Powerful Winter Storm from the Upper Midwest into the Northeast; Severe Thunderstorms in the Midwest and Ohio Valley

A rapidly-intensifying storm is expected to bring heavy snow, blizzard conditions, and icing from the Upper Midwest through the Great Lakes and Northeast. Scattered severe thunderstorms may produce severe/damaging wind gusts and a couple of tornadoes across parts of the Midwest and lower Ohio Valley through the evening. Arctic air will expand across the central and southern U.S.. Read More >

Current conditions at

LAS TRAMPAS (LTRC1)

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

NA

45°F

7°C

Humidity 65%
Wind Speed E 22 MPH
Barometer NA
Dewpoint 34°F (1°C)
Visibility NA
Wind Chill37°F (3°C)
Last update 28 Dec 11:28 PM PST
Extended Forecast for

3 Miles WSW San Ramon CA

Cold Weather Advisory December 29, 01:00am until December 29, 09:00am
Click here for hazard details and duration
Cold Weather Advisory
  • Overnight

    Overnight: Areas of frost after 4am.  Otherwise, partly cloudy, with a steady temperature around 39. Northeast wind around 7 mph.

    Low: 39 °F

    Areas Frost

  • Monday

    Monday: Patchy frost before 9am.  Otherwise, sunny, with a high near 51. Northeast wind around 7 mph.

    High: 51 °F

    Patchy Frost
    then Sunny

  • Monday Night

    Monday Night: Patchy frost after 3am.  Otherwise, mostly clear, with a low around 35. East northeast wind around 6 mph.

    Low: 35 °F

    Mostly Clear
    then Patchy
    Frost

  • Tuesday

    Tuesday: Areas of frost before 9am.  Otherwise, sunny, with a high near 52. East northeast wind around 7 mph.

    High: 52 °F

    Areas Frost
    then Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 37. East northeast wind around 6 mph.

    Low: 37 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 10 percent chance of rain after 4pm.  Partly sunny, with a high near 51.

    High: 51 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain, mainly after 10pm.  Mostly cloudy, with a low around 42.

    Low: 42 °F

    Chance Rain

  • New Year's Day

    New Year's Day: Rain likely, mainly between 10am and 4pm.  Mostly cloudy, with a high near 50.

    High: 50 °F

    Rain Likely

  • Thursday Night

    Thursday Night: Rain likely, mainly after 10pm.  Cloudy, with a low around 46.

    Low: 46 °F

    Rain Likely

Detailed Forecast

Overnight
Areas of frost after 4am. Otherwise, partly cloudy, with a steady temperature around 39. Northeast wind around 7 mph.
Monday
Patchy frost before 9am. Otherwise, sunny, with a high near 51. Northeast wind around 7 mph.
Monday Night
Patchy frost after 3am. Otherwise, mostly clear, with a low around 35. East northeast wind around 6 mph.
Tuesday
Areas of frost before 9am. Otherwise, sunny, with a high near 52. East northeast wind around 7 mph.
Tuesday Night
Mostly cloudy, with a low around 37. East northeast wind around 6 mph.
Wednesday
A 10 percent chance of rain after 4pm. Partly sunny, with a high near 51.
Wednesday Night
A 40 percent chance of rain, mainly after 10pm. Mostly cloudy, with a low around 42.
New Year's Day
Rain likely, mainly between 10am and 4pm. Mostly cloudy, with a high near 50.
Thursday Night
Rain likely, mainly after 10pm. Cloudy, with a low around 46.
Friday
Rain likely, mainly before 10am. Mostly cloudy, with a high near 53.
Friday Night
A chance of rain. Mostly cloudy, with a low around 46.
Saturday
A chance of rain. Mostly cloudy, with a high near 53.
Saturday Night
A chance of rain. Mostly cloudy, with a low around 46.
Sunday
A chance of rain. Partly sunny, with a high near 53.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW San Ramon CA
 37.75°N 122°W (Elev. 1362 ft)
12:27 pm PST Dec 28, 2025
12am PST Dec 29, 2025-6pm PST Jan 4, 2026
 
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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