Saint Helena, CA

2:47 AM PDT on May 25, 2012 (GMT -0700)
Elev: 213 ft
Lon: 122.4° W
Lat: 38.5° N
Source
Rapid Fire Updates™
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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

Saint Helena Weather at a Glance

Updated 2:47 AM PDT
Weather Station - report
Saint Helena
Elevation
261 ft
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Now
Clear
Clear
Temperature
48.5 °F
Feels Like 48 °F
Wind(mph)
0.0
Sunrise / Set
5:50 AM
8:23 PM
Moon
Waxing Crescent
Tonight
Chance of Rain 39 °F
Chance of Rain
20% chance of precipitation
Friday
Thunderstorm 66 °F
T-storms
20% chance of precipitation
Friday Night
Thunderstorm 46 °F
T-storms
20% chance of precipitation
Saturday
Clear 68 | 45 °F
Clear
Sunday
Partly Cloudy 75 | 48 °F
Partly Cloudy
Monday
Partly Cloudy 68 | 45 °F
Partly Cloudy
Today is forecast to be Much Cooler than yesterday.
Conditions
Pressure
29.73 in
Visibility
10.0 miles
Clouds
Clear -
Moisture
Humidity
64%
Rainfall
0.00 in
Snow Depth
Not available.
METAR
METAR KSTS 250853Z AUTO 31011G17KT 10SM CLR 10/03 A2974 RMK AO2 SLP065 T01000028 56006
Don't speak METAR? Read our FAQ.
Weather Radio
Weather Radio Index
Temperature
Windchill
48 °F
Dew Point
37 °F
Wind
Speed / Dir
Calm
Wind Gust
0.0 mph
Health
UV
0 out of 16
Pollen
7.60 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 46F. Winds from the WNW at 5 to 10 mph. Chance of rain 20%.
Saturday
clear Clear. High of 68F. Winds from the WSW at 5 to 10 mph.
Saturday Night
nt_partlycloudy Partly cloudy. Low of 45F. Winds from the WSW at 5 to 15 mph.
Sunday
partlycloudy Partly cloudy in the morning, then clear. High of 75F. Winds from the WSW at 5 to 15 mph.
Sunday Night
nt_clear Partly cloudy. Fog overnight. Low of 48F. Winds from the West at 5 to 10 mph.
Monday
partlycloudy Clear. High of 68F. Winds from the WSW at 5 to 15 mph.
Monday Night
nt_clear Partly cloudy. Fog overnight. Low of 45F. Winds from the West at 5 to 10 mph.
Tuesday
partlycloudy Clear. High of 73F. Winds from the South at 5 to 10 mph.
Tuesday Night
nt_partlycloudy Partly cloudy. Low of 48F. Winds from the WNW at 5 to 10 mph.
Wednesday
clear Clear. High of 81F. Winds from the WSW at 5 to 10 mph.
Wednesday Night
nt_clear Clear. Low of 50F. Winds less than 5 mph.
Thursday
clear Clear. High of 90F. Winds from the WSW at 5 to 10 mph.
Thursday Night
nt_clear Clear. Low of 50F. Winds less than 5 mph.
Friday
clear Clear. High of 81F. Winds from the SSW at 5 to 10 mph.
