San Mateo, CA

2:59 AM PDT on May 25, 2012 (GMT -0700)
Elev: 7 ft
Lon: 122.3° W
Lat: 37.6° 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

San Mateo Weather at a Glance

Updated 2:59 AM PDT
Elevation
10 ft
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Now
Scattered Clouds
Scattered Clouds
Temperature
49.9 °F
Feels Like 46 °F
Wind(mph)
9.0
Sunrise / Set
5:52 AM
8:20 PM
Moon
Waxing Crescent
Tonight
Clear 48 °F
Clear
Friday
Thunderstorm 59 °F
T-storms
20% chance of precipitation
Friday Night
Thunderstorm 50 °F
T-storms
20% chance of precipitation
Saturday
Partly Cloudy 63 | 50 °F
Partly Cloudy
Sunday
Partly Cloudy 66 | 50 °F
Partly Cloudy
Monday
Partly Cloudy 61 | 48 °F
Partly Cloudy
Today is forecast to be Cooler than yesterday.
Conditions
Pressure
29.78 in
Visibility
10.0 miles
Clouds
Few 1500 ft
Scattered Clouds 1700 ft
Moisture
Humidity
84%
Rainfall
0.00 in
Snow Depth
Not available.
METAR
METAR KSFO 250856Z 28025G33KT 10SM FEW015 SCT017 10/06 A2978 RMK AO2 PK WND 27038/0840 SLP083 T01000056 58002 $
Don't speak METAR? Read our FAQ.
Weather Radio
Launch Weather Radio
Temperature
Windchill
46 °F
Dew Point
45 °F
Wind
Speed / Dir
9.0 mph from West
Wind Gust
14.0 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 Partly cloudy with thunderstorms and a chance of rain. High of 59F. Windy. Winds from the WNW at 25 to 30 mph with gusts to 35 mph. Chance of rain 20%.
Friday Night
nt_tstorms Partly cloudy with thunderstorms and a chance of rain. Low of 50F. Breezy. Winds from the West at 10 to 20 mph. Chance of rain 20%.
Saturday
partlycloudy Partly cloudy. High of 63F. Breezy. Winds from the West at 15 to 20 mph with gusts to 30 mph.
Saturday Night
nt_partlycloudy Partly cloudy. Low of 50F. Breezy. Winds from the West at 5 to 25 mph with gusts to 30 mph.
Sunday
partlycloudy Partly cloudy in the morning, then clear. High of 66F. Breezy. Winds from the West at 15 to 20 mph.
Sunday Night
nt_partlycloudy Partly cloudy in the evening, then overcast. Fog overnight. Low of 50F. Winds from the WNW at 5 to 15 mph.
Monday
partlycloudy Partly cloudy in the morning, then clear. High of 61F. Winds from the WNW at 10 to 15 mph.
Monday Night
nt_clear Partly cloudy. Fog overnight. Low of 48F. Winds from the WNW at 5 to 15 mph.
Tuesday
partlycloudy Partly cloudy in the morning, then clear. High of 64F. Winds from the WNW at 5 to 15 mph.
Tuesday Night
nt_mostlycloudy Mostly cloudy. Fog overnight. Low of 50F. Winds from the WNW at 5 to 10 mph.
Wednesday
partlycloudy Clear. High of 72F. Winds from the WNW at 5 to 15 mph.
Wednesday Night
nt_clear Clear. Fog overnight. Low of 52F. Winds from the West at 5 to 10 mph.
Thursday
partlycloudy Clear. High of 72F. Winds from the West at 5 to 10 mph.
Thursday Night
nt_clear Clear. Low of 54F. Winds from the West at 5 to 10 mph.
Friday
clear Clear. High of 70F. Winds from the West at 5 to 15 mph.
Friday Night
nt_clear Clear. Low of 54F. Winds from the WNW at 5 to 15 mph.
