ft 5:33 AM PDT Normal  
MotherShip, Mariani Orchard, Cupertino, CA 49.5 °F 50 °F 41 °F 73% South  at  0.7 mph 0.00 in / hr 232 ft 5:54 AM PDT Rapid Fire  
Sunnyvale, Sunnyvale, CA 49.1 °F 49 °F 39 °F 69% NW  at  1.0 mph 0.00 in / hr 330 ft 5:54 AM PDT Normal  
Birdland-Raynor, Sunnyvale, CA 48.5 °F 48 °F 38 °F 67% WNW  at  3.0 mph 0.00 in / hr 180 ft 5:54 AM PDT Rapid Fire  
Santa Clara - Lawrence & Monroe, Santa Clara, CA 50.5 °F - 41 °F 71% NW  at  6.0 mph 0.00 in / hr 88 ft 5:54 AM PDT Rapid Fire  
Cuesta Park, Mountain View, Mountain View, CA 52.0 °F - 38 °F 57% SSW  at  2.0 mph 0.00 in / hr 104 ft 5:54 AM PDT Rapid Fire  
Lawrence, Santa Clara, CA 49.5 °F 50 °F 42 °F 74% WNW  at  0.0 mph 0.00 in / hr 69 ft 5:53 AM PDT Normal  
Santa Clara, CA 49.7 °F 50 °F 41 °F 72% NW  at  2.0 mph 0.00 in / hr 12 ft 5:54 AM PDT Rapid Fire  
Loyola Corners, Los Altos, CA 49.3 °F 49 °F 41 °F 73% NNW  at  1.0 mph 0.00 in / hr 157 ft 5:54 AM PDT Rapid Fire  
Monta Vista North, Cupertino, CA 49.5 °F 50 °F 35 °F 58% WNW  at  0.5 mph 0.00 in / hr 340 ft 5:54 AM PDT Normal  
Mountain View, CA 51.4 °F - - - North  at  - - / hr 50 ft 5:53 AM PDT Normal  
Mountain Shadows, Mountain View, CA 49.8 °F 49 °F 38 °F 65% WNW  at  4.0 mph 0.00 in / hr 50 ft 5:54 AM PDT Normal  
Monta Vista, Cupertino, CA 49.2 °F 49 °F 38 °F 66% NW  at  2.0 mph 0.00 in / hr 300 ft 5:45 AM PDT Normal
Monta Vista, Cupertino, CA 50.4 °F - 41 °F 71% NE  at  1.6 mph 0.00 in / hr 300 ft 5:53 AM PDT Rapid Fire  
Mountain View, Mountain View, CA 51.4 °F - 38 °F 60% SSW  at  0.0 mph 0.00 in / hr 10 ft 5:50 AM PDT Normal  
Los Altos, CA 49.6 °F 50 °F 40 °F 68% NNW  at  0.0 mph 0.00 in / hr 100 ft 5:50 AM PDT Normal  
APRSWXNET Santa Clara CA , Santa Clara, CA 49 °F 49 °F 40 °F 71% WNW  at  3 mph 0.00 in / hr 116 ft 5:11 AM PDT MADIS
Los Altos Country Club, Los Altos, CA 50.0 °F - 43 °F 77% South  at  0.0 mph - / hr 292 ft 5:30 AM PDT Normal  
Monta Vista, Cupertino, CA 48.7 °F 49 °F 41 °F 74% NW  at  2.2 mph 0.00 in / hr 387 ft 5:44 AM PDT Normal  
Los Altos High School, Los Altos, CA 49.7 °F 50 °F 39 °F 67% NNW  at  3.0 mph 0.00 in / hr 140 ft 5:50 AM PDT Normal  
APRSWXNET Santa Clara CA , Santa Clara, CA 49 °F 49 °F 38 °F 66% West  at  0 mph 0.00 in / hr 137 ft 5:13 AM PDT MADIS
MLoma, Mountain View, CA 50.9 °F - 38 °F 61% North  at  3.4 mph 0.00 in / hr 30 ft 5:53 AM PDT Rapid Fire  
Near Montague School, Santa Clara, CA 50.0 °F 46 °F 41 °F 72% West  at  9.6 mph 0.00 in / hr 20 ft 5:54 AM PDT Rapid Fire  
Los Altos Hills, CA 51.0 °F - 47 °F 86% NW  at  9.6 mph 0.00 in / hr 96 ft 5:50 AM PDT Normal  
Saratoga Ave./Doyle Rd., San Jose, CA 49.7 °F 49 °F 37 °F 62% WNW  at  3.8 mph 0.00 in / hr 190 ft 5:51 AM PDT Normal  
Walnut Grove, Palo Alto, CA 50.5 °F - 43 °F 76% North  at  1.0 mph 0.00 in / hr 36 ft 5:50 AM PDT Normal  
WESTWIND VINEYARDS, LOS ALTOS HILLS, CA 49.5 °F 49 °F 41 °F 72% West  at  3.1 mph 0.00 in / hr 348 ft 5:51 AM PDT Rapid Fire  
Los Altos Hills, Los Altos Hills, CA 47.9 °F 48 °F 40 °F 75% North  at  3.0 mph 0.00 in / hr 650 ft 5:53 AM PDT Rapid Fire  
Palo Verde, Palo Alto, CA 49.7 °F 49 °F 43 °F 77% WNW  at  4.0 mph 0.00 in / hr 12 ft 1:54 AM WST Rapid Fire  
RAWS LOS ALTOS CA, Los Altos, CA 48 °F 45 °F 38 °F 68% NW  at  6 mph 0.00 in / hr 539 ft 5:10 AM PDT MADIS
APRSWXNET Saratoga CA , San Jose, CA 50 °F - 38 °F 64% WNW  at  2 mph 0.00 in / hr 286 ft 5:10 AM PDT MADIS
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Special Statement
Mobile & Email Alerts Statement as of 10:01 PM PDT on May 24, 2012

