Portola Valley, CA

2:29 AM PDT on May 25, 2012 (GMT -0700)
Elev: 610 ft
Lon: 122.2° 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

Portola Valley Weather at a Glance

Updated 2:20 AM PDT
Elevation
660 ft
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Now
Overcast
Overcast
Temperature
47.4 °F
Feels Like 47 °F
Wind(mph)
1.0
Sunrise / Set
5:52 AM
8:19 PM
Moon
Waxing Crescent
Tonight
Clear 48 °F
Clear
Friday
Thunderstorm 63 °F
T-storms
20% chance of precipitation
Friday Night
Thunderstorm 50 °F
T-storms
20% chance of precipitation
Saturday
Partly Cloudy 70 | 48 °F
Partly Cloudy
Sunday
Partly Cloudy 72 | 48 °F
Partly Cloudy
Monday
Partly Cloudy 68 | 45 °F
Partly Cloudy
Today is forecast to be Cooler than yesterday.
Conditions
Pressure
29.78 in
Visibility
10.0 miles
Clouds
Clear -
Moisture
Humidity
72%
Rainfall
0.00 in
Snow Depth
Not available.
METAR
METAR KNUQ 250856Z AUTO 27013G18KT 10SM -RA CLR 11/05 A2978 RMK AO2 RAB20 SLP085 P0000 60000 T01110050 58012 TSNO
Don't speak METAR? Read our FAQ.
Weather Radio
Launch Weather Radio
Temperature
Windchill
47 °F
Dew Point
39 °F
Wind
Speed / Dir
1.0 mph from WNW
Wind Gust
11.0 mph
Health
UV
0 out of 16
Pollen
6.40 out of 12
Pollen Forecast
Ozone
Good
PM2.5
Good
Flu Activity
Local Activity
View Flu Map
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Source: BestForecast
Descriptive Forecast
Friday
tstorms Mostly cloudy with thunderstorms and a chance of rain. High of 63F. 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 50F. Winds from the WSW at 5 to 10 mph. Chance of rain 20%.
Saturday
partlycloudy Overcast in the morning, then partly cloudy. High of 70F. Winds from the West at 5 to 15 mph.
Saturday Night
nt_partlycloudy Partly cloudy. Low of 48F. Winds from the West at 5 to 15 mph.
Sunday
partlycloudy Mostly cloudy in the morning, then partly cloudy. High of 72F. Winds from the WNW at 5 to 15 mph.
Sunday Night
nt_clear Partly cloudy in the evening, then mostly cloudy. Low of 48F. Winds from the WNW at 5 to 10 mph.
Monday
partlycloudy Partly cloudy. High of 68F. Winds from the West at 5 to 15 mph.
Monday Night
nt_clear Partly cloudy. Fog overnight. Low of 45F. Winds from the WNW at 5 to 10 mph.
Tuesday
partlycloudy Mostly cloudy in the morning, then partly cloudy. High of 70F. Winds from the WNW at 5 to 10 mph.
Tuesday Night
nt_clear Clear. Low of 46F. Winds from the WNW at 5 to 10 mph.
Wednesday
partlycloudy Partly cloudy. High of 72F. Winds from the West at 5 to 10 mph.
Wednesday Night
nt_clear Clear. Low of 50F. Winds less than 5 mph.
Thursday
clear Clear. High of 79F. Winds from the West at 5 to 10 mph.
Thursday Night
nt_clear Clear. Low of 52F. Winds less than 5 mph.
Friday
clear Partly cloudy. High of 75F. Winds from the WSW at 5 to 10 mph.
Friday Night
nt_clear Clear. Low of 52F. Winds from the West at 5 to 15 mph.
Saturday
partlycloudy Partly cloudy. High of 72F. Winds from the West at 5 to 15 mph.
Saturday Night
nt_clear Partly cloudy. Low of 50F. Winds from the WNW at 5 to 15 mph.