Saturday
clear Clear. High of 64F. Winds from the WNW at 5 to 15 mph.
Saturday Night
nt_clear Clear. Low of 52F. Winds from the WNW at 10 to 15 mph.
Sunday
clear Clear. High of 64F. Breezy. Winds from the WNW at 10 to 20 mph.
Sunday Night
nt_clear Clear. Low of 50F. Breezy. Winds from the WNW at 10 to 20 mph.
Monday
clear Clear. High of 66F. Winds from the WNW at 5 to 20 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 KCASANMA28

Friday, 25
Thunderstorm
59 | 50 °F
T-storms
Chance of
Precipitation
20%
Saturday, 26
Partly Cloudy
63 | 50 °F
Partly Cloudy
Chance of
Precipitation
10%
Sunday, 27
Partly Cloudy
66 | 50 °F
Partly Cloudy
Chance of
Precipitation
0%
Monday, 28
Partly Cloudy
61 | 48 °F
Partly Cloudy
Chance of
Precipitation
0%
Tuesday, 29
Partly Cloudy
64 | 50 °F
Partly Cloudy
Chance of
Precipitation
0%
Wednesday, 30
Partly Cloudy
72 | 52 °F
Partly Cloudy
Chance of
Precipitation
0%
Thursday, 31
Partly Cloudy
72 | 54 °F
Partly Cloudy
Chance of
Precipitation
0%
Friday, 1
Clear
70 | 54 °F
Clear
Chance of
Precipitation
0%
Saturday, 2
Clear
64 | 52 °F
Clear
Chance of
Precipitation
0%
Sunday, 3
Clear
64 | 50 °F
Clear
Chance of
Precipitation
0%
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Friday
tstorms Partly cloudy with thunderstorms and a chance of rain. High of 59F. Windy. Winds from the WNW at 25 to 30 mph with gusts to 35 mph. Chance of rain 20%.
Friday Night
nt_tstorms Partly cloudy with thunderstorms and a chance of rain. Low of 50F. Breezy. Winds from the West at 10 to 20 mph. Chance of rain 20%.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 50 | 44 56 | 45 56 | 47 52 | 46
Wind 22 mph WNW 25 mph WNW 22 mph WNW 14 mph West
Humidity 79% 68% 70% 80%
Chance of Precip. 20% 20% 20% 10%
Cloud Cover 56% 63% 68% 35%
Conditions Chance of Rain Thunderstorm Thunderstorm Partly Cloudy
Sunrise & Sunset
5:52 AM
8:20 PM
The quality of the forecasted high temperature for this day is good. MaxT RMSE [2.34], Average RMSE [1.41]
The National Weather Service forecast quality is fair. MaxT RMSE [2.93], Average RMSE [1.30] : Use NWS
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Saturday
partlycloudy Partly cloudy. High of 63F. Breezy. Winds from the West at 15 to 20 mph with gusts to 30 mph.
Saturday Night
nt_partlycloudy Partly cloudy. Low of 50F. Breezy. Winds from the West at 5 to 25 mph with gusts to 30 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 53 | 46 60 | 53 56 | 49 53 | 48
Wind 7 mph West 16 mph West 20 mph West 8 mph West
Humidity 79% 74% 72% 81%
Chance of Precip. 10% 10% 0% 10%
Cloud Cover 51% 48% 59% 61%
Conditions Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy
Sunrise & Sunset
5:51 AM
8:21 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [3.15], Average RMSE [1.61]
The National Weather Service forecast quality is fair. MaxT RMSE [2.72], Average RMSE [1.26] : Use NWS
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Sunday
partlycloudy Partly cloudy in the morning, then clear. High of 66F. Breezy. Winds from the West at 15 to 20 mph.
