Heavy Lake Effect Snow; Subfreezing Temperatures in the Eastern U.S.

A multi-day heavy lake effect snow event is expected downwind of Lakes Erie and Ontario through New Year's Day. The Arctic front will continue to bring increasing winds to the Northeast that will remain gusty. Subfreezing overnight low temperatures will be found as far south as the Gulf Coast. 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

LAS TRAMPAS (LTRC1)

Lat: 37.83389°NLon: 122.06694°WElev: 1760.0ft.

52°F

11°C

Humidity	37%
Wind Speed	E 18 MPH
Barometer	NA
Dewpoint	26°F (-3°C)
Visibility	NA
Last update	30 Dec 12:28 AM PST

More Information:

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

Extended Forecast for

3 Miles WSW San Ramon CA

Cold Weather Advisory until December 30, 09:00am

Click here for hazard details and duration

Cold Weather Advisory

Cold Weather Advisory until December 30, 09:00am
NOW until 9:00am Tue
Cold Weather Advisory
Overnight
Low: 39 °F
Areas Frost
Tuesday
High: 52 °F
Patchy Frost
then Mostly
Cloudy
Tuesday Night
Low: 43 °F
Mostly Cloudy
then Slight
Chance Rain
Wednesday
High: 50 °F
Rain and
Patchy Fog
Wednesday Night
Low: 46 °F
Rain and
Patchy Fog
New Year's Day
High: 55 °F
Rain and
Patchy Fog
Thursday Night
Low: 52 °F
Rain Likely
and Patchy
Fog
Friday
High: 56 °F
Rain

Detailed Forecast

Overnight

Areas of frost between 4am and 5am. Otherwise, mostly clear, with a steady temperature around 39. East northeast wind around 7 mph.

Tuesday

Patchy frost between 7am and 9am. Otherwise, partly sunny, with a high near 52. East northeast wind around 8 mph.

Tuesday Night

A 10 percent chance of rain after 4am. Cloudy, with a low around 43. East northeast wind around 8 mph.

Wednesday

Rain, mainly after 10am. Patchy fog after 2pm. High near 50. East northeast wind 6 to 8 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

Wednesday Night

Rain. Patchy fog before 10pm. Low around 46. East wind around 8 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

New Year's Day

Rain. Patchy fog after 10am. High near 55. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

Thursday Night

Rain likely. Patchy fog before 10pm. Otherwise, cloudy, with a low around 52. Chance of precipitation is 70%.

Friday

Rain. Cloudy, with a high near 56.

Friday Night

Rain. Cloudy, with a low around 47.

Saturday

Rain likely. Mostly cloudy, with a high near 52.

Saturday Night

Rain likely. Mostly cloudy, with a low around 44.