Greenfield, CA

12:06 AM PDT on May 25, 2012 (GMT -0700)
Elev: 515 ft
Lon: 121.3° W
Lat: 36.3° 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

Greenfield Weather at a Glance

Updated 12:06 AM PDT
Elevation
309 ft
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Now
Clear
Clear
Temperature
49.4 °F
Feels Like 48 °F
Wind(mph)
4.0
Sunrise / Set
5:51 AM
8:13 PM
Moon
Waxing Crescent
Tonight
Partly Cloudy 50 °F
Partly Cloudy
Friday
Thunderstorm 61 °F
T-storms
20% chance of precipitation
Friday Night
Thunderstorm 48 °F
T-storms
20% chance of precipitation
Saturday
Partly Cloudy 63 | 48 °F
Partly Cloudy
Sunday
Partly Cloudy 64 | 48 °F
Partly Cloudy
Monday
Fog 64 | 45 °F
Fog
Today is forecast to be Cooler than yesterday.
Conditions
Pressure
29.85 in
Visibility
9.0 miles
Clouds
Clear -
Moisture
Humidity
78%
Rainfall
0.00 in
Snow Depth
Not available.
METAR
METAR KSNS 250653Z AUTO 23009KT 9SM CLR 11/07 A2982 RMK AO2 SLP107 T01060067 TSNO
Don't speak METAR? Read our FAQ.
Weather Radio
Launch Weather Radio
Temperature
Windchill
48 °F
Dew Point
43 °F
Wind
Speed / Dir
4.0 mph from NNW
Wind Gust
8.0 mph
Health
UV
0 out of 16
Pollen
5.90 out of 12
Pollen Forecast
Air Quality
Not available.
Flu Activity
Local Activity
View Flu Map
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Source: BestForecast
Descriptive Forecast
Friday
tstorms Mostly cloudy with a chance of rain in the morning, then partly cloudy with thunderstorms and a chance of rain. High of 61F. Windy. Winds from the WNW at 25 to 30 mph with gusts to 35 mph. Chance of rain 20%.
Friday Night
nt_tstorms Partly cloudy with thunderstorms and a chance of rain in the evening, then overcast. Low of 48F. Winds from the WSW at 5 to 15 mph. Chance of rain 20%.
Saturday
partlycloudy Overcast in the morning, then partly cloudy. High of 63F. Winds from the West at 10 to 15 mph.
Saturday Night
nt_mostlycloudy Partly cloudy in the evening, then overcast. Low of 48F. Winds from the WSW at 5 to 15 mph.
Sunday
partlycloudy Overcast in the morning, then clear. High of 64F. Winds from the West at 5 to 15 mph.
Sunday Night
nt_partlycloudy Partly cloudy in the evening, then overcast. Fog overnight. Low of 48F. Winds from the NW at 5 to 10 mph.
Monday
partlycloudy Mostly cloudy in the morning, then partly cloudy. Fog early. High of 64F. Winds from the WNW at 5 to 15 mph.
Monday Night
nt_partlycloudy Partly cloudy in the evening, then mostly cloudy. Fog overnight. Low of 45F. Winds from the WNW at 5 to 10 mph.
Tuesday
partlycloudy Partly cloudy in the morning, then clear. High of 64F. Winds from the WNW at 5 to 15 mph.
Tuesday Night
nt_clear Clear. Fog overnight. Low of 46F. Winds less than 5 mph.
Wednesday
partlycloudy Partly cloudy. High of 70F. Winds from the WNW at 5 to 10 mph.
Wednesday Night
nt_partlycloudy Partly cloudy. Low of 52F. Winds less than 5 mph.
Thursday
partlycloudy Partly cloudy. High of 73F. Winds from the West at 5 to 10 mph.
Thursday Night
nt_partlycloudy Partly cloudy. Low of 50F. Winds less than 5 mph.
Friday
partlycloudy Partly cloudy. High of 73F. Winds from the WNW at 5 to 15 mph.
Friday Night
nt_partlycloudy Partly cloudy. Low of 54F. Winds from the WNW at 5 to 15 mph.
