Clayton, CA

4:29 AM PDT on May 25, 2012 (GMT -0700)
Elev: 623 ft
Lon: 121.9° W
Lat: 37.9° 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

Clayton Weather at a Glance

Updated 4:24 AM PDT
Weather Station - report
East Concord, Concord
Elevation
362 ft
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Now
Clear
Clear
Temperature
48.3 °F
Feels Like 48 °F
Wind(mph)
2.0
Sunrise / Set
5:49 AM
8:19 PM
Moon
Waxing Crescent
Today
Thunderstorm 72 °F
T-storms
20% chance of precipitation
Tonight
Thunderstorm 46 °F
T-storms
20% chance of precipitation
Tomorrow
Partly Cloudy 73 | 46 °F
Partly Cloudy
Sunday
Partly Cloudy 79 | 48 °F
Partly Cloudy
Monday
Partly Cloudy 72 | 46 °F
Partly Cloudy
Tuesday
Partly Cloudy 75 | 50 °F
Partly Cloudy
Today is forecast to be Cooler than yesterday.
Conditions
Pressure
29.68 in
Visibility
10.0 miles
Clouds
Clear -
Moisture
Humidity
73%
Rainfall
0.00 in
Snow Depth
Not available.
METAR
METAR KCCR 251053Z 29012G18KT 10SM CLR 10/03 A2972 RMK AO2 SLP051 T01000028
Don't speak METAR? Read our FAQ.
Weather Radio
Launch Weather Radio
Temperature
Windchill
48 °F
Dew Point
40 °F
Wind
Speed / Dir
2.0 mph from SSE
Wind Gust
5.0 mph
Health
UV
0 out of 16
Pollen
6.50 out of 12
Pollen Forecast
Ozone
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 72F. Winds from the West at 10 to 15 mph. Chance of rain 20%.
Friday Night
nt_tstorms Mostly cloudy with thunderstorms and a chance of rain in the evening, then partly cloudy. Low of 46F. Winds from the SW at 5 to 15 mph. Chance of rain 20%.
Saturday
partlycloudy Partly cloudy in the morning, then clear. High of 73F. Winds from the SW at 10 to 15 mph.
Saturday Night
nt_partlycloudy Partly cloudy. Low of 46F. Winds from the SW at 10 to 15 mph.
Sunday
partlycloudy Partly cloudy in the morning, then clear. High of 79F. Winds from the WSW at 5 to 15 mph.
Sunday Night
nt_partlycloudy Partly cloudy. Fog overnight. Low of 48F. Winds from the SW at 5 to 10 mph.
Monday
partlycloudy Partly cloudy in the morning, then clear. High of 72F. Winds from the WSW at 5 to 15 mph.
Monday Night
nt_partlycloudy Partly cloudy. Fog overnight. Low of 46F. Winds from the SW at 5 to 10 mph.
Tuesday
partlycloudy Clear. High of 75F. Winds from the WSW at 5 to 10 mph.
Tuesday Night
nt_mostlycloudy Mostly cloudy. Fog overnight. Low of 50F. Winds from the SW at 5 to 10 mph.
Wednesday
partlycloudy Clear. High of 84F. Winds from the WSW at 5 to 10 mph.
Wednesday Night
nt_clear Clear. Low of 54F. Winds from the SW at 5 to 10 mph.
Thursday
clear Clear. High of 88F. Winds from the WSW at 5 to 10 mph.
Thursday Night
nt_clear Clear. Low of 55F. Winds from the SW at 5 to 10 mph.
Friday
clear Clear. High of 84F. Winds from the WSW at 5 to 10 mph.
Friday Night
nt_clear Clear. Low of 54F. Winds from the WSW at 5 to 15 mph.
Saturday
clear Clear. High of 81F. Winds from the West at 5 to 15 mph.
Saturday Night
nt_clear Clear. Low of 52F. Winds from the WSW at 5 to 15 mph.
Sunday
clear Clear. High of 81F. Winds from the West at 5 to 15 mph.
Sunday Night
nt_clear Clear. Low of 52F. Winds from the West at 5 to 15 mph.
Monday
clear Clear. High of 82F. Winds from the West at 5 to 15 mph.
Monday Night
nt_clear Clear. Low of 52F. Winds from the WSW at 5 to 15 mph.