Sunday
clear Clear. High of 70F. 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 72F. 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 KPAO

Friday, 25
Thunderstorm
63 | 50 °F
T-storms
Chance of
Precipitation
20%
Saturday, 26
Partly Cloudy
70 | 48 °F
Partly Cloudy
Chance of
Precipitation
0%
Sunday, 27
Partly Cloudy
72 | 48 °F
Partly Cloudy
Chance of
Precipitation
0%
Monday, 28
Partly Cloudy
68 | 45 °F
Partly Cloudy
Chance of
Precipitation
0%
Tuesday, 29
Partly Cloudy
70 | 46 °F
Partly Cloudy
Chance of
Precipitation
0%
Wednesday, 30
Partly Cloudy
72 | 50 °F
Partly Cloudy
Chance of
Precipitation
0%
Thursday, 31
Clear
79 | 52 °F
Clear
Chance of
Precipitation
0%
Friday, 1
Clear
75 | 52 °F
Clear
Chance of
Precipitation
0%
Saturday, 2
Partly Cloudy
72 | 50 °F
Partly Cloudy
Chance of
Precipitation
0%
Sunday, 3
Clear
70 | 50 °F
Clear
Chance of
Precipitation
0%
Source: BestForecast at 1:01 AM PDT on May 25, 2012
Descriptive Forecast
Friday
tstorms Mostly cloudy with thunderstorms and a chance of rain. High of 63F. 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 50F. Winds from the WSW at 5 to 10 mph. Chance of rain 20%.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 50 | 43 59 | 45 61 | 49 54 | 49
Wind 18 mph WNW 20 mph NW 14 mph WNW 3 mph SSW
Humidity 79% 58% 66% 82%
Chance of Precip. 20% 20% 20% 10%
Cloud Cover 56% 82% 67% 68%
Conditions Chance of Rain Thunderstorm Thunderstorm Mostly Cloudy
Sunrise & Sunset
5:52 AM
8:19 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [3.08], Average RMSE [2.08]
The National Weather Service forecast quality is poor. MaxT RMSE [3.52], Average RMSE [2.65] : Use NWS
Source: BestForecast at 1:01 AM PDT on May 25, 2012
Descriptive Forecast
Saturday
partlycloudy Overcast in the morning, then partly cloudy. High of 70F. Winds from the West at 5 to 15 mph.
Saturday Night
nt_partlycloudy Partly cloudy. Low of 48F. Winds from the West at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 52 | 49 66 | 60 59 | 51 53 | 48
Wind 4 mph SW 8 mph WNW 11 mph WNW 5 mph WSW
Humidity 90% 79% 72% 84%
Chance of Precip. 10% 10% 0% 0%
Cloud Cover 53% 100% 23% 26%
Conditions Partly Cloudy Overcast Clear Partly Cloudy
Sunrise & Sunset
5:52 AM
8:20 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.01], Average RMSE [1.93]
The National Weather Service forecast quality is poor. MaxT RMSE [3.59], Average RMSE [2.52] : Use NWS
Source: BestForecast at 1:01 AM PDT on May 25, 2012
Descriptive Forecast
Sunday
partlycloudy Mostly cloudy in the morning, then partly cloudy. High of 72F. Winds from the WNW at 5 to 15 mph.
Sunday Night
nt_clear Partly cloudy in the evening, then mostly cloudy. Low of 48F. Winds from the WNW at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 50 | 48 65 | 51 66 | 49 49 | 47
Wind 3 mph WSW 9 mph NW 10 mph NW 6 mph WNW
Humidity 90% 62% 54% 94%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 56% 54% 0% 29%
Conditions Partly Cloudy Partly Cloudy Clear Partly Cloudy
Sunrise & Sunset
5:51 AM
8:20 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.36], Average RMSE [2.42]
The National Weather Service forecast quality is fair. MaxT RMSE [3.39], Average RMSE [4.31] : Use NWS
Source: BestForecast at 1:01 AM PDT on May 25, 2012
Descriptive Forecast
Monday
partlycloudy Partly cloudy. High of 68F. Winds from the West at 5 to 15 mph.
Monday Night
nt_clear Partly cloudy. Fog overnight. Low of 45F. Winds from the WNW at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 50 | 47 65 | 51 65 | 55 47 | 44
Wind 6 mph WNW 10 mph WNW 11 mph West 6 mph West
Humidity 90% 63% 69% 91%
Chance of Precip. 10% 10% 0% 0%
Cloud Cover 75% 51% 19% 21%
Conditions Mostly Cloudy Partly Cloudy Clear Clear
Sunrise & Sunset
5:51 AM
8:21 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.26], Average RMSE [2.52]
The National Weather Service forecast quality is poor. MaxT RMSE [3.68], Average RMSE [4.45] : Use NWS
Source: BestForecast at 1:01 AM PDT on May 25, 2012
Descriptive Forecast
Tuesday
partlycloudy Mostly cloudy in the morning, then partly cloudy. High of 70F. Winds from the WNW at 5 to 10 mph.