Saturday
clear Clear. High of 68F. Winds from the NW at 5 to 15 mph.
Saturday Night
nt_clear Partly cloudy. Low of 52F. Winds from the WNW at 5 to 15 mph.
Sunday
partlycloudy Partly cloudy. High of 68F. Winds from the NW at 5 to 15 mph.
Sunday Night
nt_clear Clear. Low of 52F. Winds from the NW at 5 to 15 mph.
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Forecast

View Calendar 10-Day Forecast for station KSNS

Friday, 25
Thunderstorm
61 | 48 °F
T-storms
Chance of
Precipitation
20%
Saturday, 26
Partly Cloudy
63 | 48 °F
Partly Cloudy
Chance of
Precipitation
0%
Sunday, 27
Partly Cloudy
64 | 48 °F
Partly Cloudy
Chance of
Precipitation
0%
Monday, 28
Fog
64 | 45 °F
Fog
Chance of
Precipitation
0%
Tuesday, 29
Partly Cloudy
64 | 46 °F
Partly Cloudy
Chance of
Precipitation
0%
Wednesday, 30
Partly Cloudy
70 | 52 °F
Partly Cloudy
Chance of
Precipitation
0%
Thursday, 31
Partly Cloudy
73 | 50 °F
Partly Cloudy
Chance of
Precipitation
0%
Friday, 1
Partly Cloudy
73 | 54 °F
Partly Cloudy
Chance of
Precipitation
0%
Saturday, 2
Clear
68 | 52 °F
Clear
Chance of
Precipitation
0%
Sunday, 3
Partly Cloudy
68 | 52 °F
Partly Cloudy
Chance of
Precipitation
0%
Source: BestForecast at 6:55 PM PDT on May 24, 2012
Descriptive Forecast
Friday
tstorms Mostly cloudy with a chance of rain in the morning, then partly cloudy with thunderstorms and a chance of rain. High of 61F. Windy. Winds from the WNW at 25 to 30 mph with gusts to 35 mph. Chance of rain 20%.
Friday Night
nt_tstorms Partly cloudy with thunderstorms and a chance of rain in the evening, then overcast. Low of 48F. Winds from the WSW at 5 to 15 mph. Chance of rain 20%.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 51 | 47 61 | 42 58 | 43 50 | 46
Wind 13 mph West 27 mph WNW 18 mph West 10 mph WSW
Humidity 89% 49% 59% 87%
Chance of Precip. 10% 20% 20% 10%
Cloud Cover 57% 83% 62% 40%
Conditions Partly Cloudy Chance of Rain Thunderstorm Partly Cloudy
Sunrise & Sunset
5:51 AM
8:13 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [3.07], Average RMSE [1.80]
The National Weather Service forecast quality is fair. MaxT RMSE [3.06], Average RMSE [1.57] : Use NWS
Source: BestForecast at 6:55 PM PDT on May 24, 2012
Descriptive Forecast
Saturday
partlycloudy Overcast in the morning, then partly cloudy. High of 63F. Winds from the West at 10 to 15 mph.
Saturday Night
nt_mostlycloudy Partly cloudy in the evening, then overcast. Low of 48F. Winds from the WSW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 49 | 47 62 | 52 58 | 49 51 | 47
Wind 7 mph WSW 10 mph West 10 mph West 5 mph WSW
Humidity 92% 70% 72% 87%
Chance of Precip. 10% 10% 0% 0%
Cloud Cover 90% 100% 32% 52%
Conditions Overcast Overcast Partly Cloudy Partly Cloudy
Sunrise & Sunset
5:51 AM
8:13 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [3.19], Average RMSE [1.82]
The National Weather Service forecast quality is fair. MaxT RMSE [3.32], Average RMSE [1.70] : Use NWS
Source: BestForecast at 6:55 PM PDT on May 24, 2012
Descriptive Forecast
Sunday
partlycloudy Overcast in the morning, then clear. High of 64F. Winds from the West at 5 to 15 mph.
