Sonoma Valley, CA

3:14 AM PDT on May 25, 2012 (GMT -0700)
Elev: 10 ft
Lon: 122.4° W
Lat: 38.2° 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

Sonoma Valley Weather at a Glance

Updated 3:14 AM PDT
Weather Station - report
Sophie's Ranch, Sonoma
Elevation
59 ft
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Now
Clear
Clear
Temperature
47.3 °F
Feels Like 47 °F
Wind(mph)
2.2
Sunrise / Set
5:51 AM
8:22 PM
Moon
Waxing Crescent
Tonight
Clear 48 °F
Clear
Friday
Thunderstorm 66 °F
T-storms
20% chance of precipitation
Friday Night
Thunderstorm 52 °F
T-storms
20% chance of precipitation
Saturday
Partly Cloudy 70 | 48 °F
Partly Cloudy
Sunday
Partly Cloudy 79 | 50 °F
Partly Cloudy
Monday
Clear 72 | 46 °F
Clear
Today is forecast to be Much Cooler than yesterday.
Conditions
Pressure
29.75 in
Visibility
10.0 miles
Clouds
Clear -
Moisture
Humidity
19%
Rainfall
0.00 in
Snow Depth
Not available.
METAR
METAR KO69 250955Z AUTO 28008G15KT 10SM CLR 08/04 A2975 RMK AO1
Don't speak METAR? Read our FAQ.
Weather Radio
Launch Weather Radio
Temperature
Windchill
47 °F
Dew Point
7 °F
Wind
Speed / Dir
2.2 mph from East
Wind Gust
5.8 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 66F. Breezy. Winds from the NW at 10 to 20 mph. Chance of rain 20%.
Friday Night
nt_tstorms Partly cloudy with thunderstorms and a chance of rain. Low of 52F. Winds from the WNW at 5 to 10 mph. Chance of rain 20%.
Saturday
partlycloudy Partly cloudy in the morning, then clear. High of 70F. Winds from the WSW at 5 to 15 mph.
Saturday Night
nt_partlycloudy Partly cloudy. Low of 48F. Winds from the WSW 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_clear Clear. Low of 50F. Winds from the West at 5 to 10 mph.
Monday
clear Clear. High of 72F. Winds from the WSW at 5 to 15 mph.
Monday Night
nt_clear Clear. Low of 46F. Winds from the West at 5 to 10 mph.
Tuesday
clear Clear. High of 73F. Winds from the WSW at 5 to 10 mph.
Tuesday Night
nt_partlycloudy Partly cloudy. Fog overnight. Low of 48F. Winds from the West at 5 to 10 mph.
Wednesday
partlycloudy Clear. High of 81F. Winds from the WSW at 5 to 10 mph.
Wednesday Night
nt_clear Clear. Low of 54F. Winds less than 5 mph.
Thursday
clear Clear. High of 86F. Winds from the SW at 5 to 10 mph.
Thursday Night
nt_clear Clear. Low of 54F. Winds less than 5 mph.
Friday
clear Clear. High of 81F. Winds from the SW at 5 to 10 mph.
Friday Night
nt_clear Clear. Low of 54F. Winds from the West at 5 to 15 mph.
Saturday
clear Partly cloudy. High of 77F. Winds from the West at 5 to 15 mph.
Saturday Night
nt_clear Clear. Low of 52F. Winds from the WNW at 5 to 15 mph.
Sunday
clear Clear. High of 77F. Winds from the WNW at 5 to 15 mph.
Sunday Night
nt_clear Clear. Low of 52F. Winds from the WNW at 5 to 15 mph.
Monday
clear Clear. High of 79F. Winds from the WNW at 5 to 15 mph.
Monday Night
nt_clear Clear. Low of 52F. Winds from the WNW at 5 to 15 mph.
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Updated:  
 
 

 