Sunday Night
nt_partlycloudy Partly cloudy in the evening, then overcast. Fog overnight. Low of 50F. Winds from the WNW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 51 | 47 61 | 50 60 | 49 53 | 49
Wind 5 mph WSW 15 mph WNW 15 mph WNW 9 mph WNW
Humidity 81% 67% 66% 86%
Chance of Precip. 10% 0% 0% 0%
Cloud Cover 59% 13% 19% 3%
Conditions Partly Cloudy Clear Clear Clear
Sunrise & Sunset
5:51 AM
8:21 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [3.22], Average RMSE [1.49]
The National Weather Service forecast quality is fair. MaxT RMSE [2.89], Average RMSE [1.27] : Use NWS
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Monday
partlycloudy Partly cloudy in the morning, then clear. High of 61F. Winds from the WNW at 10 to 15 mph.
Monday Night
nt_clear Partly cloudy. Fog overnight. Low of 48F. Winds from the WNW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 53 | 48 58 | 50 58 | 49 52 | 46
Wind 8 mph WNW 12 mph WNW 13 mph WNW 8 mph WNW
Humidity 85% 71% 72% 82%
Chance of Precip. 10% 0% 0% 0%
Cloud Cover 99% 2% 0% 5%
Conditions Fog Clear Clear Clear
Sunrise & Sunset
5:51 AM
8:22 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [3.53], Average RMSE [2.32]
The National Weather Service forecast quality is poor. MaxT RMSE [3.75], Average RMSE [1.32] : Use NWS
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Tuesday
partlycloudy Partly cloudy in the morning, then clear. High of 64F. Winds from the WNW at 5 to 15 mph.
Tuesday Night
nt_mostlycloudy Mostly 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 | 47 61 | 49 60 | 50 51 | 46
Wind 7 mph WNW 8 mph WNW 11 mph West 7 mph WNW
Humidity 84% 67% 69% 80%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 45% 2% 0% 100%
Conditions Fog Clear Clear Overcast
Sunrise & Sunset
5:50 AM
8:23 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.37], Average RMSE [1.91]
The National Weather Service forecast quality is poor. MaxT RMSE [4.16], Average RMSE [1.42] : Use NWS
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Wednesday
partlycloudy Clear. High of 72F. Winds from the WNW at 5 to 15 mph.
Wednesday Night
nt_clear Clear. Fog overnight. Low of 52F. Winds from the West at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 53 | 49 63 | 53 65 | 53 55 | 48
Wind 6 mph WNW 8 mph WNW 11 mph WNW 6 mph WNW
Humidity 82% 67% 65% 81%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 2% 0% 0% 0%
Conditions Fog Clear Clear Clear
Sunrise & Sunset
5:50 AM
8:23 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.29], Average RMSE [2.05]
The National Weather Service forecast quality is poor. MaxT RMSE [4.28], Average RMSE [1.30] : Use NWS
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Thursday
partlycloudy Clear. High of 72F. Winds from the West at 5 to 10 mph.
Thursday Night
nt_clear Clear. Low of 54F. Winds from the West at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 54 | 49 65 | 53 66 | 53 54 | 49
Wind 3 mph West 7 mph WNW 9 mph West 5 mph West
Humidity 82% 66% 63% 84%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 0% 0% 0% 0%
Conditions Fog Clear Clear Clear
Sunrise & Sunset
5:50 AM
8:23 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.72], Average RMSE [2.63]
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Friday
clear Clear. High of 70F. Winds from the West at 5 to 15 mph.
Friday Night
nt_clear Clear. Low of 54F. Winds from the WNW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 56 | 51 66 | 56 66 | 55 55 | 52
Wind 5 mph West 7 mph West 11 mph West 10 mph WNW
Humidity 84% 69% 68% 87%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 1% 1% 0% 3%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:50 AM
8:23 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.43], Average RMSE [3.07]
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Saturday
clear Clear. High of 64F. Winds from the WNW at 5 to 15 mph.
