Prolonged Atmospheric River in the Pacific Northwest; Snow and High Winds from the Upper Midwest into the Northeast

A prolonged atmospheric river will continue to impact the Pacific Northwest into the Northern Rockies with heavy rainfall, areas of urban and river flooding, landslides, heavy mountain snow, and gusty winds into Thursday. A strong clipper system will bring the threat of heavy snow and high winds across the Upper Midwest/Great Lakes as well as portions of the interior Northeast and Appalachians. Read More >

Current conditions at

DIABLO GRANDE (DBLC1)

Lat: 37.32927°NLon: 121.29538°WElev: 1861.0ft.

NA

35°F

2°C

Humidity 100%
Wind Speed SW 2 MPH
Barometer NA
Dewpoint 35°F (2°C)
Visibility NA
Last update 10 Dec 12:00 AM PST
Extended Forecast for

14 Miles NE Mount Hamilton CA

  • Overnight

    Overnight: Widespread haze after 2am. Clear, with a low around 41. North northwest wind around 5 mph.

    Low: 41 °F

    Haze

  • Wednesday

    Wednesday: Widespread haze before 11am. Sunny, with a high near 64. North wind around 6 mph.

    High: 64 °F

    Haze then
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 41. Light northwest wind.

    Low: 41 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 64. North wind 3 to 6 mph.

    High: 64 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 40. Calm wind.

    Low: 40 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

Detailed Forecast

Overnight
Widespread haze after 2am. Clear, with a low around 41. North northwest wind around 5 mph.
Wednesday
Widespread haze before 11am. Sunny, with a high near 64. North wind around 6 mph.
Wednesday Night
Mostly clear, with a low around 41. Light northwest wind.
Thursday
Sunny, with a high near 64. North wind 3 to 6 mph.
Thursday Night
Mostly clear, with a low around 40. Calm wind.
Friday
Sunny, with a high near 62.
Friday Night
Mostly clear, with a low around 39.
Saturday
Sunny, with a high near 62.
Saturday Night
Mostly clear, with a low around 37.
Sunday
Areas of frost before 7am. Otherwise, sunny, with a high near 59.
Sunday Night
Partly cloudy, with a low around 38.
Monday
Mostly sunny, with a high near 58.
Monday Night
A slight chance of showers. Mostly cloudy, with a low around 43.
Tuesday
A slight chance of showers. Mostly sunny, with a high near 58.
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ABOUT THIS FORECAST

 
Point Forecast:
14 Miles NE Mount Hamilton CA
 37.49°N 121.48°W (Elev. 2799 ft)
1:21 pm PST Dec 9, 2025
12am PST Dec 10, 2025-6pm PST Dec 16, 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