Prolonged Atmospheric River in the Pacific Northwest; Snow and High Winds in the North-Central U.S.

A prolonged atmospheric river will continue impacting the Pacific Northwest with heavy rainfall which has lead to areas of urban and river flooding along with gusty winds into Thursday. A clipper will bring heavy snow, some mixed wintry precipitation, and gusty to high winds across the northern Plains, Upper Midwest, and the Great Lakes into Thursday morning. Read More >

Current conditions at

LAS TRAMPAS (LTRC1)

Lat: 37.83389°NLon: 122.06694°WElev: 1760.0ft.

NA

54°F

12°C

Humidity 62%
Wind Speed E 13 MPH
Barometer NA
Dewpoint 41°F (5°C)
Visibility NA
Last update 09 Dec 01:28 PM PST
Extended Forecast for

Walnut Creek CA

  • This Afternoon

    This Afternoon: Sunny, with a steady temperature around 49. North northeast wind 3 to 5 mph.

    High: 49 °F

    Sunny

  • Tonight

    Tonight: Patchy dense fog before midnight, then patchy dense fog after 2am.  Otherwise, partly cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Patchy Dense
    Fog

  • Wednesday

    Wednesday: Patchy dense fog before 9am.  Otherwise, mostly sunny, with a high near 62. North northeast wind 3 to 5 mph.

    High: 62 °F

    Patchy Dense
    Fog then
    Sunny

  • Wednesday Night

    Wednesday Night: Patchy fog after 4am.  Otherwise, mostly clear, with a low around 44. Calm wind.

    Low: 44 °F

    Mostly Clear
    then Patchy
    Fog

  • Thursday

    Thursday: Patchy fog before 8am.  Otherwise, sunny, with a high near 65. Calm wind becoming northeast around 5 mph in the morning.

    High: 65 °F

    Patchy Fog
    then Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 62.

    High: 62 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Patchy fog after 3am.  Otherwise, mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear
    then Patchy
    Fog

  • Saturday

    Saturday: Patchy fog before 7am.  Otherwise, mostly sunny, with a high near 60.

    High: 60 °F

    Patchy Fog
    then Mostly
    Sunny

Detailed Forecast

This Afternoon
Sunny, with a steady temperature around 49. North northeast wind 3 to 5 mph.
Tonight
Patchy dense fog before midnight, then patchy dense fog after 2am. Otherwise, partly cloudy, with a low around 42. Calm wind.
Wednesday
Patchy dense fog before 9am. Otherwise, mostly sunny, with a high near 62. North northeast wind 3 to 5 mph.
Wednesday Night
Patchy fog after 4am. Otherwise, mostly clear, with a low around 44. Calm wind.
Thursday
Patchy fog before 8am. Otherwise, sunny, with a high near 65. Calm wind becoming northeast around 5 mph in the morning.
Thursday Night
Mostly clear, with a low around 42.
Friday
Mostly sunny, with a high near 62.
Friday Night
Patchy fog after 3am. Otherwise, mostly clear, with a low around 41.
Saturday
Patchy fog before 7am. Otherwise, mostly sunny, with a high near 60.
Saturday Night
Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 43.
Sunday
Areas of fog. Otherwise, partly sunny, with a high near 61.
Sunday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 45.
Monday
A slight chance of rain. Areas of fog. Otherwise, partly sunny, with a high near 62.
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ABOUT THIS FORECAST

 
Point Forecast:
Walnut Creek CA
 37.9°N 122.07°W (Elev. 203 ft)
12:26 pm PST Dec 9, 2025
2pm PST Dec 9, 2025-6pm PST Dec 15, 2025
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database