Prolonged Atmospheric River in the Northwest; Snow in the North-Central US

A prolonged atmospheric river will bring heavy rainfall which may lead to widespread urban and river flooding, heavy mountain snow, along with gusty winds to the Pacific Northwest into the northern Rockies through much of the week. A clipper will bring a period of snow across the upper Midwest and the Great Lakes into Tuesday, before a stronger system bring more wintry impacts. Read More >

Current conditions at

Philadelphia - Wings Field Airport (KLOM)

Lat: 40.14°NLon: 75.27°WElev: 282ft.

Fair

23°F

-5°C

Humidity 34%
Wind Speed N 6 mph
Barometer 30.30 in
Dewpoint -1°F (-18°C)
Visibility 10.00 mi
Wind Chill16°F (-9°C)
Last update 8 Dec 9:15 pm EST
Extended Forecast for

Bryn Mawr PA

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 14. North wind around 5 mph.

    Low: 14 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Increasing clouds, with a high near 33. Calm wind becoming south around 5 mph in the afternoon.

    High: 33 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 27. Southwest wind 5 to 10 mph.

    Low: 27 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Rain likely, mainly after 1pm.  Mostly cloudy, with a high near 43. South wind around 10 mph, with gusts as high as 25 mph.  Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 43 °F

    Chance Rain
    then Rain
    Likely

  • Wednesday Night

    Wednesday Night: A slight chance of rain before 1am.  Mostly cloudy, with a low around 32. Southwest wind around 10 mph, with gusts as high as 20 mph.  Chance of precipitation is 20%.

    Low: 32 °F

    Slight Chance
    Rain

  • Thursday

    Thursday: Mostly sunny, with a high near 38.

    High: 38 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 25.

    Low: 25 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 36.

    High: 36 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A chance of snow.  Mostly cloudy, with a low around 25. Chance of precipitation is 40%.

    Low: 25 °F

    Chance Snow

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 14. North wind around 5 mph.
Tuesday
Increasing clouds, with a high near 33. Calm wind becoming south around 5 mph in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 27. Southwest wind 5 to 10 mph.
Wednesday
Rain likely, mainly after 1pm. Mostly cloudy, with a high near 43. South wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
A slight chance of rain before 1am. Mostly cloudy, with a low around 32. Southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Thursday
Mostly sunny, with a high near 38.
Thursday Night
Partly cloudy, with a low around 25.
Friday
Mostly sunny, with a high near 36.
Friday Night
A chance of snow. Mostly cloudy, with a low around 25. Chance of precipitation is 40%.
Saturday
Partly sunny, with a high near 35.
Saturday Night
Mostly cloudy, with a low around 20.
Sunday
Mostly sunny, with a high near 31.
Sunday Night
Mostly clear, with a low around 17.
Monday
Mostly sunny, with a high near 31.
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ABOUT THIS FORECAST

 
Point Forecast:
Bryn Mawr PA
 40.02°N 75.32°W (Elev. 397 ft)
4:10 pm EST Dec 8, 2025
9pm EST Dec 8, 2025-6pm EST 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