Saturday Night
nt_clear Clear. Low of 52F. Winds from the WNW at 10 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 55 | 51 63 | 55 62 | 53 53 | 48
Wind 7 mph WNW 9 mph WNW 14 mph WNW 10 mph WNW
Humidity 88% 75% 73% 81%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 5% 7% 8% 6%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:50 AM
8:23 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.45], Average RMSE [2.88]
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Sunday
clear Clear. High of 64F. Breezy. Winds from the WNW at 10 to 20 mph.
Sunday Night
nt_clear Clear. Low of 50F. Breezy. Winds from the WNW at 10 to 20 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 53 | 49 62 | 52 62 | 49 53 | 45
Wind 9 mph WNW 11 mph WNW 16 mph WNW 12 mph WNW
Humidity 86% 71% 61% 72%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 4% 3% 1% 1%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:50 AM
8:23 PM
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Monday
clear Clear. High of 66F. Winds from the WNW at 5 to 20 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 62 | 51 62 | 47 53 | 45
Wind 9 mph WNW 10 mph WNW 15 mph WNW 10 mph WNW
Humidity 79% 66% 57% 71%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 1% 1% 1% %
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:50 AM
8:23 PM
Scientific Forecaster Discussion — MOS Weather Graph
Nearby
History & Almanac
May 25, 2012 Max Temp Min Temp
Normal (KSFO) 68 °F 51 °F
Record (KSFO) 87 °F (1951) 45 °F (1967)
Yesterday 63 °F 50 °F
Yesterday's Heating Degree Days: 8
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
Port Chicago, CA 64.0 °F
Marine Forecast
Astronomy
May. 25, 2012 Rise Set
Actual Time 5:52 AM PDT 8:20 PM PDT
Civil Twilight 5:22 AM PDT 8:50 PM PDT
Nautical Twilight 4:45 AM PDT 9:28 PM PDT
Astronomical Twilight 4:03 AM PDT 10:09 PM PDT
Moon 9:55 AM PDT No Moon Set
Length Of Visible Light 15h 28m
Length of Day
14h 27m
Tomorrow will be 1m 18s 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
Blue Canyon
37 °F
Alturas
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
Ebbetts Pass 0 in 8700 ft
Rubicon #2 0 in 7500 ft
Snow Depth Reports — Snow Depth Map
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Travel & Activities
Travel Planning
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Nearby Events
Event Date Forecast
Mega Low Tide Mussel/Clam Extravaganza 8:00 AM PDT 2012-05-25 Chance of Rain, 52°F
House of Floyd 8:00 PM PDT 2012-05-26 Partly Cloudy, 55°F
Tom Daggett and Paul Fifield 6:00 PM PDT 2012-05-26 Partly Cloudy, 56°F
Guerrilla Marketing Unveiled Workshop 9:00 AM PDT 2012-05-26 Partly Cloudy, 53°F
Tom Daggett and Paul Fifield with special guest Hobbyhorse 6:00 PM PDT 2012-05-26 Partly Cloudy, 56°F
The Fred Ross Project 4:00 PM PDT 2012-05-27 Partly Cloudy, 60°F
Event data courtesy eviesays.com
Aviation
City Temp. Conditions Updated
San Francisco 50 °F Scattered Clouds 1:56 AM PDT
San Carlos 50 °F Partly Cloudy 2:50 AM PDT
Half Moon Bay 48 °F Mostly Cloudy 2:55 AM PDT
Oakland 51 °F Partly Cloudy 2:53 AM PDT
View all Aviation Tools
Flight To ETA Status
UPS942
Louisville, KY 		KOAK 03:54AM On Time
FDX1167
Fort Worth, TX 		KOAK 04:33AM On Time
FDX1419
Memphis, TN 		KOAK 04:59AM On Time
UPS946
Louisville, KY 		KOAK 05:10AM On Time
UAL706
Kahului, HI 		KSFO 04:22AM On Time
UAL396
Honolulu, HI 		KSFO 05:09AM On Time
FDX1545
Memphis, TN 		KSFO 05:42AM On Time
ABX805
Covington, KY 		KSFO 06:42AM On Time
Flight Tracker by FlightAware FlightAware
View U.S. Airport Delays
Type Condition
Flight Rule: VFR (KSFO)
Wind Speed: 25.0 kts.