Forecast

View Calendar 10-Day Forecast for station KCASONOM6

Friday, 25
Thunderstorm
66 | 52 °F
T-storms
Chance of
Precipitation
20%
Saturday, 26
Partly Cloudy
70 | 48 °F
Partly Cloudy
Chance of
Precipitation
10%
Sunday, 27
Partly Cloudy
79 | 50 °F
Partly Cloudy
Chance of
Precipitation
10%
Monday, 28
Clear
72 | 46 °F
Clear
Chance of
Precipitation
0%
Tuesday, 29
Clear
73 | 48 °F
Clear
Chance of
Precipitation
0%
Wednesday, 30
Partly Cloudy
81 | 54 °F
Partly Cloudy
Chance of
Precipitation
0%
Thursday, 31
Clear
86 | 54 °F
Clear
Chance of
Precipitation
0%
Friday, 1
Clear
81 | 54 °F
Clear
Chance of
Precipitation
0%
Saturday, 2
Clear
77 | 52 °F
Clear
Chance of
Precipitation
0%
Sunday, 3
Clear
77 | 52 °F
Clear
Chance of
Precipitation
0%
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Friday
tstorms Mostly cloudy with thunderstorms and a chance of rain. High of 66F. Breezy. Winds from the NW at 10 to 20 mph. Chance of rain 20%.
Friday Night
nt_tstorms Partly cloudy with thunderstorms and a chance of rain. Low of 52F. Winds from the WNW at 5 to 10 mph. Chance of rain 20%.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 50 | 39 63 | 43 65 | 47 57 | 47
Wind 15 mph NW 12 mph WNW 10 mph NW 7 mph WNW
Humidity 64% 50% 51% 70%
Chance of Precip. 20% 20% 20% 10%
Cloud Cover 63% 77% 58% 32%
Conditions Chance of Rain Thunderstorm Thunderstorm Partly Cloudy
Sunrise & Sunset
5:51 AM
8:22 PM
The quality of the forecasted high temperature for this day is good. MaxT RMSE [1.54], Average RMSE [1.80]
The National Weather Service forecast quality is good. MaxT RMSE [1.62], Average RMSE [2.62] : Use NWS
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Saturday
partlycloudy Partly cloudy in the morning, then clear. High of 70F. Winds from the WSW at 5 to 15 mph.
Saturday Night
nt_partlycloudy Partly cloudy. Low of 48F. Winds from the WSW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 54 | 49 69 | 54 67 | 50 55 | 50
Wind 6 mph West 9 mph WSW 11 mph WSW 4 mph WSW
Humidity 86% 57% 54% 82%
Chance of Precip. 10% 10% 10% 10%
Cloud Cover 35% 6% 17% 53%
Conditions Partly Cloudy Clear Clear Partly Cloudy
Sunrise & Sunset
5:50 AM
8:23 PM
The quality of the forecasted high temperature for this day is good. MaxT RMSE [1.67], Average RMSE [1.84]
The National Weather Service forecast quality is good. MaxT RMSE [2.06], Average RMSE [2.57] : 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 79F. Winds from the WSW at 5 to 15 mph.
Sunday Night
nt_clear Clear. Low of 50F. Winds from the West at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 50 | 48 72 | 53 70 | 50 57 | 52
Wind 2 mph WSW 8 mph WSW 11 mph West 7 mph West
Humidity 88% 52% 47% 79%
Chance of Precip. 10% 10% 10% 0%
Cloud Cover 52% 13% 13% 0%
Conditions Partly Cloudy Clear Clear Clear
Sunrise & Sunset
5:50 AM
8:24 PM
The quality of the forecasted high temperature for this day is good. MaxT RMSE [1.75], Average RMSE [2.18]
The National Weather Service forecast quality is fair. MaxT RMSE [2.62], Average RMSE [2.79] : Use NWS
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Monday
clear Clear. High of 72F. Winds from the WSW at 5 to 15 mph.
