Hawaii and Guam Concerns; Record Warmth Spreads Eastward; Heavy Snow for Sierra-Nevada; Severe Weather for the Plains

A very active spring pattern with tropical concerns across the Pacific. Heavy rainfall will continue to impact Hawaii this weekend. Meanwhile we continue to monitor a developing typhoon that may affect Guam into early next week. For the Lower 48, heavy snow for mountains of California this weekend, increase threat for severe thunderstorms next week for the Plains and record warmth spreads east. Read More >

Current conditions at

LOS ALTOS (LOAC1)

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

51°F

11°C

Humidity	77%
Wind Speed	WSW 5 MPH
Barometer	NA
Dewpoint	44°F (7°C)
Visibility	NA
Last update	11 Apr 08:10 PM PDT

More Information:

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

Extended Forecast for

5 Miles WSW Cupertino CA

Tonight
Low: 47 °F
Heavy Rain
Sunday
High: 53 °F
Showers
Sunday Night
Low: 46 °F
Chance
Showers
Monday
High: 59 °F
Mostly Sunny
Monday Night
Low: 49 °F
Mostly Clear
Tuesday
High: 61 °F
Mostly Sunny
Tuesday Night
Low: 47 °F
Mostly Clear
Wednesday
High: 61 °F
Sunny
Wednesday Night
Low: 50 °F
Partly Cloudy

Detailed Forecast

Tonight

Showers and thunderstorms likely, mainly before 2am, then showers likely and possibly a thunderstorm after 4am. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 47. Southwest wind around 11 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.

Sunday

Showers and thunderstorms before 10am, then showers likely and possibly a thunderstorm between 10am and 4pm, then a chance of showers and thunderstorms after 4pm. High near 53. Southwest wind 9 to 11 mph, with gusts as high as 28 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

Sunday Night

A 30 percent chance of showers. Mostly cloudy, with a low around 46. West southwest wind 3 to 8 mph. Winds could gust as high as 18 mph. New precipitation amounts of less than a tenth of an inch possible.

Monday

Mostly sunny, with a high near 59. West northwest wind 3 to 8 mph.

Monday Night

Mostly clear, with a low around 49. West northwest wind around 8 mph, with gusts as high as 21 mph.

Tuesday

Mostly sunny, with a high near 61.

Tuesday Night

Mostly clear, with a low around 47.

Wednesday

Sunny, with a high near 61.

Wednesday Night

Partly cloudy, with a low around 50.