Critical Fire Weather in the Southern High Plains; Heavy Snow in the Great Lakes and Northeast U.S.

Gusty winds and low relative humidity will bring critical fire weather to the southern High Plains Friday. A winter storm will track across the Great Lakes and Northeast U.S. Friday into Saturday with areas of wintry mix and heavy snow from northern New York through southern Maine. Read More >

Hazardous Weather Conditions

Extreme Cold Warning in effect from February 20, 01:00 AM PST until February 20, 09:00 AM PST

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

Lat: 37.881699°NLon: 121.914173°WElev: 3904.0ft.

31°F

-1°C

Humidity	100%
Wind Speed	N 0 MPH
Barometer	NA
Dewpoint	31°F (-1°C)
Visibility	NA
Last update	19 Feb 06:40 PM PST

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

Clayton CA

Extreme Cold Warning February 20, 01:00am until February 20, 09:00am

Click here for hazard details and duration

Extreme Cold Warning

Tonight
Low: 34 °F
Clear then
Patchy Frost
Friday
High: 49 °F
Areas Frost
then Partly
Sunny
Friday Night
Low: 37 °F
Partly Cloudy
Saturday
High: 55 °F
Mostly Sunny
Saturday Night
Low: 46 °F
Slight Chance
Rain
Sunday
High: 62 °F
Chance Rain
Sunday Night
Low: 50 °F
Chance Rain
Monday
High: 64 °F
Chance Rain
Monday Night
Low: 55 °F
Rain

Detailed Forecast

Tonight

Patchy frost after midnight. Otherwise, mostly clear, with a low around 34. Southwest wind 12 to 17 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 30 mph.

Friday

Areas of frost before 7am. Otherwise, mostly sunny, with a high near 49. Light and variable wind becoming west southwest around 5 mph.

Friday Night

Partly cloudy, with a low around 37. Southeast wind around 6 mph.

Saturday

Mostly sunny, with a high near 55. South southeast wind 8 to 13 mph, with gusts as high as 22 mph.

Saturday Night

A 20 percent chance of rain after 10pm. Partly cloudy, with a low around 46. South southeast wind around 14 mph, with gusts as high as 25 mph. New precipitation amounts of less than a tenth of an inch possible.

Sunday

A 40 percent chance of rain. Partly sunny, with a high near 62. New precipitation amounts of less than a tenth of an inch possible.

Sunday Night

A 40 percent chance of rain. Mostly cloudy, with a low around 50.

Monday

A chance of rain. Mostly cloudy, with a high near 64.

Monday Night

Rain. Mostly cloudy, with a low around 55.

Tuesday

Rain. Mostly cloudy, with a high near 58.

Tuesday Night

Rain. Cloudy, with a low around 52.