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

Hayward, Hayward Air Terminal (KHWD)

Lat: 37.66083°NLon: 122.11833°WElev: 46.0ft.

Overcast

63°F

17°C

Humidity	77%
Wind Speed	SE 17 MPH
Barometer	29.59 in (1002.03 mb)
Dewpoint	55°F (13°C)
Visibility	10.00 mi
Last update	23 Dec 08:00 PM PST

More Information:

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

Extended Forecast for

2 Miles SW Union City CA

Flood Watch December 23, 08:25pm 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 23, 08:25pm until December 26, 10:00pm
Wind Advisory until December 24, 04:00am
NOW: Multiple hazards in effect
Click HERE for Details
Tonight
Low: 54 °F
Showers and
Breezy
Wednesday
High: 60 °F
Showers then
Severe
Thunderstorms
Wednesday Night
Low: 52 °F
Breezy.
Severe
Thunderstorms
then Showers
Christmas Day
High: 56 °F
Showers
Thursday Night
Low: 48 °F
Showers
Friday
High: 56 °F
Showers
Friday Night
Low: 44 °F
Showers
Likely
Saturday
High: 54 °F
Chance
Showers

Detailed Forecast

Tonight

Showers, with thunderstorms also possible after 1am. Low around 54. Breezy, with a south southeast wind 23 to 28 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.

Wednesday

Showers, with thunderstorms also possible after 4pm. Some of the storms could be severe. High near 60. South southeast wind 8 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Wednesday Night

Showers and possibly a thunderstorm before 10pm, then showers between 10pm and 4am, then showers and possibly a thunderstorm after 4am. Some of the storms could be severe. Low around 52. Breezy, with a south southeast wind around 22 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.

Christmas Day

Showers and possibly a thunderstorm before 7am, then showers between 7am and 1pm, then showers and possibly a thunderstorm after 1pm. High near 56. South wind around 18 mph, with gusts as high as 31 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. Low around 48. South wind 14 to 21 mph, with gusts as high as 33 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

Friday

Showers. High near 56. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

Friday Night

Showers likely and possibly a thunderstorm before 10pm, then a chance of showers and thunderstorms after 10pm. Mostly cloudy, with a low around 44. Chance of precipitation is 70%.

Saturday

A chance of showers, mainly before 10am. Mostly sunny, with a high near 54.

Saturday Night

Mostly clear, with a low around 37.

Sunday

Sunny, with a high near 54.

Sunday Night

Mostly clear, with a low around 37.

Monday

Sunny, with a high near 55.

Monday Night

Mostly clear, with a low around 39.