Snow Squalls May Impact New Year's Eve Travel from the Great Lakes to the Mid-Atlantic; Heavy Rain & Isolated Severe Thunderstorms in Southern California

Snow squalls are likely to cross the Lower Great Lakes this evening and the Ohio Valley through the interior Northeast/northern Mid-Atlantic overnight, before potentially reaching the I-95 corridor from D.C. to New York City early New Year’s Day morning. Heavy rain and isolated severe thunderstorms will impact coastal southern California including Los Angeles tonight into early on New Year's Day. Read More >

Hazardous Weather Conditions

Coastal Flood Advisory until January 4, 02:00 PM PST

Current conditions at

LOS ALTOS (LOAC1)

Lat: 37.35472°NLon: 122.14167°WElev: 539.0ft.

49°F

9°C

Humidity	99%
Wind Speed	ENE 0 MPH
Barometer	NA
Dewpoint	49°F (9°C)
Visibility	NA
Last update	31 Dec 04:10 PM PST

More Information:

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

Extended Forecast for

Portola Valley CA

Coastal Flood Advisory December 31, 04:56pm until January 4, 02:00pm

Click here for hazard details and duration

Coastal Flood Advisory

Coastal Flood Advisory December 31, 04:56pm until January 4, 02:00pm
NOW until 2:00pm Sun
Coastal Flood Advisory
This Afternoon
High: 53 °F
Rain
Tonight
Low: 51 °F
Rain
New Year's Day
High: 60 °F
Showers
Thursday Night
Low: 49 °F
Rain Likely
then Chance
Rain
Friday
High: 61 °F
Rain Likely
Friday Night
Low: 52 °F
Rain
Saturday
High: 60 °F
Showers
Saturday Night
Low: 50 °F
Showers

Detailed Forecast

This Afternoon

Rain. Steady temperature around 53. North northeast wind around 5 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

Tonight

Rain. Steady temperature around 51. North northeast wind 5 to 9 mph becoming south southeast after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

New Year's Day

Rain before 1pm, then showers likely and possibly a thunderstorm between 1pm and 4pm, then rain likely and possibly a thunderstorm after 4pm. High near 60. South wind 13 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday Night

Rain likely, mainly before 7pm. Mostly cloudy, with a low around 49. South southeast wind 6 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Friday

Rain likely, mainly after 4pm. Mostly cloudy, with a high near 61. South southeast wind 8 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Friday Night

Rain. Low around 52. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

Saturday

Rain before 10am, then showers and possibly a thunderstorm between 10am and 1pm, then rain after 1pm. High near 60. Chance of precipitation is 90%.

Saturday Night

Showers and possibly a thunderstorm. Cloudy, with a low around 50.

Sunday

Rain. Cloudy, with a high near 58.

Sunday Night

Rain. Mostly cloudy, with a low around 48.

Monday

Rain likely. Mostly cloudy, with a high near 58.