Friday Night
nt_clear Clear. Low of 55F. 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 77F. 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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Forecast

View Calendar 10-Day Forecast for station KCAKENWO2

Friday, 25
Thunderstorm
66 | 46 °F
T-storms
Chance of
Precipitation
20%
Saturday, 26
Clear
68 | 45 °F
Clear
Chance of
Precipitation
10%
Sunday, 27
Partly Cloudy
75 | 48 °F
Partly Cloudy
Chance of
Precipitation
10%
Monday, 28
Partly Cloudy
68 | 45 °F
Partly Cloudy
Chance of
Precipitation
0%
Tuesday, 29
Partly Cloudy
73 | 48 °F
Partly Cloudy
Chance of
Precipitation
0%
Wednesday, 30
Clear
81 | 50 °F
Clear
Chance of
Precipitation
0%
Thursday, 31
Clear
90 | 50 °F
Clear
Chance of
Precipitation
0%
Friday, 1
Clear
81 | 55 °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 46F. Winds from the WNW at 5 to 10 mph. Chance of rain 20%.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 42 | 38 61 | 41 64 | 39 52 | 46
Wind 14 mph WNW 15 mph WNW 12 mph NW 6 mph WNW
Humidity 86% 48% 40% 80%
Chance of Precip. 20% 20% 20% 10%
Cloud Cover 65% 77% 57% 31%
Conditions Chance of Rain Thunderstorm Thunderstorm Partly Cloudy
Sunrise & Sunset
5:50 AM
8:23 PM
The quality of the forecasted high temperature for this day is good. MaxT RMSE [2.19], Average RMSE [2.05]
The National Weather Service forecast quality is fair. MaxT RMSE [2.81], Average RMSE [1.97] : Use NWS
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Saturday
clear Clear. High of 68F. Winds from the WSW at 5 to 10 mph.
Saturday Night
nt_partlycloudy Partly cloudy. Low of 45F. Winds from the WSW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 47 | 44 65 | 52 67 | 51 51 | 46
Wind 5 mph WNW 8 mph WSW 10 mph WSW 3 mph WSW
Humidity 86% 61% 57% 85%
Chance of Precip. 10% 10% 10% 10%
Cloud Cover 13% 3% 16% 38%
Conditions Clear Clear Clear Partly Cloudy
Sunrise & Sunset
5:49 AM
8:24 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [2.89], Average RMSE [2.83]
The National Weather Service forecast quality is fair. MaxT RMSE [3.33], Average RMSE [2.01] : 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 75F. Winds from the WSW at 5 to 15 mph.
Sunday Night
nt_clear 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 49 | 47 68 | 49 72 | 50 52 | 46
Wind 2 mph WSW 8 mph WSW 10 mph West 7 mph West
Humidity 88% 49% 46% 82%
Chance of Precip. 10% 10% 10% 0%
Cloud Cover 42% 13% 13% 0%
Conditions Partly Cloudy Clear Clear Clear
Sunrise & Sunset
5:49 AM
8:25 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [2.88], Average RMSE [2.26]
The National Weather Service forecast quality is poor. MaxT RMSE [3.87], Average RMSE [2.26] : Use NWS
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Monday
partlycloudy Clear. High of 68F. Winds from the WSW at 5 to 15 mph.
Monday Night
nt_clear Partly cloudy. Fog overnight. Low of 45F. Winds from the West at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 50 | 48 65 | 52 64 | 46 51 | 45
Wind 5 mph West 8 mph WSW 10 mph WSW 5 mph West
Humidity 90% 64% 51% 82%
Chance of Precip. 10% 0% 0% 0%
Cloud Cover 2% 0% 0% 0%
Conditions Fog Clear Clear Clear
Sunrise & Sunset
5:48 AM
8:25 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [3.12], Average RMSE [3.09]
The National Weather Service forecast quality is poor. MaxT RMSE [4.38], Average RMSE [2.38] : Use NWS
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Tuesday
partlycloudy Clear. High of 73F. Winds from the South at 5 to 10 mph.
Tuesday Night
nt_partlycloudy Partly cloudy. Low of 48F. Winds from the WNW at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 52 | 47 67 | 51 69 | 48 55 | 47
Wind 2 mph WNW 4 mph South 7 mph WSW 5 mph WNW
Humidity 87% 53% 48% 75%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 0% 0% 0% 99%
Conditions Fog Clear Clear Overcast
Sunrise & Sunset
5:48 AM
8:26 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [5.44], Average RMSE [2.62]
The National Weather Service forecast quality is poor. MaxT RMSE [4.81], Average RMSE [2.44] : Use NWS
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Wednesday
clear Clear. High of 81F. Winds from the WSW at 5 to 10 mph.