Wind Dir: 269° (West)
Ceiling: Unlimited

METAR KSFO 250856Z 28025G33KT 10SM FEW015 SCT017 10/06 A2978 RMK AO2 PK WND 27038/0840 SLP083 T01000056 58002 $

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
Yankees vs. Athletics 7:05 PM PDT on May 25, 2012 Thunderstorm, 56 °F
Yankees vs. Athletics 1:05 PM PDT on May 26, 2012 Partly Cloudy, 61 °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
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
North Shoreview, San Mateo, CA 49.9 °F 46 °F 45 °F 84% West  at  9.0 mph 0.00 in / hr 10 ft 2:59 AM PDT Rapid Fire  
3rd Avenue, Foster City, CA 49.8 °F 40 °F 44 °F 84% WSW  at  42.0 mph 0.00 in / hr 150 ft 2:02 AM PDT Normal  
Upper Hillsborough, Hillsborough, CA 47.5 °F 44 °F 44 °F 87% NW  at  8.0 mph 0.00 in / hr 536 ft 2:59 AM PDT Rapid Fire  
Lauriedale, San Mateo, CA 51.5 °F - 44 °F 76% NW  at  2.7 mph 0.00 in / hr 30 ft 2:59 AM PDT Rapid Fire  
Laurelwood, San Mateo, CA 48.5 °F 48 °F 43 °F 82% ENE  at  3.0 mph - / hr 300 ft 2:45 AM PDT Normal  
Neighborhood 4, Foster City, CA 50.6 °F - 45 °F 81% NNW  at  5.0 mph 8.98 in / hr 12 ft 1:00 AM PDT Rapid Fire  
APRSWXNET Belmont CA , Belmont, CA 49 °F 47 °F 43 °F 81% SSW  at  5 mph 0.00 in / hr 357 ft 2:31 AM PDT MADIS
Burlingame, Burlingame, CA 49.5 °F 46 °F 43 °F 74% North  at  7.6 mph 0.00 in / hr 400 ft 2:55 AM PDT Normal  
Belmont - Island Park, Belmont, CA 50.2 °F - 40 °F 69% WSW  at  8.1 mph 0.00 in / hr 5 ft 2:59 AM PDT Rapid Fire
Redwood Shores, Redwood City, CA 50.7 °F - 42 °F 73% WSW  at  0.2 mph 0.00 in / hr 0 ft 2:59 AM PDT Rapid Fire
Stratford Bay, Redwood City, CA 51.5 °F - 46 °F 81% North  at  18.0 mph 0.00 in / hr -10 ft 2:59 AM PDT Rapid Fire  
HADS CRYSTAL SPRINGS COTTAGE NEAR SAN CA, Half Moon Bay, CA - - - - North  at  - 0.00 in / hr 342 ft 2:01 AM PDT MADIS
MesoWest San Carlos , Redwood City, CA 51 °F - 42 °F 73% NW  at  9 mph 0.00 in / hr 0 ft 1:00 AM PDT MADIS
Beverly Terrace, San Carlos, CA 46.5 °F 41 °F 41 °F 82% NW  at  13.0 mph 0.00 in / hr 812 ft 2:55 AM PDT Normal  
White Oaks, San Carlos, CA 49.9 °F 50 °F 43 °F 76% SW  at  2.0 mph 0.00 in / hr 52 ft 2:47 AM PDT Normal  
Centennial, Redwood City, CA 50.8 °F - 44 °F 77% SE  at  3.0 mph 0.00 in / hr 10 ft 2:45 AM PDT Normal
