Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Hazardous Weather Conditions

Current conditions at

Half Moon Bay Airport (KHAF)

Lat: 37.5136°NLon: 122.4996°WElev: 65.0ft.

Mist

57°F

14°C

Humidity	100%
Wind Speed	S 41 MPH
Barometer	29.55 in (1000.68 mb)
Dewpoint	57°F (14°C)
Visibility	1.75 mi
Last update	25 Dec 01:55 AM PST

More Information:

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

Extended Forecast for

2 Miles NE Montara CA

Flood Watch December 25, 02:17am until December 26, 10:00pm

Flood Advisory until December 25, 04:00am

High Wind Warning December 25, 02:17am until December 25, 10:00am

Click here for hazard details and duration

Flood Watch

Flood Advisory

High Wind Warning

Flood Watch December 25, 02:17am until December 26, 10:00pm
Flood Advisory until December 25, 04:00am
High Wind Warning December 25, 02:17am until December 25, 10:00am
NOW: Multiple hazards in effect
Click HERE for Details
Overnight
Low: 51 °F
Severe
Thunderstorms
and Windy
Christmas Day
High: 55 °F
Severe
Thunderstorms
and Windy
Thursday Night
Low: 48 °F
Severe
Thunderstorms
and Windy
then Rain
Likely and
Breezy
Friday
High: 54 °F
Rain and
Breezy
Friday Night
Low: 46 °F
Rain Likely
then Chance
Rain
Saturday
High: 53 °F
Chance Rain
Saturday Night
Low: 42 °F
Mostly Clear
Sunday
High: 53 °F
Mostly Sunny

Detailed Forecast

Overnight

Showers and possibly a thunderstorm. Some of the storms could be severe. Low around 51. Windy, with a south wind 34 to 36 mph, with gusts as high as 55 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

Christmas Day

Showers and possibly a thunderstorm before 7am, then rain between 7am and 10am, then showers and possibly a thunderstorm after 10am. Some of the storms could be severe. High near 55. Windy, with a south southwest wind 25 to 30 mph, with gusts as high as 44 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

Thursday Night

Showers and possibly a thunderstorm before 10pm, then rain likely after 10pm. Some of the storms could be severe. Low around 48. Windy, with a southwest wind 23 to 30 mph, with gusts as high as 44 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

Friday

Rain. High near 54. Breezy, with a south southwest wind 15 to 23 mph, with gusts as high as 32 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

Friday Night

Rain likely, mainly before 10pm. Mostly cloudy, with a low around 46. West northwest wind around 14 mph, with gusts as high as 18 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Saturday

A 30 percent chance of rain, mainly before 10am. Mostly sunny, with a high near 53.

Saturday Night

Mostly clear, with a low around 42.

Sunday

Mostly sunny, with a high near 53.

Sunday Night

Mostly clear, with a low around 41.

Monday

Sunny, with a high near 55.

Monday Night

Mostly clear, with a low around 42.