Sunday Night
nt_partlycloudy Partly cloudy in the evening, then overcast. Fog overnight. Low of 48F. Winds from the NW at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 50 | 47 61 | 48 62 | 46 52 | 46
Wind 2 mph WSW 9 mph WNW 10 mph West 6 mph NW
Humidity 88% 60% 55% 84%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 66% 44% 0% 5%
Conditions Mostly Cloudy Partly Cloudy Clear Clear
Sunrise & Sunset
5:50 AM
8:14 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [3.02], Average RMSE [1.83]
The National Weather Service forecast quality is fair. MaxT RMSE [3.35], Average RMSE [1.75] : Use NWS
Source: BestForecast at 6:55 PM PDT on May 24, 2012
Descriptive Forecast
Monday
partlycloudy Mostly cloudy in the morning, then partly cloudy. Fog early. High of 64F. Winds from the WNW at 5 to 15 mph.
Monday Night
nt_partlycloudy Partly cloudy in the evening, then mostly cloudy. Fog overnight. Low of 45F. Winds from the WNW at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 51 | 47 60 | 45 61 | 46 50 | 45
Wind 6 mph NW 10 mph WNW 11 mph WNW 5 mph WNW
Humidity 89% 55% 59% 85%
Chance of Precip. 10% 0% 0% 0%
Cloud Cover 97% 56% 1% 24%
Conditions Fog Partly Cloudy Clear Fog
Sunrise & Sunset
5:50 AM
8:15 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [3.35], Average RMSE [1.96]
The National Weather Service forecast quality is fair. MaxT RMSE [2.79], Average RMSE [1.92] : Use NWS
Source: BestForecast at 6:55 PM PDT on May 24, 2012
Descriptive Forecast
Tuesday
partlycloudy Partly cloudy in the morning, then clear. High of 64F. Winds from the WNW at 5 to 15 mph.
Tuesday Night
nt_clear Clear. Fog overnight. Low of 46F. Winds less than 5 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 50 | 47 61 | 45 62 | 45 51 | 46
Wind 4 mph WNW 8 mph WNW 10 mph WNW 4 mph WNW
Humidity 88% 57% 56% 83%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 75% 58% 1% 1%
Conditions Fog Partly Cloudy Clear Fog
Sunrise & Sunset
5:49 AM
8:15 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.48], Average RMSE [2.16]
The National Weather Service forecast quality is fair. MaxT RMSE [3.06], Average RMSE [1.74] : Use NWS
Source: BestForecast at 6:55 PM PDT on May 24, 2012
Descriptive Forecast
Wednesday
partlycloudy Partly cloudy. High of 70F. Winds from the WNW at 5 to 10 mph.
Wednesday Night
nt_partlycloudy Partly cloudy. Low of 52F. Winds less than 5 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 52 | 49 65 | 51 63 | 49 54 | 48
Wind 2 mph NW 7 mph WNW 8 mph West 2 mph West
Humidity 87% 58% 61% 79%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 57% 25% 0% 23%
Conditions Fog Clear Clear Clear
Sunrise & Sunset
5:49 AM
8:15 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.59], Average RMSE [1.77]
The National Weather Service forecast quality is poor. MaxT RMSE [3.53], Average RMSE [1.53] : Use NWS
Source: BestForecast at 6:55 PM PDT on May 24, 2012
Descriptive Forecast
Thursday
partlycloudy Partly cloudy. High of 73F. Winds from the West at 5 to 10 mph.
Thursday Night
nt_partlycloudy Partly cloudy. Low of 50F. Winds less than 5 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 55 | 51 66 | 53 63 | 50 53 | 49
Wind 2 mph West 7 mph West 8 mph West 4 mph West
Humidity 86% 59% 61% 80%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 43% 24% 1% 17%
Conditions Partly Cloudy Clear Clear Clear
Sunrise & Sunset
5:49 AM
8:15 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.27], Average RMSE [2.12]
Source: BestForecast at 6:55 PM PDT on May 24, 2012
Descriptive Forecast
Friday
partlycloudy Partly cloudy. High of 73F. Winds from the WNW at 5 to 15 mph.