Wednesday Night
nt_clear Clear. Low of 50F. Winds less than 5 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 53 | 48 75 | 54 75 | 54 58 | 51
Wind 2 mph NW 4 mph SW 7 mph WSW 4 mph WNW
Humidity 84% 48% 45% 78%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 0% 0% 0% 0%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:48 AM
8:26 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [6.48], Average RMSE [3.01]
The National Weather Service forecast quality is poor. MaxT RMSE [5.22], Average RMSE [2.50] : Use NWS
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Thursday
clear Clear. High of 90F. Winds from the WSW at 5 to 10 mph.
Thursday Night
nt_clear Clear. Low of 50F. Winds less than 5 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 54 | 49 75 | 51 81 | 55 58 | 51
Wind 1 mph NNW 4 mph SW 7 mph WSW 4 mph West
Humidity 84% 43% 41% 77%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 0% 0% 0% 0%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:48 AM
8:26 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [5.92], Average RMSE [2.44]
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Friday
clear Clear. High of 81F. Winds from the SSW at 5 to 10 mph.
Friday Night
nt_clear Clear. Low of 55F. Winds from the West at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 53 | 49 74 | 54 75 | 51 56 | 51
Wind 2 mph West 5 mph South 9 mph WSW 8 mph West
Humidity 87% 50% 41% 77%
Chance of Precip. 0% 0% 0% 10%
Cloud Cover 0% 0% 0% 3%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:48 AM
8:26 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.81], Average RMSE [2.49]
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 | 53 55 | 48
Wind 6 mph West 7 mph West 12 mph West 9 mph WNW
Humidity 88% 53% 53% 78%
Chance of Precip. 10% 10% 10% 0%
Cloud Cover 7% 11% 16% 11%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:48 AM
8:26 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.79], Average RMSE [2.79]
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 53 | 48 69 | 58 70 | 53 55 | 44
Wind 7 mph WNW 9 mph WNW 13 mph WNW 10 mph WNW
Humidity 86% 66% 52% 67%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 6% 5% 3% 2%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:48 AM
8:26 PM
Source: BestForecast at 1:15 AM PDT on May 25, 2012
Descriptive Forecast
Monday
clear Clear. High of 77F. 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 53 | 45 72 | 58 73 | 53 55 | 44
Wind 8 mph NW 8 mph WNW 12 mph WNW 9 mph WNW
Humidity 76% 59% 48% 65%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 1% 1% 1% %
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:48 AM
8:26 PM
Scientific Forecaster Discussion — MOS Weather Graph
Nearby
History & Almanac
May 25, 2012 Max Temp Min Temp
Normal (KSTS) 76 °F 48 °F
Record (KSTS) 84 °F (2000) 41 °F (2008)
Yesterday 74 °F 51 °F
Yesterday's Heating Degree Days: 2
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 5:50 AM PDT 8:23 PM PDT
Civil Twilight 5:19 AM PDT 8:54 PM PDT
Nautical Twilight 4:41 AM PDT 9:32 PM PDT
Astronomical Twilight 3:59 AM PDT 10:15 PM PDT
Moon 9:54 AM PDT No Moon Set
Length Of Visible Light 15h 34m
Length of Day
14h 32m
Tomorrow will be 1m 20s longer.
