Winter Storm Bringing Widespread Hazardous Weather to the Eastern U.S.

A rapidly-intensifying winter storm continues to bring heavy snow, high winds, and blizzard conditions over the Upper Midwest and Great Lakes through today. An Arctic front will lead in a period of gusty to high winds and sharply colder temperatures over the entire eastern U.S. Heavy lake effect snow is then expected from Lakes Erie and Ontario through New Year's Day. Read More >

Hazardous Weather Conditions

Cold Weather Advisory in effect from December 30, 01:00 AM PST until December 30, 09:00 AM PST

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

49°F

9°C

Humidity	26%
Wind Speed	N 9 MPH
Barometer	NA
Dewpoint	16°F (-9°C)
Visibility	NA
Wind Chill	45°F (7°C)
Last update	29 Dec 01:40 PM PST

More Information:

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

Extended Forecast for

3 Miles NNE San Ramon CA

Cold Weather Advisory December 30, 01:00am until December 30, 09:00am

Click here for hazard details and duration

Cold Weather Advisory

This Afternoon
High: 57 °F
Sunny
Tonight
Low: 35 °F
Mostly Clear
then Patchy
Frost
Tuesday
High: 55 °F
Areas Frost
then Becoming
Cloudy
Tuesday Night
Low: 43 °F
Cloudy
Wednesday
High: 52 °F
Chance Rain
then Rain
Wednesday Night
Low: 46 °F
Rain and
Patchy Fog
New Year's Day
High: 56 °F
Rain
Thursday Night
Low: 51 °F
Rain Likely
Friday
High: 59 °F
Rain Likely

Detailed Forecast

This Afternoon

Sunny, with a high near 57. North northeast wind around 9 mph.

Tonight

Patchy frost after 2am. Otherwise, mostly clear, with a low around 35. Calm wind becoming north northeast around 6 mph after midnight.

Tuesday

Areas of frost before 9am. Otherwise, increasing clouds, with a high near 55. North northeast wind 6 to 8 mph.

Tuesday Night

Cloudy, with a low around 43. Northeast wind 7 to 10 mph.

Wednesday

Rain, mainly after 4pm. High near 52. Light north northeast wind becoming east northeast 5 to 9 mph in the afternoon. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

Wednesday Night

Rain. Patchy fog. Low around 46. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

New Year's Day

Rain. High near 56. Chance of precipitation is 90%.

Thursday Night

Rain likely. Mostly cloudy, with a low around 51.

Friday

Rain likely. Cloudy, with a high near 59.

Friday Night

Rain. Mostly cloudy, with a low around 46.

Saturday

Rain likely. Mostly cloudy, with a high near 56.