Friday Night
nt_partlycloudy Partly cloudy. Low of 54F. Winds from the WNW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 54 | 50 69 | 55 64 | 53 58 | 53
Wind 4 mph West 7 mph NW 11 mph WNW 8 mph WNW
Humidity 84% 61% 64% 81%
Chance of Precip. 0% 10% 10% 10%
Cloud Cover 35% 35% 12% 40%
Conditions Partly Cloudy Partly Cloudy Clear Partly Cloudy
Sunrise & Sunset
5:49 AM
8:15 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.99], Average RMSE [2.89]
Source: BestForecast at 6:55 PM PDT on May 24, 2012
Descriptive Forecast
Saturday
clear Clear. High of 68F. Winds from the NW at 5 to 15 mph.
Saturday Night
nt_clear Partly cloudy. Low of 52F. Winds from the WNW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 56 | 51 67 | 58 65 | 54 55 | 49
Wind 7 mph NW 8 mph NW 12 mph WNW 9 mph WNW
Humidity 84% 73% 66% 79%
Chance of Precip. 10% 0% 0% 10%
Cloud Cover 21% 11% 1% 17%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:49 AM
8:15 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [5.07], Average RMSE [2.96]
Source: BestForecast at 6:55 PM PDT on May 24, 2012
Descriptive Forecast
Sunday
partlycloudy Partly cloudy. High of 68F. Winds from the NW at 5 to 15 mph.
Sunday Night
nt_clear Clear. Low of 52F. Winds from the NW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 54 | 51 64 | 53 66 | 49 55 | 43
Wind 8 mph NW 10 mph NW 14 mph NW 10 mph NW
Humidity 87% 68% 54% 64%
Chance of Precip. 10% 0% 0% 0%
Cloud Cover 33% 20% 8% 4%
Conditions Partly Cloudy Clear Clear Clear
Sunrise & Sunset
5:49 AM
8:15 PM
Source: BestForecast at 6:55 PM PDT on May 24, 2012
Descriptive Forecast
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 54 | 44 65 | 49 66 | 46 55 | 41
Wind 8 mph NW 9 mph NW 13 mph NW 9 mph NW
Humidity 70% 57% 48% 60%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 0% % % %
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:49 AM
8:15 PM
Scientific Forecaster Discussion — MOS Weather Graph
Nearby
History & Almanac
May 25, 2012 Max Temp Min Temp
Normal (KSNS) 68 °F 51 °F
Record (KSNS) 96 °F (1951) 37 °F (1935)
Yesterday 66 °F 50 °F
Yesterday's Heating Degree Days: 7
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
Coastal Water Temperatures
Place Temperature
Monterey, CA 54.0 °F
Port San Luis, CA 52.0 °F
Marine Forecast
Astronomy
May. 25, 2012 Rise Set
Actual Time 5:51 AM PDT 8:13 PM PDT
Civil Twilight 5:22 AM PDT 8:42 PM PDT
Nautical Twilight 4:46 AM PDT 9:18 PM PDT
Astronomical Twilight 4:06 AM PDT 9:58 PM PDT
Moon 9:54 AM PDT 11:55 PM PDT
Length Of Visible Light 15h 20m
Length of Day
14h 21m
Tomorrow will be 1m 13s longer.
Waxing Crescent, 16% 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
99 °F
Needles
98 °F
Palm Springs
98 °F
Thermal
96 °F
Imperial
96 °F
Blythe
24 °F
Truckee-Tahoe
28 °F
South Lake Tahoe
30 °F
Alturas
35 °F
Weaverville
36 °F
Montague
Record Extremes
Snow Depth
Station Depth Elevation
Leavitt Lake 19 in 9400 ft
Sonora Pass 0 in 8800 ft
Leavitt Meadows 1 in 7200 ft
Summit Meadow 1 in 9122 ft
Ebbetts Pass 0 in 8700 ft
Snow Depth Reports — Snow Depth Map
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Travel Planning
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Nearby Events
Event Date Forecast
No events within 10 mi of location. View all events.
