Tracking a Winter Storm; Unusual Early-Season Heat Wave in the Southwest

A major winter storm will organize across the Northern Plains today and then rapidly strengthen as it moves into the Great Lakes on Sunday. Heavy snow and blowing snow are likely to persist over the Great Lakes into Monday night. Dry and gusty winds will produce a critical fire risk across the central/southern Plains. An early heatwave will begin to intensify over the western U.S. into next week. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

Lat: 38.2075°NLon: 122.27944°WElev: 33.0ft.

Clear

70°F

21°C

Humidity 55%
Wind Speed SSW 6 MPH
Barometer 30.05 in (1017.61 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 14 Mar 02:54 PM PDT
Extended Forecast for

4 Miles E Saint Helena CA

Heat Advisory March 16, 10:00am until March 20, 08:00pm
Click here for hazard details and duration
Heat Advisory
  • Tonight

    Tonight: Mostly clear, with a low around 53. Calm wind.

    Low: 53 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 87. North wind 3 to 6 mph.

    High: 87 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 56. Light north northwest wind.

    Low: 56 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 90. Calm wind.

    High: 90 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 59. Calm wind.

    Low: 59 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 92.

    High: 92 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 91.

    High: 91 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 53. Calm wind.
Sunday
Sunny, with a high near 87. North wind 3 to 6 mph.
Sunday Night
Partly cloudy, with a low around 56. Light north northwest wind.
Monday
Sunny, with a high near 90. Calm wind.
Monday Night
Clear, with a low around 59. Calm wind.
Tuesday
Sunny, with a high near 92.
Tuesday Night
Mostly clear, with a low around 59.
Wednesday
Sunny, with a high near 91.
Wednesday Night
Mostly clear, with a low around 59.
Thursday
Mostly sunny, with a high near 94.
Thursday Night
Mostly clear, with a low around 61.
Friday
Sunny, with a high near 95.
Friday Night
Partly cloudy, with a low around 62.
Saturday
Sunny, with a high near 88.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Saint Helena CA
 38.5°N 122.4°W (Elev. 476 ft)
1:26 pm PDT Mar 14, 2026
3pm PDT Mar 14, 2026-6pm PDT Mar 21, 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