Tuesday Night
nt_clear Clear. Low of 46F. Winds from the WNW at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 48 | 43 63 | 46 66 | 53 47 | 46
Wind 5 mph WNW 7 mph West 9 mph West 5 mph WNW
Humidity 86% 55% 61% 89%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 41% 32% 10% 15%
Conditions Fog Partly Cloudy Clear Clear
Sunrise & Sunset
5:50 AM
8:22 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.85], Average RMSE [3.07]
The National Weather Service forecast quality is poor. MaxT RMSE [4.05], Average RMSE [4.66] : Use NWS
Source: BestForecast at 1:01 AM PDT on May 25, 2012
Descriptive Forecast
Wednesday
partlycloudy Partly cloudy. High of 72F. Winds from the West at 5 to 10 mph.
Wednesday Night
nt_clear Clear. Low of 50F. Winds less than 5 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 50 | 45 67 | 52 68 | 53 51 | 47
Wind 4 mph WNW 7 mph WNW 9 mph West 4 mph West
Humidity 83% 59% 59% 85%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 37% 27% 15% 24%
Conditions Partly Cloudy Partly Cloudy Clear Clear
Sunrise & Sunset
5:50 AM
8:22 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [6.68], Average RMSE [2.97]
The National Weather Service forecast quality is poor. MaxT RMSE [4.35], Average RMSE [4.82] : Use NWS
Source: BestForecast at 1:01 AM PDT on May 25, 2012
Descriptive Forecast
Thursday
clear Clear. High of 79F. Winds from the West at 5 to 10 mph.
Thursday Night
nt_clear Clear. Low of 52F. Winds less than 5 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 53 | 47 68 | 52 74 | 54 55 | 51
Wind 2 mph WSW 6 mph WNW 8 mph West 3 mph West
Humidity 81% 55% 51% 85%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 0% 12% 7% 21%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:50 AM
8:22 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [5.49], Average RMSE [3.57]
Source: BestForecast at 1:01 AM PDT on May 25, 2012
Descriptive Forecast
Friday
clear Partly cloudy. High of 75F. Winds from the WSW 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 54 | 49 68 | 54 71 | 57 55 | 48
Wind 3 mph WSW 6 mph WSW 9 mph West 8 mph West
Humidity 83% 60% 61% 77%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 0% 30% 16% 21%
Conditions Clear Partly Cloudy Clear Clear
Sunrise & Sunset
5:50 AM
8:22 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.47], Average RMSE [3.46]
Source: BestForecast at 1:01 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_clear Partly cloudy. Low of 50F. Winds from the WNW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 54 | 51 66 | 54 67 | 53 53 | 46
Wind 6 mph West 8 mph West 13 mph West 9 mph WNW
Humidity 87% 64% 61% 77%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 6% 40% 19% 28%
Conditions Clear Partly Cloudy Clear Partly Cloudy
Sunrise & Sunset
5:50 AM
8:22 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.80], Average RMSE [2.17]
Source: BestForecast at 1:01 AM PDT on May 25, 2012
Descriptive Forecast
Sunday
clear Clear. High of 70F. 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 65 | 55 65 | 52 53 | 45
Wind 7 mph WNW 9 mph WNW 15 mph WNW 10 mph WNW
Humidity 86% 70% 59% 71%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 4% 2% 0% 1%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:50 AM
8:22 PM
Source: BestForecast at 1:01 AM PDT on May 25, 2012
Descriptive Forecast
Monday
clear Clear. High of 72F. 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 52 | 46 65 | 53 66 | 51 53 | 45
Wind 8 mph WNW 9 mph WNW 14 mph WNW 9 mph WNW
Humidity 80% 66% 56% 71%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 1% 1% 1% %
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:50 AM
8:22 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
OZONE
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 54.0 °F
Richmond, CA 57.9 °F
Port Chicago, CA 64.0 °F
Marine Forecast
Astronomy
May. 25, 2012 Rise Set
Actual Time 5:52 AM PDT 8:19 PM PDT
Civil Twilight 5:22 AM PDT 8:49 PM PDT
Nautical Twilight 4:45 AM PDT 9:26 PM PDT
Astronomical Twilight 4:04 AM PDT 10:07 PM PDT
Moon 9:55 AM PDT No Moon Set
Length Of Visible Light 15h 26m
Length of Day
14h 26m
Tomorrow will be 1m 16s longer.