Event data courtesy eviesays.com
Aviation
City Temp. Conditions Updated
Salinas 51 °F Clear 11:53 PM PDT
Monterey 51 °F Overcast 11:54 PM PDT
Watsonville 53 °F Clear 11:53 PM 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 (KSNS)
Wind Speed: 9.0 kts.
Wind Dir: 329° (NNW)
Ceiling: Unlimited

METAR KSNS 250653Z AUTO 23009KT 9SM CLR 11/07 A2982 RMK AO2 SLP107 T01060067 TSNO

View all Reports & Maps
Sports
Event Date Forecast
Angels vs. Mariners 7:10 PM PDT on May 24, 2012 Chance of Rain, 54 °F
Royals vs. Orioles 7:05 PM EDT on May 25, 2012 Partly Cloudy, 81 °F
Event Date Forecast
Athletic vs. Barcelona 12:00 PM CEST on May 25, 2012 Clear, High 84° F/ 29° C
Barcelona vs. Athletic 10:00 PM CEST on May 25, 2012 Clear, High 86° F/ 30° C
Event Date Forecast
Coca-Cola 600 6:16 PM EDT on May 27, 2012 Chance of a Thunderstorm, 85 °F
FedEx 400 benefiting Autism Speaks 1:15 PM EDT on June 03, 2012 Average High 79° F/ 26° C
Event Date Forecast
Crowne Plaza Invitational at Colonial 8:30 AM CDT on May 25, 2012 Overcast, 76 °F
Crowne Plaza Invitational at Colonial 8:30 AM CDT on May 26, 2012 Mostly Cloudy, 74 °F
View all Sports Weather
Weather Stations
Station Location Temp. Windchill Dew Point Humidity Wind Precipitation Elevation Updated Type Website
HADS ARROYO SECO RVR BLO VAQUERO CK N CA, Greenfield, CA 60 °F - - - North  at  - 0.00 in / hr 338 ft 11:00 PM PDT MADIS
North West King City, King City, CA 49.4 °F 48 °F 43 °F 78% NNW  at  4.0 mph 0.00 in / hr 309 ft 12:06 AM PDT Rapid Fire  
RAWS PINNACLES CA, Paicines, CA 47 °F 44 °F 40 °F 77% NNW  at  6 mph 0.00 in / hr 1321 ft 11:37 PM PDT MADIS
MAP LLANOGRAND (P174), CA , King City, CA 49 °F 47 °F 38 °F 64% NNE  at  5 mph 0.00 in / hr 1322 ft 11:00 PM PDT MADIS
MesoWest Pinnacles National Monument , Paicines, CA 48 °F 46 °F 40 °F 72% North  at  5 mph 0.00 in / hr 1099 ft 11:00 PM PDT MADIS
RAWS FORT HUNTER LIGGET CA, Jolon, CA 55 °F - 19 °F 24% NW  at  3 mph 0.00 in / hr 1100 ft 11:13 PM PDT MADIS
HADS SAN BENITO RVR NR WILLOW CK NR P CA, Paicines, CA 52 °F - - - North  at  - 0.00 in / hr 925 ft 11:15 PM PDT MADIS
MesoWest WHALE POINT , Big Sur, CA 52 °F - 36 °F 54% NNW  at  8 mph 0.00 in / hr 620 ft 10:30 PM PDT MADIS
MesoWest Hastings Natural History Reserv, Carmel Valley, CA 45 °F 45 °F 39 °F 80% West  at  1 mph 0.00 in / hr 1791 ft 11:40 PM PDT MADIS
RAWS HASTINGS CA, Carmel Valley, CA 44 °F 39 °F 39 °F 82% NW  at  10 mph 0.00 in / hr 1884 ft 11:11 PM PDT MADIS
MesoWest HIGHLANDS PEAK , Big Sur, CA 50 °F 45 °F 17 °F 27% WNW  at  12 mph 0.00 in / hr 2490 ft 10:40 PM 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