RAWS PULGAS CA, Half Moon Bay, CA 48 °F 41 °F 39 °F 72% West  at  19 mph 0.00 in / hr 644 ft 1:38 AM PDT MADIS
Crestmoor, San Bruno, CA 46.5 °F 44 °F 43 °F 89% West  at  6.0 mph 0.00 in / hr 500 ft 2:59 AM PDT Rapid Fire  
Edgewood Park, Redwood City, CA 50.5 °F - 42 °F 73% WSW  at  1.9 mph 0.00 in / hr 53 ft 2:57 AM PDT Normal  
Canyon Rd. Redwood City, CA, Redwood City, CA 50.0 °F 48 °F 46 °F 87% SW  at  4.7 mph - / hr 0 ft 2:58 AM PDT Normal  
Emerald Hills, Redwood City, CA 49.0 °F 42 °F 38 °F 67% NW  at  22.0 mph 0.00 in / hr 790 ft 2:58 AM PDT Normal
Redwood City Hills, Redwood City, CA 51.1 °F - 40 °F 67% WNW  at  6.5 mph 0.00 in / hr 170 ft 2:58 AM PDT Normal  
Sunset Way, Emerald Hills, CA 47.0 °F 45 °F 41 °F 80% WNW  at  5.0 mph 0.00 in / hr 748 ft 2:55 AM PDT Normal
Lower Hillcrest, Emerald Hills, CA 48.1 °F 48 °F 40 °F 75% North  at  0.0 mph 0.00 in / hr 535 ft 2:59 AM PDT Rapid Fire  
Rollingwood, San Bruno, CA 46.9 °F 40 °F 43 °F 86% East  at  15.9 mph 0.00 in / hr 0 ft 2:59 AM PDT Rapid Fire  
Sterling Heights, Redwood City, CA 49.7 °F 47 °F 22 °F 34% NW  at  6.0 mph 0.00 in / hr 134 ft 2:59 AM PDT Rapid Fire  
Monte Verde Area, San Bruno, CA 47.5 °F 44 °F 43 °F 84% NNW  at  6.7 mph 0.00 in / hr 490 ft 2:59 AM PDT Rapid Fire  
Stulsaft Park, Redwood City, CA 50.4 °F - 41 °F 69% North  at  0.0 mph 0.00 in / hr 233 ft 2:59 AM PDT Rapid Fire  
Cattle Hill, Pacifica, CA 46.0 °F 40 °F 45 °F 95% NNW  at  14.0 mph 0.00 in / hr 679 ft 2:59 AM PDT Normal  
Higgins Canyon, Half Moon Bay, CA 46.4 °F 45 °F 44 °F 90% SE  at  4.0 mph 0.00 in / hr 380 ft 2:59 AM PDT Rapid Fire  
West Fairway Park, Pacifica, CA 50.4 °F - 45 °F 83% WNW  at  9.0 mph 0.00 in / hr 40 ft 2:56 AM PDT Normal
Beresford Ave, Redwood City, CA 51.8 °F - 40 °F 67% WNW  at  4.9 mph 0.00 in / hr 66 ft 2:57 AM PDT Normal
Woodside Glens, Woodside, CA 50.1 °F - 42 °F 75% NW  at  2.0 mph 0.00 in / hr 381 ft 2:55 AM PDT Normal  
RAWS SPRING VALLEY CA, Millbrae, CA 45 °F 39 °F 42 °F 88% WNW  at  14 mph 0.00 in / hr 1075 ft 2:19 AM PDT MADIS
Kings Mountain, Woodside, CA 42.2 °F 36 °F 41 °F 96% WSW  at  10.0 mph 0.00 in / hr 1700 ft 2:59 AM PDT Rapid Fire  
King's Mountain 2100ft, Woodside, CA 40.1 °F 37 °F 34 °F 78% SW  at  4.0 mph 0.00 in / hr 2100 ft 2:57 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