Waxing Crescent, 17% 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
35 °F
Weaverville
36 °F
Mount Shasta
37 °F
Alturas
39 °F
South Lake Tahoe
Record Extremes
Snow Depth
Station Depth Elevation
Blue Lakes 0 in 8000 ft
Carson Pass 0 in 8500 ft
Forestdale Creek 1 in 8029 ft
Leavitt Lake 19 in 9400 ft
Ebbetts Pass 0 in 8700 ft
Snow Depth Reports — Snow Depth Map
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Travel & Activities
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
Wonderful World By Richard Dresser 8:00 PM PDT 2012-05-25 Thunderstorm, 57°F
Gypsy Tribe 9:00 PM PDT 2012-05-25 Thunderstorm, 56°F
Fanny Retsek, Drawings and Prints 9:00 AM PDT 2012-05-25 Chance of Rain, 56°F
Monterey Age Group Open Meet 7:00 AM PDT 2012-05-25 Chance of Rain, 52°F
New Member Orientation 6:00 PM PDT 2012-05-25 Thunderstorm, 61°F
Event data courtesy eviesays.com
Aviation
City Temp. Conditions Updated
Palo Alto This station is not reporting.
Moffett NAS 52 °F Light Rain 1:56 AM PDT
San Carlos 50 °F Partly Cloudy 2:10 AM PDT
San Jose 51 °F Clear 1:53 AM PDT
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: 13.0 kts.
Wind Dir: 288° (WNW)
Ceiling: Unlimited

METAR KNUQ 250856Z AUTO 27013G18KT 10SM -RA CLR 11/05 A2978 RMK AO2 RAB20 SLP085 P0000 60000 T01110050 58012 TSNO

View all Reports & Maps
Sports
Event Date Forecast
Royals vs. Orioles 7:05 PM EDT on May 25, 2012 Partly Cloudy, 81 °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, 85 °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
Central Portola Valley, Portola Valley, CA 47.4 °F 47 °F 39 °F 72% WNW  at  1.0 mph 0.00 in / hr 660 ft 2:20 AM PDT Normal
Portola Valley, Portola Valley, CA 55.9 °F - - - WSW  at  4.1 mph 0.00 in / hr 764 ft 2:29 AM PDT Normal  
Alpine Hills, Portola Valley, CA 48.9 °F 48 °F 41 °F 75% NW  at  3.8 mph 0.00 in / hr 690 ft 2:27 AM PDT Normal  
Skywood, Woodside, CA 43.9 °F 44 °F 38 °F 78% NW  at  0.0 mph 0.00 in / hr 1453 ft 2:20 AM PDT Normal  
APRSWXNET Los Altos Hills CA , Los Altos, CA 48 °F 48 °F 38 °F 68% North  at  2 mph 0.00 in / hr 62 ft 2:03 AM PDT MADIS
SLAC's Campus, Menlo Park, CA 50.2 °F - 26 °F 38% NNE  at  6.2 mph 0.00 in / hr 0 ft 2:29 AM PDT Rapid Fire  
Rapley Ranch, Woodside, CA 44.1 °F 42 °F 29 °F 55% SW  at  4.0 mph 0.00 in / hr 1600 ft 2:29 AM PDT Normal  
Langley Hill, Woodside, CA 43.0 °F 43 °F 40 °F 88% East  at  3.0 mph 0.00 in / hr 400 ft 2:15 AM PDT Normal  
Woodside, Woodside, CA 48.9 °F 49 °F 40 °F 72% WNW  at  1.0 mph 0.00 in / hr 375 ft 2:28 AM PDT Normal  
RAWS LOS ALTOS CA, Los Altos, CA 48 °F 47 °F 38 °F 67% West  at  4 mph 0.00 in / hr 539 ft 1:10 AM PDT MADIS
MesoWest Stanford University , Menlo Park, CA 50 °F - 42 °F 74% North  at  - 0.00 in / hr 118 ft 1:00 AM PDT MADIS
APRSWXNET W.Menlo Park CA, Menlo Park, CA 52 °F - 42 °F 68% NW  at  3 mph 0.00 in / hr 115 ft 2:00 AM PDT MADIS
APRSWXNET La Honda C, La Honda, CA 47 °F 45 °F 45 °F 92% NW  at  4 mph 0.00 in / hr 807 ft 1:58 AM PDT MADIS