Monday Night
nt_clear Clear. Low of 46F. Winds from the West at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 54 | 50 68 | 55 65 | 47 53 | 48
Wind 5 mph West 9 mph WSW 11 mph WSW 5 mph West
Humidity 87% 63% 53% 80%
Chance of Precip. 10% 0% 0% 0%
Cloud Cover 6% 0% 0% 0%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:49 AM
8:24 PM
The quality of the forecasted high temperature for this day is good. MaxT RMSE [2.23], Average RMSE [2.27]
The National Weather Service forecast quality is fair. MaxT RMSE [3.47], Average RMSE [2.93] : Use NWS
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Tuesday
clear Clear. High of 73F. Winds from the WSW at 5 to 10 mph.
Tuesday Night
nt_partlycloudy Partly cloudy. Fog overnight. Low of 48F. Winds from the West at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 48 | 45 68 | 51 70 | 50 54 | 46
Wind 2 mph West 4 mph SSW 8 mph WSW 5 mph West
Humidity 84% 52% 49% 72%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 1% 0% 0% 100%
Conditions Clear Clear Clear Overcast
Sunrise & Sunset
5:49 AM
8:25 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [3.71], Average RMSE [3.07]
The National Weather Service forecast quality is poor. MaxT RMSE [4.01], Average RMSE [2.90] : Use NWS
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Wednesday
partlycloudy Clear. High of 81F. Winds from the WSW at 5 to 10 mph.
Wednesday Night
nt_clear Clear. Low of 54F. Winds less than 5 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 52 | 47 73 | 54 77 | 54 60 | 51
Wind 3 mph West 4 mph SW 8 mph WSW 4 mph West
Humidity 88% 50% 45% 72%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 0% 0% 0% 0%
Conditions Fog Clear Clear Clear
Sunrise & Sunset
5:49 AM
8:25 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.54], Average RMSE [3.21]
The National Weather Service forecast quality is poor. MaxT RMSE [4.53], Average RMSE [2.95] : Use NWS
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Thursday
clear Clear. High of 86F. Winds from the SW at 5 to 10 mph.
Thursday Night
nt_clear Clear. Low of 54F. Winds less than 5 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 56 | 51 75 | 51 81 | 55 59 | 51
Wind 1 mph West 4 mph SW 8 mph WSW 5 mph West
Humidity 79% 41% 43% 73%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 0% 0% 0% 0%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:49 AM
8:25 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [5.26], Average RMSE [3.01]
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Friday
clear Clear. High of 81F. Winds from the SW at 5 to 10 mph.
Friday Night
nt_clear Clear. Low of 54F. Winds from the West at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 57 | 51 74 | 56 75 | 53 56 | 48
Wind 3 mph WSW 5 mph SSW 10 mph SW 9 mph West
Humidity 81% 51% 44% 70%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 0% 0% 0% 2%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:49 AM
8:25 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [3.89], Average RMSE [3.45]
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Saturday
clear Partly cloudy. High of 77F. Winds from the West at 5 to 15 mph.