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Forecast

View Calendar 10-Day Forecast for station KCACONCO12

Friday, 25
Thunderstorm
72 | 46 °F
T-storms
Chance of
Precipitation
20%
Saturday, 26
Partly Cloudy
73 | 46 °F
Partly Cloudy
Chance of
Precipitation
10%
Sunday, 27
Partly Cloudy
79 | 48 °F
Partly Cloudy
Chance of
Precipitation
10%
Monday, 28
Partly Cloudy
72 | 46 °F
Partly Cloudy
Chance of
Precipitation
0%
Tuesday, 29
Partly Cloudy
75 | 50 °F
Partly Cloudy
Chance of
Precipitation
0%
Wednesday, 30
Partly Cloudy
84 | 54 °F
Partly Cloudy
Chance of
Precipitation
0%
Thursday, 31
Clear
88 | 55 °F
Clear
Chance of
Precipitation
0%
Friday, 1
Clear
84 | 54 °F
Clear
Chance of
Precipitation
0%
Saturday, 2
Clear
81 | 52 °F
Clear
Chance of
Precipitation
0%
Sunday, 3
Clear
81 | 52 °F
Clear
Chance of
Precipitation
0%
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Friday
tstorms Mostly cloudy with thunderstorms and a chance of rain. High of 72F. Winds from the West at 10 to 15 mph. Chance of rain 20%.
Friday Night
nt_tstorms Mostly cloudy with thunderstorms and a chance of rain in the evening, then partly cloudy. Low of 46F. Winds from the SW at 5 to 15 mph. Chance of rain 20%.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 47 | 38 65 | 41 69 | 44 54 | 47
Wind 11 mph WSW 13 mph West 12 mph WNW 9 mph SW
Humidity 73% 41% 41% 77%
Chance of Precip. 20% 20% 20% 10%
Cloud Cover 65% 77% 80% 31%
Conditions Chance of Rain Thunderstorm Thunderstorm Partly Cloudy
Sunrise & Sunset
5:49 AM
8:19 PM
The quality of the forecasted high temperature for this day is good. MaxT RMSE [2.20], Average RMSE [2.19]
The National Weather Service forecast quality is good. MaxT RMSE [1.76], Average RMSE [2.53] : Use NWS
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Saturday
partlycloudy Partly cloudy in the morning, then clear. High of 73F. Winds from the SW at 10 to 15 mph.
Saturday Night
nt_partlycloudy Partly cloudy. Low of 46F. Winds from the SW at 10 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 50 | 44 67 | 52 69 | 53 53 | 49
Wind 10 mph SW 11 mph SW 14 mph WSW 11 mph SW
Humidity 77% 58% 57% 83%
Chance of Precip. 10% 10% 10% 0%
Cloud Cover 50% 6% 17% 53%
Conditions Partly Cloudy Clear Clear Partly Cloudy
Sunrise & Sunset
5:49 AM
8:20 PM
The quality of the forecasted high temperature for this day is good. MaxT RMSE [2.33], Average RMSE [2.08]
The National Weather Service forecast quality is good. MaxT RMSE [2.40], Average RMSE [2.63] : 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 79F. Winds from the WSW at 5 to 15 mph.
Sunday Night
nt_partlycloudy Partly cloudy. Fog overnight. Low of 48F. Winds from the SW at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 50 | 44 73 | 53 75 | 49 53 | 49
Wind 7 mph SW 9 mph WSW 12 mph West 8 mph SW
Humidity 77% 48% 40% 82%
Chance of Precip. 0% 10% 10% 0%
Cloud Cover 53% 10% 13% 0%
Conditions Partly Cloudy Clear Clear Clear
Sunrise & Sunset
5:48 AM
8:21 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [2.73], Average RMSE [2.09]
The National Weather Service forecast quality is fair. MaxT RMSE [2.71], Average RMSE [2.66] : Use NWS
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Monday
partlycloudy Partly cloudy in the morning, then clear. High of 72F. Winds from the WSW at 5 to 15 mph.
Monday Night
nt_partlycloudy Partly cloudy. Fog overnight. Low of 46F. Winds from the SW at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 53 | 47 65 | 49 69 | 49 52 | 51
Wind 6 mph SW 9 mph WSW 11 mph WSW 7 mph SW
Humidity 85% 53% 52% 91%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 52% 0% 0% 2%
Conditions Fog Clear Clear Clear
Sunrise & Sunset
5:48 AM
8:22 PM
The quality of the forecasted high temperature for this day is good. MaxT RMSE [2.26], Average RMSE [2.87]
The National Weather Service forecast quality is fair. MaxT RMSE [2.93], Average RMSE [2.74] : Use NWS
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Tuesday
partlycloudy Clear. High of 75F. Winds from the WSW at 5 to 10 mph.
Tuesday Night
nt_mostlycloudy Mostly cloudy. Fog overnight. Low of 50F. Winds from the SW at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 49 | 43 70 | 46 69 | 47 54 | 45
Wind 4 mph WSW 5 mph West 9 mph WSW 7 mph WSW
Humidity 78% 44% 46% 71%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 35% 0% 0% 100%
Conditions Fog Clear Clear Overcast
Sunrise & Sunset
5:47 AM
8:22 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [3.28], Average RMSE [2.74]
The National Weather Service forecast quality is poor. MaxT RMSE [3.78], Average RMSE [2.82] : Use NWS
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Wednesday
partlycloudy Clear. High of 84F. Winds from the WSW at 5 to 10 mph.
Wednesday Night
nt_clear Clear. Low of 54F. Winds from the SW at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 52 | 45 73 | 45 74 | 48 58 | 48
Wind 5 mph SW 5 mph West 9 mph WSW 7 mph SW
Humidity 76% 37% 39% 70%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 2% 0% 0% 0%
Conditions Fog Clear Clear Clear
Sunrise & Sunset
5:47 AM
8:22 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [5.17], Average RMSE [2.96]
The National Weather Service forecast quality is poor. MaxT RMSE [4.65], Average RMSE [2.98] : Use NWS
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Thursday
clear Clear. High of 88F. Winds from the WSW at 5 to 10 mph.
Thursday Night
nt_clear Clear. Low of 55F. Winds from the SW at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 56 | 48 82 | 55 81 | 52 60 | 51
Wind 5 mph SW 4 mph West 9 mph WSW 7 mph SW
Humidity 79% 39% 39% 70%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 0% 0% 0% 0%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:47 AM
8:22 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [5.29], Average RMSE [2.95]
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Friday
clear Clear. High of 84F. Winds from the WSW at 5 to 10 mph.
Friday Night
nt_clear Clear. Low of 54F. Winds from the WSW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 57 | 50 79 | 51 78 | 56 58 | 50
Wind 6 mph SW 5 mph WSW 10 mph WSW 9 mph WSW
Humidity 78% 37% 45% 72%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 0% 0% 0% 2%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:47 AM
8:22 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.73], Average RMSE [3.12]
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Saturday
clear Clear. High of 81F. Winds from the West at 5 to 15 mph.
Saturday Night
nt_clear Clear. Low of 52F. Winds from the WSW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 56 | 52 76 | 54 75 | 54 56 | 49
Wind 7 mph WSW 6 mph West 12 mph West 8 mph West
Humidity 83% 46% 49% 77%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 5% 7% 9% 7%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:47 AM
8:22 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.85], Average RMSE [2.30]
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Sunday
clear Clear. High of 81F. Winds from the West at 5 to 15 mph.
Sunday 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 74 | 62 73 | 55 55 | 45
Wind 6 mph WSW 7 mph WNW 13 mph West 9 mph West
Humidity 86% 66% 52% 68%
Chance of Precip. 0% 0% 0% 10%
Cloud Cover 5% 3% 1% 2%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:47 AM
8:22 PM
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Monday
clear Clear. High of 82F. Winds from the West at 5 to 15 mph.
Monday Night
nt_clear Clear. Low of 52F. Winds from the WSW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 54 | 47 76 | 62 75 | 55 55 | 45
Wind 6 mph West 6 mph WNW 12 mph West 8 mph West
Humidity 78% 60% 49% 66%
Chance of Precip. 10% 0% 0% 0%
Cloud Cover 2% 1% 1% %
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:47 AM
8:22 PM
Scientific Forecaster Discussion — MOS Weather Graph
Nearby
History & Almanac
May 25, 2012 Max Temp Min Temp
Normal (KCCR) 80 °F 53 °F
Record (KCCR) 91 °F (2005) 48 °F (2010)
Yesterday 76 °F 52 °F
Yesterday's Heating Degree Days: 1
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
Current Good
OZONE
Friday Good
OZONE
Saturday Good
OZONE
Sunday Good
OZONE
Monday Good
OZONE
Tuesday Good
OZONE
Coastal Water Temperatures
Place Temperature
San Francisco, CA 53.1 °F
Port Chicago, CA 63.0 °F
Marine Forecast
Astronomy
May. 25, 2012 Rise Set
Actual Time 5:49 AM PDT 8:19 PM PDT
Civil Twilight 5:19 AM PDT 8:50 PM PDT
Nautical Twilight 4:42 AM PDT 9:27 PM PDT
Astronomical Twilight 4:00 AM PDT 10:09 PM PDT
Moon 9:53 AM PDT No Moon Set
Length Of Visible Light 15h 30m
Length of Day
14h 29m
Tomorrow will be 1m 18s 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
35 °F
Weaverville
35 °F
Blue Canyon
36 °F
Alturas
36 °F
Mount Shasta
Record Extremes
Snow Depth
Station Depth Elevation
Carson Pass 0 in 8500 ft
Blue Lakes 0 in 8000 ft
Forestdale Creek 1 in 8029 ft
Rubicon #2 1 in 7500 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
A Musical Journey From the '70s To Today 6:00 PM PDT 2012-05-25 Thunderstorm, 66°F
Butterfield 8 presents - LETTICE AND LOVAGE 8:00 PM PDT 2012-05-25 Thunderstorm, 63°F
A Musical Journey From the '70s To Today 6:00 PM PDT 2012-05-26 Clear, 68°F
Butterfield 8 presents - LETTICE AND LOVAGE 8:00 PM PDT 2012-05-26 Clear, 63°F
Justin McRoberts CMY(K) \"Goetz House\" Concert 7:00 PM PDT 2012-05-26 Clear, 65°F
\"Simply Delicious\" \nDanville Culinary Walking Tour 10:00 AM PDT 2012-05-26 Partly Cloudy, 60°F
Event data courtesy eviesays.com
Aviation
City Temp. Conditions Updated
Concord 50 °F Clear 3:53 AM PDT
Livermore 50 °F Partly Cloudy 3:53 AM PDT
Hayward 51 °F Clear 3:54 AM PDT
Oakland 51 °F Partly Cloudy 3:53 AM PDT
View all Aviation Tools
Flight To ETA Status
FDX1167
Fort Worth, TX 		KOAK 04:39AM On Time
FDX1419
Memphis, TN 		KOAK 05:02AM On Time
UPS946
Louisville, KY 		KOAK 05:14AM On Time
FDX1705
Indianapolis, IN 		KOAK 05:23AM On Time
Flight Tracker by FlightAware FlightAware
View U.S. Airport Delays
Type Condition
Flight Rule: VFR (KCCR)
Wind Speed: 12.0 kts.
Wind Dir: 153° (SSE)
Ceiling: Unlimited

METAR KCCR 251053Z 29012G18KT 10SM CLR 10/03 A2972 RMK AO2 SLP051 T01000028

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
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, 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
RAWS BLACK DIAMOND CA, Clayton, CA 43 °F 35 °F 37 °F 79% West  at  19 mph 0.00 in / hr 1600 ft 3:28 AM PDT MADIS
East Concord, Concord, CA 48.3 °F 48 °F 40 °F 73% SSE  at  2.0 mph 0.00 in / hr 362 ft 4:24 AM PDT Normal  
Claycord, Concord, CA 47.3 °F 47 °F 38 °F 71% NNW  at  0.0 mph 0.00 in / hr 292 ft 4:29 AM PDT Rapid Fire  
Pentozzi Treat & Cowell, Concord, CA 49.5 °F 50 °F 37 °F 63% West  at  0.0 mph 0.00 in / hr 250 ft 4:29 AM PDT Rapid Fire  
Top of Woodland Hills, Pittsburg, CA 51.6 °F - 34 °F 50% WSW  at  8.1 mph 0.00 in / hr 300 ft 4:29 AM PDT Rapid Fire  
Woodlands, Walnut Creek, CA 50.1 °F - 37 °F 60% NNW  at  3.0 mph 0.00 in / hr 68 ft 4:25 AM PDT Normal