WESTWIND VINEYARDS, LOS ALTOS HILLS, CA 50.0 °F 49 °F 40 °F 69% NE  at  4.5 mph 0.00 in / hr 348 ft 2:26 AM PDT Rapid Fire  
Cuesta La Honda, La Honda, CA 49.9 °F 50 °F 43 °F 78% SW  at  2.7 mph 2.59 in / hr 450 ft 2:29 AM PDT Rapid Fire
Cuesta La Honda, La Honda, CA 47.1 °F 44 °F 43 °F 84% West  at  6.0 mph 0.00 in / hr 697 ft 1:53 AM PDT Normal
Los Altos Hills, Los Altos Hills, CA 48.8 °F 49 °F 39 °F 68% West  at  1.0 mph 0.00 in / hr 650 ft 2:28 AM PDT Rapid Fire  
Cuesta La Honda, La Honda, CA 47.2 °F 47 °F 45 °F 93% WSW  at  2.4 mph 0.00 in / hr 862 ft 2:29 AM PDT Rapid Fire
Los Altos Hills, CA 51.7 °F - 47 °F 84% SW  at  5.1 mph 0.00 in / hr 96 ft 2:25 AM PDT Normal  
Woodside Glens, Woodside, CA 50.1 °F - 43 °F 76% ESE  at  1.0 mph 0.00 in / hr 381 ft 2:25 AM PDT Normal  
College Terrace, Palo Alto, CA 50.3 °F - 42 °F 74% WSW  at  1.0 mph 0.00 in / hr 43 ft 2:26 AM PDT Normal  
RAWS LA HONDA CA, La Honda, CA 47 °F 45 °F 43 °F 87% West  at  5 mph 0.00 in / hr 804 ft 1:07 AM PDT MADIS
Barron Park, Palo Alto, CA 49.3 °F 46 °F 40 °F 69% WSW  at  7.8 mph 0.00 in / hr 40 ft 2:29 AM PDT Rapid Fire  
Atherton, CA 50.5 °F - 42 °F 73% SSW  at  0.0 mph 0.00 in / hr 53 ft 2:25 AM PDT Normal  
Beresford Ave, Redwood City, CA 51.8 °F - 41 °F 69% NW  at  5.8 mph 0.00 in / hr 66 ft 2:27 AM PDT Normal
Alpine Road, La Honda, CA 43.4 °F 38 °F 41 °F 90% WNW  at  9.0 mph 0.00 in / hr 1594 ft 2:29 AM PDT Rapid Fire  
Evergreen Park, Palo Alto, CA 50.4 °F - 42 °F 72% North  at  0.0 mph 0.00 in / hr 35 ft 2:21 AM PDT Normal  
APRSWXNET Atherton CA , Atherton, CA 50 °F 48 °F 43 °F 77% NW  at  6 mph 0.00 in / hr 49 ft 2:02 AM PDT MADIS
Stulsaft Park, Redwood City, CA 50.8 °F - 41 °F 69% North  at  0.0 mph 0.00 in / hr 233 ft 2:29 AM PDT Rapid Fire  
Los Altos High School, Los Altos, CA 50.5 °F - 40 °F 66% WSW  at  7.0 mph 0.00 in / hr 140 ft 2:28 AM PDT Normal  
Old Palo Alto (Waverley St), Palo Alto, CA 50.1 °F - 41 °F 71% WNW  at  2.8 mph 0.00 in / hr 57 ft 2:29 AM PDT Rapid Fire
Los Altos, CA 50.7 °F - 40 °F 67% NNW  at  0.0 mph 0.00 in / hr 100 ft 2:25 AM PDT Normal  
Walnut Grove, Palo Alto, CA 51.2 °F - 44 °F 76% North  at  2.0 mph 0.00 in / hr 36 ft 2:25 AM PDT Normal  
Los Altos Country Club, Los Altos, CA 50.0 °F 48 °F 41 °F 72% ESE  at  4.7 mph - / hr 292 ft 2:29 AM PDT Normal  
Mountain View, Mountain View, CA 52.1 °F - 38 °F 59% WNW  at  0.0 mph 0.00 in / hr 10 ft 2:25 AM PDT Normal  
Sterling Heights, Redwood City, CA 49.8 °F 46 °F 20 °F 31% NW  at  9.0 mph 0.00 in / hr 134 ft 2:29 AM PDT Rapid Fire  
Lower Hillcrest, Emerald Hills, CA 48.1 °F 48 °F 41 °F 77% North  at  0.0 mph 0.00 in / hr 535 ft 2:29 AM PDT Rapid Fire  
Montebello Rd, Los Altos, CA 40.0 °F 32 °F 36 °F 86% NNW  at  14.0 mph 0.00 in / hr 2300 ft 2:29 AM PDT Rapid Fire  
Devil's Ridge, La Honda, CA 39.7 °F 33 °F 38 °F 95% WSW  at  11.0 mph 0.00 in / hr 2400 ft 2:26 AM PDT Normal  
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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