Saturday Night
nt_clear Clear. Low of 52F. Winds from the WNW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 56 | 53 72 | 54 72 | 55 55 | 48
Wind 7 mph West 8 mph West 12 mph West 9 mph WNW
Humidity 87% 53% 54% 78%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 5% 9% 13% 9%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:49 AM
8:25 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.15], Average RMSE [3.32]
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Sunday
clear Clear. High of 77F. Winds from the WNW at 5 to 15 mph.
Sunday Night
nt_clear Clear. Low of 52F. Winds from the WNW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 54 | 49 70 | 58 71 | 54 55 | 45
Wind 7 mph WNW 9 mph WNW 14 mph WNW 10 mph WNW
Humidity 86% 67% 53% 67%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 6% 4% 3% 2%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:49 AM
8:25 PM
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Monday
clear Clear. High of 79F. Winds from the WNW at 5 to 15 mph.
Monday Night
nt_clear Clear. Low of 52F. Winds from the WNW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 54 | 46 72 | 58 72 | 53 55 | 44
Wind 8 mph WNW 8 mph WNW 13 mph WNW 9 mph WNW
Humidity 76% 60% 49% 66%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 1% 1% 1% %
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:49 AM
8:25 PM
Scientific Forecaster Discussion — MOS Weather Graph
Nearby
History & Almanac
May 25, 2012 Max Temp Min Temp
Normal (KAPC) 72 °F 48 °F
Record (KAPC) 80 °F (2000) 42 °F (2010)
Yesterday 75 °F 43 °F
Yesterday's Heating Degree Days: 6
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 63.0 °F
Marine Forecast
Astronomy
May. 25, 2012 Rise Set
Actual Time 5:51 AM PDT 8:22 PM PDT
Civil Twilight 5:20 AM PDT 8:53 PM PDT
Nautical Twilight 4:42 AM PDT 9:31 PM PDT
Astronomical Twilight 4:00 AM PDT 10:13 PM PDT
Moon 9:55 AM PDT No Moon Set
Length Of Visible Light 15h 32m
Length of Day
14h 31m
Tomorrow will be 1m 19s 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
Ward Creek #3 0 in 6750 ft
CSS Lab 0 in 6900 ft
Squaw Valley 1 in 8200 ft
Rubicon #2 0 in 7500 ft
Carson Pass 0 in 8500 ft
Snow Depth Reports — Snow Depth Map
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Travel & Activities
Travel Planning
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Nearby Events
Event Date Forecast
Recharge 6:00 PM PDT 2012-05-25 Thunderstorm, 58°F
FOXES IN THE HENHOUSE 5:00 PM PDT 2012-05-25 Thunderstorm, 59°F
IRA MARLOWE 9:00 PM PDT 2012-05-25 Thunderstorm, 53°F
Mother Hips 8:00 PM PDT 2012-05-26 Partly Cloudy, 55°F
The Adversary w/special guest Tony Gibson @ Hopmonk Tavern 9:00 PM PDT 2012-05-26 Partly Cloudy, 53°F
THE ADVERSARY with TONY GIBSON 9:00 PM PDT 2012-05-26 Partly Cloudy, 53°F
Event data courtesy eviesays.com
Aviation
City Temp. Conditions Updated
Petaluma 46 °F Clear 2:55 AM PDT
Novato 50 °F Clear 2:55 AM PDT
Napa County 48 °F Clear 2:54 AM PDT
Santa Rosa 49 °F Clear 2:53 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 (KO69)
Wind Speed: 8.0 kts.
Wind Dir: 89° (East)
Ceiling: Unlimited