Waxing Crescent, 17% of the Moon is Illuminated
Today
Waxing Crescent
May 28
First Quarter
Jun 4
Full
Jun 11
Last Quarter
Jun 19
New
Visit Astronomy
Today's Extremes
State Highs State Lows
82 °F
Needles
75 °F
Blythe
72 °F
Palm Springs
72 °F
Thermal
71 °F
Twentynine Palms
32 °F
Truckee-Tahoe
35 °F
Weaverville
36 °F
Mount Shasta
37 °F
Alturas
39 °F
South Lake Tahoe
Record Extremes
Snow Depth
Station Depth Elevation
CSS Lab 0 in 6900 ft
Ward Creek #3 0 in 6750 ft
Squaw Valley 1 in 8200 ft
Rubicon #2 0 in 7500 ft
Independence Lake 39 in 8450 ft
Snow Depth Reports — Snow Depth Map
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Travel Planning
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Nearby Events
Event Date Forecast
Nichelini 2011 Sauvignin Blanc Release & Food Pairing 11:00 AM PDT 2012-05-26 Partly Cloudy, 63°F
Event data courtesy eviesays.com
Aviation
City Temp. Conditions Updated
Santa Rosa 50 °F Clear 1:53 AM PDT
Petaluma 46 °F Clear 2:35 AM PDT
Napa County 48 °F Clear 1:54 AM PDT
Novato 50 °F Clear 2:35 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 (KSTS)
Wind Speed: 11.0 kts.
Wind Dir: 324° (NW)
Ceiling: Unlimited

METAR KSTS 250853Z AUTO 31011G17KT 10SM CLR 10/03 A2974 RMK AO2 SLP065 T01000028 56006

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
Saint Helena, CA 48.5 °F 48 °F 37 °F 64% NW  at  0.0 mph 0.00 in / hr 261 ft 2:47 AM PDT Normal  
In the middle of a 4 ac. Vineyard in the, St. Helena, CA 49.9 °F 50 °F 37 °F 62% NE  at  1.0 mph 0.00 in / hr 250 ft 2:02 AM PDT Normal  
Kenwood, Santa Rosa, CA 47.7 °F 48 °F 38 °F 69% NW  at  2.0 mph 0.00 in / hr 415 ft 2:46 AM PDT Normal  
Yountville Deli (Washington St), Yountville, CA 48.6 °F 48 °F 39 °F 69% NNW  at  3.5 mph 0.00 in / hr 98 ft 2:47 AM PDT Rapid Fire
Greater Calistoga, Calistoga, CA 44.6 °F 38 °F 40 °F 82% West  at  13.4 mph - / hr 988 ft 2:47 AM PDT Normal  
Calistoga Rd at Porter Creek Rd, Santa Rosa, CA 44.2 °F 44 °F 38 °F 78% ESE  at  0.0 mph 0.00 in / hr 1083 ft 2:41 AM PDT Normal  
Rincon Valley, Santa Rosa, CA 48.2 °F 48 °F 39 °F 71% NE  at  1.0 mph 0.00 in / hr 248 ft 2:46 AM PDT Rapid Fire  
Annadel Heights, Santa Rosa, CA 51.4 °F - 34 °F 52% NNW  at  5.8 mph 0.00 in / hr 340 ft 2:47 AM PDT Rapid Fire  
Fairway View Estates, Santa Rosa, CA 49.7 °F 50 °F 37 °F 62% North  at  0.0 mph 0.00 in / hr 320 ft 2:47 AM PDT Rapid Fire  
APRSWXNET Calistoga CA , Santa Rosa, CA 45 °F 45 °F 38 °F 76% NW  at  1 mph 0.00 in / hr 1099 ft 2:16 AM PDT MADIS
Oak Knoll, Napa, CA 48.0 °F 44 °F 39 °F 72% WNW  at  9.2 mph 0.00 in / hr 146 ft 2:47 AM PDT Rapid Fire  
Old Soda Springs Rd 850 ft, Napa, CA 46.5 °F 46 °F 37 °F 70% NNW  at  2.0 mph 0.00 in / hr 846 ft 2:47 AM PDT Rapid Fire  
