National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Winter Storm Bringing Widespread Hazardous Weather to the Eastern U.S.

A rapidly-intensifying winter storm continues to bring heavy snow, high winds, and blizzard conditions over the Upper Midwest and Great Lakes through today. An Arctic front will lead in a period of gusty to high winds and sharply colder temperatures over the entire eastern U.S. Heavy lake effect snow is then expected from Lakes Erie and Ontario through New Year's Day. Read More >

Hazardous Weather Conditions

Current conditions at

DIABLO GRANDE (DBLC1)

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

NA

43°F

6°C

Humidity 61%
Wind Speed NNE 4 MPH
Barometer NA
Dewpoint 30°F (-1°C)
Visibility NA
Wind Chill41°F (5°C)
Last update 29 Dec 05:00 AM PST
Extended Forecast for

9 Miles SW Tracy CA

Dense Fog Advisory until December 29, 11:00am
Frost Advisory until December 29, 09:00am
Click here for hazard details and duration
Dense Fog Advisory
Frost Advisory
  •  
    Dense Fog Advisory until December 29, 11:00am
    Frost Advisory until December 29, 09:00am

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Overnight

    Low: 33 °F

    Frost

  • Monday

    Monday: Areas of frost before 9am. Otherwise, sunny, with a high near 52. Calm wind becoming north around 5 mph.

    High: 52 °F

    Areas Frost
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 38. Calm wind.

    Low: 38 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, then becoming mostly cloudy during the afternoon, with a high near 49. East northeast wind 3 to 6 mph.

    High: 49 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 10 percent chance of rain after 4am. Cloudy, with a low around 44. Calm wind.

    Low: 44 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday

    Wednesday: Rain likely, mainly after 4pm. Cloudy, with a high near 49. Chance of precipitation is 60%.

    High: 49 °F

    Rain Likely

  • Wednesday Night

    Wednesday Night: Rain. Low around 45. Chance of precipitation is 80%.

    Low: 45 °F

    Rain

  • New Year's Day

    New Year's Day: Rain. Mostly cloudy, with a high near 52.

    High: 52 °F

    Rain

Detailed Forecast

Overnight
Widespread frost. Otherwise, mostly clear, with a low around 33. Calm wind.
Monday
Areas of frost before 9am. Otherwise, sunny, with a high near 52. Calm wind becoming north around 5 mph.
Monday Night
Mostly clear, with a low around 38. Calm wind.
Tuesday
Sunny, then becoming mostly cloudy during the afternoon, with a high near 49. East northeast wind 3 to 6 mph.
Tuesday Night
A 10 percent chance of rain after 4am. Cloudy, with a low around 44. Calm wind.
Wednesday
Rain likely, mainly after 4pm. Cloudy, with a high near 49. Chance of precipitation is 60%.
Wednesday Night
Rain. Low around 45. Chance of precipitation is 80%.
New Year's Day
Rain. Mostly cloudy, with a high near 52.
Thursday Night
Rain likely. Mostly cloudy, with a low around 48.
Friday
Rain likely. Mostly cloudy, with a high near 54.
Friday Night
Rain likely. Mostly cloudy, with a low around 47.
Saturday
Rain likely. Mostly cloudy, with a high near 51.
Saturday Night
Rain likely. Mostly cloudy, with a low around 45.
Sunday
A chance of rain. Partly sunny, with a high near 51.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
9 Miles SW Tracy CA
 37.62°N 121.54°W (Elev. 1604 ft)
Last Update:
1:21 am PST Dec 29, 2025
Forecast Valid:
5am PST Dec 29, 2025-6pm PST Jan 4, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation