Diablo, CA

4:39 AM PDT on May 25, 2012 (GMT -0700)
Elev: 587 ft
Lon: 122.0° W
Lat: 37.8° N
Source
Rapid Fire Updates™
 Updated 4:19 AM PDT Get Free Weather Stickers® Share:
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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

Diablo Weather at a Glance

Updated 4:19 AM PDT
Elevation
816 ft
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Now
Clear
Clear
Temperature
46 °F
Feels Like 43 °F
Wind(mph)
6
Sunrise / Set
5:50 AM
8:19 PM
Moon
Waxing Crescent
Today
Thunderstorm 70 °F
T-storms
20% chance of precipitation
Tonight
Thunderstorm 45 °F
T-storms
20% chance of precipitation
Tomorrow
Partly Cloudy 72 | 45 °F
Partly Cloudy
Sunday
Partly Cloudy 79 | 46 °F
Partly Cloudy
Monday
Fog 73 | 45 °F
Fog
Tuesday
Partly Cloudy 73 | 43 °F
Partly Cloudy
Today is forecast to be Cooler than yesterday.
Conditions
Pressure
29.68 in
Visibility
10.0 miles
Clouds
Clear -
Moisture
Humidity
79%
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
43 °F
Dew Point
40 °F
Wind
Speed / Dir
6 mph from WNW
Wind Gust
14.0 mph
Health
UV
0 out of 16
Pollen
6.50 out of 12
Pollen Forecast
Ozone
Good
PM2.5
Good
Flu Activity
Local Activity
View Flu Map
Loading…
Source: BestForecast
Descriptive Forecast
Friday
tstorms Mostly cloudy with thunderstorms and a chance of rain. High of 70F. Winds from the WNW 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 45F. Winds from the WSW at 5 to 10 mph. Chance of rain 20%.
Saturday
partlycloudy Partly cloudy. High of 72F. Winds from the SW at 10 to 15 mph.
Saturday Night
nt_partlycloudy Partly cloudy. Low of 45F. Winds from the SW at 5 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 in the evening, then overcast. Fog overnight. Low of 46F. Winds from the WSW at 5 to 10 mph.
Monday
partlycloudy Overcast in the morning, then partly cloudy. Fog early. High of 73F. Winds from the WSW at 5 to 15 mph.
Monday Night
nt_partlycloudy Partly cloudy in the evening, then overcast. Fog overnight. Low of 45F. Winds from the WSW at 5 to 10 mph.
Tuesday
partlycloudy Overcast in the morning, then clear. High of 73F. Winds from the West at 5 to 10 mph.
Tuesday Night
nt_mostlycloudy Mostly cloudy. Fog overnight. Low of 43F. Winds from the WSW 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 48F. Winds from the SW at 5 to 10 mph.
Thursday
clear Clear. High of 84F. Winds from the WSW at 5 to 10 mph.
Thursday Night
nt_clear Clear. Low of 54F. Winds from the SW at 5 to 10 mph.
Friday
clear Clear. High of 82F. Winds from the SW at 5 to 10 mph.
Friday Night
nt_clear Clear. Low of 55F. Winds from the WSW at 5 to 15 mph.
Saturday
clear Clear. High of 79F. Winds from the West at 5 to 15 mph.
Saturday Night
nt_clear Clear. Low of 50F. Winds from the West 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 50F. Winds from the West at 5 to 15 mph.
Monday
clear Clear. High of 79F. Winds from the West at 5 to 15 mph.
Monday Night
nt_clear Clear. Low of 50F. Winds from the West at 5 to 15 mph.
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Forecast

View Calendar 10-Day Forecast for station KCADANVI5

Friday, 25
Thunderstorm
70 | 45 °F
T-storms
Chance of
Precipitation
20%
Saturday, 26
Partly Cloudy
72 | 45 °F
Partly Cloudy
Chance of
Precipitation
10%
Sunday, 27
Partly Cloudy
79 | 46 °F
Partly Cloudy
Chance of
Precipitation
10%
Monday, 28
Fog
73 | 45 °F
Fog
Chance of
Precipitation
0%
Tuesday, 29
Partly Cloudy
73 | 43 °F
Partly Cloudy
Chance of
Precipitation
0%
Wednesday, 30
Partly Cloudy
84 | 48 °F
Partly Cloudy
Chance of
Precipitation
0%
Thursday, 31
Clear
84 | 54 °F
Clear
Chance of
Precipitation
0%
Friday, 1
Clear
82 | 55 °F
Clear
Chance of
Precipitation
0%
Saturday, 2
Clear
79 | 50 °F
Clear
Chance of
Precipitation
0%
Sunday, 3
Clear
81 | 50 °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 70F. Winds from the WNW 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 45F. Winds from the WSW at 5 to 10 mph. Chance of rain 20%.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 47 | 38 61 | 38 62 | 41 53 | 46
Wind 11 mph WNW 12 mph WNW 10 mph WNW 6 mph WSW
Humidity 73% 41% 46% 81%
Chance of Precip. 20% 20% 20% 10%
Cloud Cover 62% 74% 80% 33%
Conditions Chance of Rain Thunderstorm Thunderstorm Partly Cloudy
Sunrise & Sunset
5:50 AM
8:19 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [2.86], Average RMSE [1.19]
The National Weather Service forecast quality is fair. MaxT RMSE [3.03], Average RMSE [1.38] : 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 SW at 10 to 15 mph.
Saturday Night
nt_partlycloudy Partly cloudy. Low of 45F. Winds from the SW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 50 | 46 63 | 51 66 | 51 51 | 47
Wind 9 mph SW 11 mph SW 13 mph WSW 9 mph SW
Humidity 82% 61% 57% 85%
Chance of Precip. 10% 10% 10% 10%
Cloud Cover 51% 23% 27% 56%
Conditions Partly Cloudy Clear Partly Cloudy Partly Cloudy
Sunrise & Sunset
5:49 AM
8:20 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [2.86], Average RMSE [1.04]
The National Weather Service forecast quality is fair. MaxT RMSE [3.33], Average RMSE [1.90] : 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 in the evening, then overcast. Fog overnight. Low of 46F. Winds from the WSW at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 50 | 47 72 | 56 69 | 48 54 | 49
Wind 6 mph SW 7 mph WSW 11 mph West 7 mph WSW
Humidity 85% 56% 47% 86%
Chance of Precip. 10% 10% 10% 0%
Cloud Cover 54% 12% 13% 0%
Conditions Partly Cloudy Clear Clear Fog
Sunrise & Sunset
5:49 AM
8:21 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [3.64], Average RMSE [1.59]
The National Weather Service forecast quality is fair. MaxT RMSE [3.43], Average RMSE [2.23] : Use NWS
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Monday
partlycloudy Overcast in the morning, then partly cloudy. Fog early. High of 73F. Winds from the WSW at 5 to 15 mph.
Monday Night
nt_partlycloudy Partly cloudy in the evening, then overcast. Fog overnight. Low of 45F. Winds from the WSW at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 50 | 47 63 | 50 67 | 45 51 | 47
Wind 5 mph WSW 9 mph WSW 10 mph WSW 6 mph SW
Humidity 85% 61% 46% 86%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 99% 0% 0% 13%
Conditions Fog Clear Clear Fog
Sunrise & Sunset
5:48 AM
8:21 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.10], Average RMSE [2.35]
The National Weather Service forecast quality is poor. MaxT RMSE [4.31], Average RMSE [2.44] : Use NWS
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Tuesday
partlycloudy Overcast in the morning, then clear. High of 73F. Winds from the West at 5 to 10 mph.
Tuesday Night
nt_mostlycloudy Mostly cloudy. Fog overnight. Low of 43F. Winds from the WSW at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 50 | 44 68 | 46 67 | 43 53 | 47
Wind 3 mph WSW 5 mph West 8 mph WSW 6 mph WSW
Humidity 80% 46% 43% 80%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 99% 0% 0% 100%
Conditions Fog Clear Clear Fog
Sunrise & Sunset
5:48 AM
8:22 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [3.46], Average RMSE [3.29]
The National Weather Service forecast quality is poor. MaxT RMSE [5.23], Average RMSE [3.12] : 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 48F. Winds from the SW at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 50 | 43 71 | 49 71 | 48 57 | 50
Wind 4 mph SW 5 mph West 9 mph WSW 6 mph SW
Humidity 79% 44% 42% 75%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 29% 0% 0% 0%
Conditions Fog Clear Clear Clear
Sunrise & Sunset
5:48 AM
8:22 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [5.09], Average RMSE [3.33]
The National Weather Service forecast quality is poor. MaxT RMSE [6.24], Average RMSE [3.32] : Use NWS
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Thursday
clear Clear. High of 84F. Winds from the WSW at 5 to 10 mph.
Thursday 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 | 47 79 | 54 77 | 51 59 | 51
Wind 4 mph SW 4 mph West 8 mph WSW 6 mph SW
Humidity 79% 42% 38% 75%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 0% 0% 0% 0%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:48 AM
8:22 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [6.05], Average RMSE [3.66]
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Friday
clear Clear. High of 82F. Winds from the SW at 5 to 10 mph.
Friday Night
nt_clear Clear. Low of 55F. Winds from the WSW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 57 | 51 76 | 55 75 | 56 59 | 53
Wind 5 mph SW 6 mph WSW 10 mph WSW 9 mph WSW
Humidity 80% 48% 50% 81%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 0% 0% 0% 2%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:48 AM
8:22 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [6.45], Average RMSE [4.49]
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Saturday
clear Clear. High of 79F. Winds from the West at 5 to 15 mph.
Saturday Night
nt_clear Clear. Low of 50F. Winds from the West at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 57 | 54 74 | 52 69 | 49 56 | 51
Wind 7 mph WSW 7 mph West 13 mph West 8 mph West
Humidity 88% 45% 48% 79%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 5% 7% 9% 7%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:48 AM
8:22 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [7.18], Average RMSE [4.53]
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 50F. Winds from the West at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 54 | 51 74 | 63 68 | 51 56 | 46
Wind 6 mph West 7 mph WNW 13 mph WNW 9 mph West
Humidity 86% 67% 54% 69%
Chance of Precip. 0% 0% 0% 10%
Cloud Cover 5% 3% 1% 1%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:48 AM
8:22 PM
Source: BestForecast at 1:16 AM PDT on May 25, 2012
Descriptive Forecast
Monday
clear Clear. High of 79F. Winds from the West at 5 to 15 mph.
Monday Night
nt_clear Clear. Low of 50F. Winds from the West at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 52 | 47 74 | 61 74 | 54 57 | 47
Wind 6 mph West 7 mph WNW 13 mph West 8 mph West
Humidity 78% 62% 51% 68%
Chance of Precip. 10% 0% 0% 0%
Cloud Cover 1% 1% 1% %
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:48 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
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 53.1 °F
Richmond, CA 57.9 °F
Port Chicago, CA 63.0 °F
Marine Forecast
Astronomy
May. 25, 2012 Rise Set
Actual Time 5:50 AM PDT 8:19 PM PDT
Civil Twilight 5:20 AM PDT 8:50 PM PDT
Nautical Twilight 4:42 AM PDT 9:27 PM PDT
Astronomical Twilight 4:01 AM PDT 10:09 PM PDT
Moon 9:53 AM PDT No Moon Set
Length Of Visible Light 15h 29m
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
Ebbetts Pass 0 in 8700 ft
Rubicon #2 1 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
A Musical Journey From the '70s To Today 6:00 PM PDT 2012-05-25 Thunderstorm, 66°F
Company C Contemporary Ballet Presents Spring Program in Walnut Creek 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
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
Is your social media strategy destroying your business? 9:00 AM PDT 2012-05-28 Partly Cloudy, 56°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 05:03AM On Time
UPS946
Louisville, KY 		KOAK 05:15AM 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: 288° (WNW)
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
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
APRSWXNET Blackhawk CA, Danville, CA 46 °F 43 °F 40 °F 79% WNW  at  6 mph 0.00 in / hr 816 ft 4:19 AM PDT MADIS
Montair School, Danville, CA 46.7 °F 47 °F 38 °F 73% South  at  0.0 mph 0.00 in / hr 200 ft 4:39 AM PDT Rapid Fire  
FSTC - San Ramon, San Ramon, CA 47.2 °F 47 °F 40 °F 76% WNW  at  1.0 mph 0.00 in / hr 468 ft 4:31 AM PDT Normal
Hidden Hills Estates, Danville, CA 48.6 °F 49 °F 38 °F 68% West  at  2.5 mph 0.00 in / hr 709 ft 4:39 AM PDT Rapid Fire  
West Alamo - Litina, Alamo, CA 47.1 °F 47 °F 41 °F 78% NW  at  0.0 mph 0.00 in / hr 269 ft 4:38 AM PDT Rapid Fire  
Bollinger, San Ramon, CA 46.2 °F 46 °F 38 °F 73% NW  at  3.0 mph 0.00 in / hr 0 ft 4:35 AM PDT Normal  
Canyon Lakes, San Ramon, CA 47.0 °F 47 °F 38 °F 71% NW  at  1.0 mph 0.00 in / hr 492 ft 4:39 AM PDT Rapid Fire  
Alamo - Castle Crest, Alamo, CA 47.9 °F 48 °F 39 °F 70% WNW  at  0.0 mph 0.00 in / hr 344 ft 4:38 AM PDT Normal
K6WL - San Ramon, San Ramon, CA 47.4 °F 47 °F 41 °F 78% SSW  at  0.0 mph - / hr 502 ft 4:29 AM PDT Normal  
Bollinger Hills, San Ramon, CA 47.8 °F 48 °F 30 °F 51% North  at  0.0 mph 0.00 in / hr 400 ft 4:39 AM PDT Rapid Fire  
Old Ranch Estates, San Ramon, CA 47.8 °F 48 °F 41 °F 77% WSW  at  0.0 mph 0.00 in / hr 468 ft 4:39 AM PDT Rapid Fire
Downtown, Walnut Creek, CA 48.3 °F 48 °F 40 °F 72% SE  at  0.0 mph 0.00 in / hr 145 ft 4:30 AM PDT Normal  
APRSWXNET Walnut Creek CA U, Walnut Creek, CA 50 °F - 34 °F 55% West  at  3 mph 0.00 in / hr 114 ft 4:17 AM PDT MADIS
Montecito, San Ramon, CA 47.4 °F 46 °F 41 °F 79% SW  at  4.0 mph 0.00 in / hr 706 ft 4:35 AM PDT Normal  
Burton Valley, LAFAYETTE, CA 47.3 °F 44 °F 38 °F 71% SSW  at  6.0 mph 0.00 in / hr 587 ft 4:38 AM PDT Rapid Fire  
Woodlands, Walnut Creek, CA 50.0 °F - 37 °F 60% WSW  at  2.0 mph 0.00 in / hr 68 ft 4:35 AM PDT Normal
Claycord, Concord, CA 47.3 °F 47 °F 38 °F 71% WSW  at  0.0 mph 0.00 in / hr 292 ft 4:39 AM PDT Rapid Fire  
Pentozzi Treat & Cowell, Concord, CA 49.4 °F 49 °F 37 °F 63% WSW  at  0.0 mph 0.00 in / hr 250 ft 4:39 AM PDT Rapid Fire  
East Concord, Concord, CA 48.2 °F 48 °F 40 °F 72% SSE  at  0.0 mph 0.00 in / hr 362 ft 4:34 AM PDT Normal  
Larkey Park, Walnut Creek, CA 49.4 °F 49 °F 38 °F 64% West  at  0.0 mph 0.00 in / hr 150 ft 4:39 AM PDT Rapid Fire
KF6IIU, Lafayette, CA 47.7 °F 48 °F 39 °F 69% SW  at  0.0 mph 0.00 in / hr 400 ft 4:32 AM PDT Normal
Schaefer Ranch, Dublin, CA 44.8 °F 43 °F 35 °F 69% WSW  at  4.0 mph 0.00 in / hr 920 ft 4:38 AM PDT Rapid Fire  
Acalanes Ridge, Walnut Creek, CA 47.5 °F 48 °F 38 °F 69% WSW  at  1.1 mph 0.00 in / hr 307 ft 4:36 AM PDT Normal  
Camino Pablo, Moraga, CA 47.4 °F 47 °F 41 °F 78% South  at  0.0 mph 0.00 in / hr 502 ft 4:39 AM PDT Rapid Fire  
Palomares Hills, Castro Valley, CA 46.8 °F 47 °F 30 °F 53% NNW  at  0.0 mph 0.00 in / hr 803 ft 4:38 AM PDT Normal  
Lafayette near Palos Verde Mall, Lafayette, CA 47.9 °F 48 °F 39 °F 71% East  at  0.0 mph 0.00 in / hr 231 ft 4:35 AM PDT Normal  
Palos Verde Mall Area, Lafayette, CA 48.7 °F 49 °F 26 °F 40% SSE  at  0.0 mph 0.00 in / hr 204 ft 4:30 AM PDT Normal
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  
MesoWest Pleasanton , Pleasanton, CA 51 °F - - - WSW  at  7 mph 0.00 in / hr 99 ft 2:00 AM PDT MADIS
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 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
RAWS MALLORY RIDGE CA, Danville, CA 40 °F 33 °F 37 °F 89% West  at  13 mph 0.00 in / hr 1948 ft 4:02 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