Heavy Rainfall to Bring Flooding Threat to California; Heavy Snow in the Sierra

A strong atmospheric river will bring heavy rainfall to California through the holiday week. The heaviest rainfall is expected on Wednesday in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall is expected in the Sierra Nevada from the atmospheric river, raising concerns for major snow‐load impacts. Travel may be difficult to impossible over the passes. Read More >

Hazardous Weather Conditions

Current conditions at

BLACK DIAMOND (PIBC1)

Lat: 37.95°NLon: 121.88444°WElev: 1600.0ft.

60°F

16°C

Humidity	70%
Wind Speed	NNE 16 MPH
Barometer	NA
Dewpoint	50°F (10°C)
Visibility	NA
Last update	24 Dec 01:28 AM PST

More Information:

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

Extended Forecast for

3 Miles ENE Clayton CA

Flood Watch December 24, 02:25am until December 26, 10:00pm

Wind Advisory until December 24, 04:00am

Click here for hazard details and duration

Flood Watch

Wind Advisory

Flood Watch December 24, 02:25am until December 26, 10:00pm
Wind Advisory until December 24, 04:00am
NOW: Multiple hazards in effect
Click HERE for Details
Overnight
Low: 51 °F
Showers and
Breezy
Wednesday
High: 53 °F
Chance
Showers then
Severe
Thunderstorms
Wednesday Night
Low: 50 °F
Severe
Thunderstorms
and Breezy
then Showers
and Windy
Christmas Day
High: 52 °F
Showers and
Breezy
Thursday Night
Low: 47 °F
Showers
Friday
High: 50 °F
Showers
Friday Night
Low: 43 °F
Showers
Likely
Saturday
High: 48 °F
Slight Chance
Showers then
Partly Sunny

Detailed Forecast

Overnight

Showers. Low around 51. Breezy, with a south wind around 29 mph, with gusts as high as 47 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

Wednesday

A chance of showers before 4pm, then a chance of showers and thunderstorms between 4pm and 5pm, then showers and possibly a thunderstorm after 5pm. Some of the storms could be severe. Steady temperature around 53. South southeast wind 16 to 21 mph decreasing to 7 to 12 mph in the morning. Winds could gust as high as 32 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Wednesday Night

Showers and thunderstorms likely before 2am, then showers between 2am and 4am, then showers and possibly a thunderstorm after 4am. Some of the storms could be severe. Low around 50. Windy, with a south wind 17 to 22 mph increasing to 25 to 30 mph after midnight. Winds could gust as high as 50 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

Christmas Day

Showers and possibly a thunderstorm. High near 52. Breezy, with a south wind 22 to 25 mph, with gusts as high as 46 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

Thursday Night

Showers and possibly a thunderstorm. Low around 47. South wind 18 to 21 mph, with gusts as high as 36 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

Friday

Showers, with thunderstorms also possible after 4pm. High near 50. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday Night

Showers likely and possibly a thunderstorm before 10pm, then a chance of showers and thunderstorms, mainly between 10pm and 4am. Mostly cloudy, with a low around 43. Chance of precipitation is 60%.

Saturday

A slight chance of showers before 10am. Partly sunny, with a high near 48.

Saturday Night

Mostly clear, with a low around 38.

Sunday

Sunny, with a high near 45.

Sunday Night

Patchy frost. Otherwise, mostly clear, with a low around 36.

Monday

Patchy frost. Otherwise, mostly sunny, with a high near 47.

Monday Night

Partly cloudy, with a low around 37.