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.

52°F

11°C

Humidity	100%
Wind Speed	W 2 MPH
Barometer	NA
Dewpoint	52°F (11°C)
Visibility	NA
Last update	11 Apr 04:10 AM PDT

More Information:

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

Extended Forecast for

2 Miles NNW Portola Valley CA

Overnight
Low: 50 °F
Slight Chance
Rain
Saturday
High: 64 °F
Chance Rain
then Showers
Saturday Night
Low: 47 °F
Showers
Sunday
High: 61 °F
Showers
Sunday Night
Low: 46 °F
Slight Chance
Rain
Monday
High: 66 °F
Mostly Sunny
Monday Night
Low: 46 °F
Mostly Clear
Tuesday
High: 66 °F
Sunny
Tuesday Night
Low: 46 °F
Mostly Clear

Detailed Forecast

Overnight

A 20 percent chance of rain before 5am. Mostly cloudy, with a low around 50. South southwest wind around 6 mph. New precipitation amounts of less than a tenth of an inch possible.

Saturday

Rain and thunderstorms likely, then showers and possibly a thunderstorm after 4pm. High near 64. South wind 6 to 11 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Saturday Night

Showers and thunderstorms, mainly before 1am, then showers likely and possibly a thunderstorm after 2am. Low around 47. South southwest wind 9 to 15 mph, with gusts as high as 29 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

Sunday

Showers and possibly a thunderstorm. High near 61. South southwest wind around 11 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

Sunday Night

A 20 percent chance of rain. Partly cloudy, with a low around 46. West southwest wind 5 to 8 mph becoming calm in the evening. New precipitation amounts of less than a tenth of an inch possible.

Monday

Mostly sunny, with a high near 66.

Monday Night

Mostly clear, with a low around 46.

Tuesday

Sunny, with a high near 66.

Tuesday Night

Mostly clear, with a low around 46.

Wednesday

Mostly sunny, with a high near 66.

Wednesday Night

Partly cloudy, with a low around 48.