Dana Estates, Concord, CA 52.1 °F - 41 °F 65% SSW  at  0.0 mph - / hr 155 ft 4:28 AM PDT Normal
APRSWXNET Diablo CA , Diablo, CA 46 °F 46 °F 38 °F 74% West  at  1 mph 0.00 in / hr 853 ft 3:08 AM PDT MADIS
Pittsburg's Delta View Golf Course, Pittsburg, CA 50.0 °F 45 °F 33 °F 51% West  at  13.8 mph 0.00 in / hr 200 ft 4:29 AM PDT Rapid Fire
APRSWXNET Walnut Creek CA U, Walnut Creek, CA 50 °F - 34 °F 55% WNW  at  0 mph 0.00 in / hr 114 ft 4:02 AM PDT MADIS
Concord, CA 50.6 °F - 35 °F 56% West  at  2.1 mph 0.00 in / hr 80 ft 4:27 AM PDT Normal  
Randy's Antioch Weather Station, Antioch, CA 50.2 °F - 36 °F 58% SW  at  7.0 mph 0.00 in / hr 89 ft 4:25 AM PDT Normal
Pittsburg, CA (Marina), Pittsburg, CA 51.2 °F - 40 °F 66% SW  at  4.0 mph 0.00 in / hr 10 ft 4:26 AM PDT Normal  
Downtown, Walnut Creek, CA 48.3 °F 48 °F 39 °F 71% SE  at  0.0 mph 0.00 in / hr 145 ft 4:14 AM PDT Normal  
APRSWXNET Blackhawk CA, Danville, CA 47 °F 44 °F 41 °F 78% WNW  at  7 mph 0.00 in / hr 816 ft 3:59 AM PDT MADIS
APRSWXNET Antioch CA , Antioch, CA 50 °F 45 °F 37 °F 61% West  at  12 mph 0.00 in / hr 243 ft 4:01 AM PDT MADIS
Ridgerock, Antioch, CA 50.0 °F 44 °F 38 °F 62% West  at  20.0 mph 0.00 in / hr 136 ft 4:28 AM PDT Rapid Fire  
Alamo - Castle Crest, Alamo, CA 48.1 °F 48 °F 39 °F 70% West  at  0.0 mph 0.00 in / hr 344 ft 4:28 AM PDT Normal
West Alamo - Litina, Alamo, CA 47.5 °F 48 °F 41 °F 77% West  at  0.7 mph 0.00 in / hr 269 ft 4:28 AM PDT Rapid Fire  
Larkey Park, Walnut Creek, CA 49.5 °F 50 °F 38 °F 64% West  at  1.0 mph 0.00 in / hr 150 ft 4:29 AM PDT Rapid Fire
Montair School, Danville, CA 47.0 °F 47 °F 38 °F 72% South  at  0.0 mph 0.00 in / hr 200 ft 4:29 AM PDT Rapid Fire  
Dinosaur Hill Park, Pleasant Hill, CA 49.2 °F 49 °F 40 °F 69% SSE  at  0.0 mph 0.00 in / hr 131 ft 4:24 AM PDT Normal  
K6TPK, Concord, CA 50.9 °F - 33 °F 50% East  at  5.4 mph 0.00 in / hr 23 ft 4:29 AM PDT Rapid Fire
Acalanes Ridge, Walnut Creek, CA 47.5 °F 48 °F 38 °F 70% SSW  at  2.2 mph 0.00 in / hr 307 ft 4:26 AM PDT Normal  
APRSWXNET Brentwood CA , Brentwood, CA 50 °F - 38 °F 64% SSE  at  0 mph 0.00 in / hr 203 ft 4:04 AM PDT MADIS
Hidden Hills Estates, Danville, CA 48.6 °F 49 °F 38 °F 68% South  at  1.1 mph 0.00 in / hr 709 ft 4:29 AM PDT Rapid Fire  
Palos Verde Mall Area, Lafayette, CA 48.7 °F 49 °F 26 °F 40% ENE  at  0.0 mph 0.00 in / hr 204 ft 4:20 AM PDT Normal
Lafayette near Palos Verde Mall, Lafayette, CA 48.2 °F 48 °F 39 °F 71% East  at  0.0 mph 0.00 in / hr 231 ft 4:25 AM PDT Normal  
MesoWest Kregor Peak , Pleasant Hill, CA 44 °F 35 °F - - West  at  25 mph 0.00 in / hr 577 ft 2:00 AM PDT MADIS
Brentwood Hills-live since '07, Brentwood, CA 49.8 °F 45 °F 38 °F 64% WSW  at  11.0 mph 0.00 in / hr 23 ft 4:29 AM PDT Rapid Fire
Burton Valley, LAFAYETTE, CA 47.5 °F 46 °F 38 °F 71% West  at  4.0 mph 0.00 in / hr 587 ft 4:28 AM PDT Rapid Fire  
Mtz/PH K6RHL, Martinez, CA 50.1 °F - 41 °F 71% West  at  2.0 mph 0.00 in / hr 350 ft 4:05 AM PDT Normal
FSTC - San Ramon, San Ramon, CA 47.5 °F 45 °F 40 °F 76% West  at  5.0 mph 0.00 in / hr 468 ft 4:16 AM PDT Normal
KF6IIU, Lafayette, CA 47.8 °F 48 °F 37 °F 68% SSW  at  0.0 mph 0.00 in / hr 400 ft 4:02 AM PDT Normal
RAWS LAS TRAMPAS CA, Walnut Creek, CA 41 °F 34 °F 37 °F 87% NW  at  13 mph 0.00 in / hr 1759 ft 3:28 AM PDT MADIS
RAWS MT. DIABLO CA, Clayton, CA 34 °F 20 °F 34 °F 99% WNW  at  31 mph 0.00 in / hr 3849 ft 3:17 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