... Much cooler with a chance of showers and isolated thunderstorms Friday...

An unseasonably cold weather system will rapidly approach the Bay
area overnight... arriving by Friday morning. Rain showers
currently associated with this system are being reported in
southern Oregon with radars west of Cape Mendocino starting to
pick up returns. The main impact of the system will be cool
temperatures and a continuation of the breezy to locally windy
weather we've been having the last few days.

Skies will start out sunny but with cold morning temperatures in
the upper 30s and 40s for many portions of the Bay area. By
mid-morning the core of the system will pass overhead with very
unstable air aloft. This will allow for cumulus cloud development
over the hills of the Bay area. Rain showers will be possible
through the afternoon hours... especially over the hills but its
possible that any showers could drift over the valleys. Anybody
with outdoor interests such as camping our hiking on Friday should
be prepared for unseasonably cool... possibly wet and windy weather.

Finally... the latest computer model projections have been
consistent in showing an above average chance of thunderstorms
over the far eastern portions of our district... roughly running
southward form the hills of Napa County through the far East Bay
valleys and continuing southward over the higher and mostly
unpopulated areas of Santa Clara and San Benito counties. These
far eastern counties of the Bay area will have the best chance for
seeing thunderstorms roughly from 2 PM to 7 PM Friday afternoon
and evening. Freezing levels will drop to around 6000 feet so ice
pellets and small hail will be possible in some of the heavier
cells along with dangerous cloud to ground lightning.

Any hail that falls on roads can quickly lead to traffic
accidents... especially on the get away Friday of a three day
Holiday weekend. The National Weather Service and California
Highway patrol urge motorists to slow down and stay abreast of the
latest forecast information before heading out this Holiday
weekend. As a reminder... folks heading to the Sierra should expect
winter weather conditions Friday night into Saturday with snow
over the trans-Sierra passes. There are currently snow advisories
in effect for that West Slope of the Sierra until 6 PM Friday.

Http://weather.Gov/sanfrancisco


R walbrun