METAR KO69 250955Z AUTO 28008G15KT 10SM CLR 08/04 A2975 RMK AO1

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
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
Toyota/Save Mart 350 12:19 PM PDT on June 24, 2012 Average High 81° F/ 27° 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
Sophie's Ranch, Sonoma, CA 47.3 °F 47 °F 7 °F 19% East  at  2.2 mph 0.00 in / hr 59 ft 3:14 AM PDT Rapid Fire  
SONOMA, CA 53.0 °F - 44 °F 72% NNE  at  10.0 mph 0.00 in / hr 79 ft 3:01 AM PDT Normal  
Just off the Plaza, Sonoma, CA 51.6 °F - 39 °F 61% West  at  7.0 mph 0.00 in / hr 80 ft 3:10 AM PDT Normal
West Valley, Sonoma, CA 49.1 °F 48 °F 37 °F 64% NE  at  4.0 mph 0.00 in / hr 246 ft 3:10 AM PDT Normal  
Browns Valley, Napa, CA 48.2 °F 48 °F 40 °F 72% SSE  at  1.1 mph - / hr 384 ft 3:04 AM PDT Normal  
Browns Valley, Napa, CA 46.6 °F 47 °F 36 °F 67% North  at  0.0 mph 0.00 in / hr 150 ft 3:14 AM PDT Rapid Fire  
APRSWXNET Napa CA , Napa, CA 53 °F - 39 °F 60% WNW  at  3 mph 0.00 in / hr 109 ft 3:04 AM PDT MADIS
Oak Knoll, Napa, CA 49.0 °F 45 °F 38 °F 67% NW  at  10.4 mph 0.00 in / hr 146 ft 3:14 AM PDT Rapid Fire  
Midtown, Petaluma, CA 46.5 °F 46 °F 42 °F 84% South  at  1.0 mph 0.00 in / hr 24 ft 3:14 AM PDT Normal  
APRSWXNET Napa CA US, Napa, CA 51 °F - 38 °F 62% NNW  at  2 mph 0.00 in / hr 78 ft 3:00 AM PDT MADIS
MesoWest PETALUMA - LYNCH CK , Petaluma, CA 47 °F 47 °F - - North  at  - 0.00 in / hr 9 ft 2:00 AM PDT MADIS
San Marin, Novato, CA 50.5 °F - 41 °F 69% West  at  4.5 mph 0.00 in / hr 66 ft 3:03 AM PDT Normal  
Pleasant Valley, Novato, CA 48.8 °F 46 °F 40 °F 73% WNW  at  6.0 mph 0.00 in / hr 213 ft 3:00 AM PDT Normal  
Near Hwy 37 and Sonama Blvd, Vallejo, CA 50.0 °F 48 °F 42 °F 75% WNW  at  5.1 mph 0.00 in / hr 0 ft 3:14 AM PDT Rapid Fire  
Redwood Business Park, Petaluma, CA 46.7 °F 43 °F 40 °F 77% North  at  7.0 mph 0.00 in / hr 39 ft 3:11 AM PDT Normal
Near River Park... KF6YAP, Vallejo, CA 48.3 °F 46 °F 40 °F 73% West  at  6.0 mph 0.00 in / hr 75 ft 3:14 AM PDT Rapid Fire
Ignacio, Loma Verde, Novato, CA 51.3 °F - 36 °F 55% SW  at  5.8 mph 0.00 in / hr 100 ft 3:01 AM PDT Normal
Yountville Deli (Washington St), Yountville, CA 47.7 °F 47 °F 38 °F 70% North  at  3.5 mph 0.00 in / hr 98 ft 3:14 AM PDT Rapid Fire
Volamus Vineyards, Penngrove, CA 46.4 °F 46 °F 40 °F 78% North  at  0.0 mph 0.00 in / hr 115 ft 3:12 AM PDT Rapid Fire
MesoWest Vallejo , Vallejo, CA 51 °F - 41 °F 68% West  at  10 mph 0.00 in / hr 98 ft 2:00 AM PDT MADIS
Old Soda Springs Rd 850 ft, Napa, CA 46.3 °F 46 °F 37 °F 70% WNW  at  0.0 mph 0.00 in / hr 846 ft 3:14 AM PDT Rapid Fire  
Monticello Road 900', Napa, CA 44.7 °F 45 °F 37 °F 75% North  at  0.0 mph 0.00 in / hr 950 ft 3:02 AM PDT Normal  
Middle Two Rock, Petaluma, CA 45.1 °F 39 °F 42 °F 88% West  at  14.0 mph 0.00 in / hr 367 ft 3:12 AM PDT Normal  
Kenwood, Santa Rosa, CA 46.7 °F 47 °F 38 °F 71% WNW  at  1.0 mph 0.00 in / hr 415 ft 3:12 AM PDT Normal  
Hiddenbrooke, Vallejo, CA 48.0 °F 44 °F 40 °F 73% West  at  9.6 mph 0.00 in / hr 341 ft 3:14 AM PDT Rapid Fire
Venetia Valley K-8 School, San Rafael, CA 49.9 °F 50 °F 43 °F 76% West  at  0.0 mph 0.00 in / hr 23 ft 3:14 AM PDT Rapid Fire
MAP MEACHUMLFL (P196), CA , Cotati, CA 46 °F 43 °F 41 °F 83% NW  at  6 mph 0.00 in / hr 400 ft 2:00 AM PDT MADIS
Diamond A Ranch Estates, Sonoma, CA 44.8 °F 45 °F 37 °F 73% WNW  at  1.0 mph 0.00 in / hr 1300 ft 3:14 AM PDT Rapid Fire  
RAWS BIG ROCK CA, San Rafael, CA 45 °F 45 °F 39 °F 78% West  at  0 mph 0.00 in / hr 1500 ft 2:33 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