West Valley, Sonoma, CA 49.4 °F 49 °F 37 °F 63% North  at  2.0 mph 0.00 in / hr 246 ft 2:45 AM PDT Normal  
Berryessa Estates, Pope Valley, CA 49.4 °F 48 °F 33 °F 54% West  at  4.0 mph 0.00 in / hr 500 ft 2:45 AM PDT Normal
Montgomery Village, Santa Rosa, CA 49.0 °F 46 °F 36 °F 61% WNW  at  7.5 mph 0.00 in / hr 196 ft 2:46 AM PDT Rapid Fire
Northeast, Santa Rosa, CA 50.1 °F - 37 °F 61% NW  at  2.0 mph 0.00 in / hr 0 ft 2:47 AM PDT Normal
Fountaingrove Village, Santa Rosa, CA 47.6 °F 48 °F 38 °F 68% North  at  0.0 mph 0.00 in / hr 555 ft 2:46 AM PDT Normal  
Berryessa Highlands, Napa, CA 47.6 °F 48 °F 40 °F 75% SW  at  2.0 mph 0.00 in / hr 820 ft 2:40 AM PDT Normal  
APRSWXNET Napa CA US, Napa, CA 52 °F - 39 °F 61% NW  at  5 mph 0.00 in / hr 78 ft 2:15 AM PDT MADIS
RAWS SANTA ROSA CA, Santa Rosa, CA 48 °F 42 °F 37 °F 65% West  at  15 mph 0.00 in / hr 599 ft 1:29 AM PDT MADIS
Ragle Ranch, Santa Rosa, CA 50.1 °F - 39 °F 66% NE  at  0.0 mph 0.00 in / hr 204 ft 2:45 AM PDT Normal  
SRJC-DP, Santa Rosa, CA 52.3 °F - 37 °F 56% WNW  at  2.2 mph 0.00 in / hr 187 ft 2:45 AM PDT Normal  
APRSWXNET Napa CA , Napa, CA 54 °F - 40 °F 59% WNW  at  0 mph 0.00 in / hr 109 ft 2:14 AM PDT MADIS
MesoWest Santa Rosa , Santa Rosa, CA 52 °F - - - WNW  at  11 mph 0.00 in / hr 161 ft 1:00 AM PDT MADIS
Just off the Plaza, Sonoma, CA 51.9 °F - 39 °F 61% West  at  9.0 mph 0.00 in / hr 80 ft 2:40 AM PDT Normal
Browns Valley, Napa, CA 48.1 °F 48 °F 37 °F 65% North  at  0.0 mph 0.00 in / hr 150 ft 2:47 AM PDT Rapid Fire  
Browns Valley, Napa, CA 48.2 °F 48 °F 40 °F 73% SSE  at  1.6 mph - / hr 384 ft 2:33 AM PDT Normal  
Monticello Road 900', Napa, CA 45.5 °F 46 °F 38 °F 74% North  at  0.0 mph 0.00 in / hr 950 ft 2:33 AM PDT Normal  
The Woods, Santa Rosa, CA 51.1 °F - 39 °F 63% North  at  0.0 mph 0.00 in / hr 0 ft 2:40 AM PDT Rapid Fire  
Las Posadas, Angwin, CA 41.5 °F 42 °F 36 °F 81% WSW  at  2.0 mph 0.00 in / hr 1706 ft 2:47 AM PDT Normal  
HADS ANGWIN PACIFIC UNION COLLEGE AT CA, Angwin, CA 42 °F 42 °F - - North  at  - 0.00 in / hr 1714 ft 2:00 AM PDT MADIS
Edgewood, Angwin, CA 41.8 °F 42 °F 35 °F 77% North  at  0.0 mph 0.00 in / hr 1766 ft 2:47 AM PDT Rapid Fire  
HADS SAINT HELENA 4WSW CA, Santa Rosa, CA - - - - North  at  - 0.00 in / hr 1779 ft 11:30 PM PDT MADIS
Diamond A Ranch Estates, Sonoma, CA 44.8 °F 43 °F 37 °F 74% NW  at  4.0 mph 0.00 in / hr 1300 ft 2:47 AM PDT Rapid Fire  
HADS NAPA 9NNE CA, Napa, CA 43 °F 43 °F - - North  at  - 0.00 in / hr 1660 ft 2:00 AM PDT MADIS
RAWS ATLAS PEAK CA, Napa, CA 42 °F 35 °F 36 °F 78% West  at  12 mph 0.00 in / hr 1934 ft 1:29 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