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

Hazardous Weather Conditions

Current conditions at

St Marys Municipal Airport (KOYM)

Lat: 41.41°NLon: 78.5°WElev: 1934ft.

Overcast

34°F

1°C

Humidity 93%
Wind Speed S 8 mph
Barometer 29.55 in
Dewpoint 32°F (0°C)
Visibility 2.00 mi
Wind Chill27°F (-3°C)
Last update 10 Dec 4:55 am EST
Extended Forecast for

4 Miles WNW Emporium PA

Winter Weather Advisory December 10, 05:07am until December 12, 04:00am
Click here for hazard details and duration
Winter Weather Advisory
  •  
    Winter Weather Advisory December 10, 05:07am until December 12, 04:00am

    NOW until 4:00am Fri

    Winter Weather Advisory

  • Overnight

    Low: 25 °F

    Snow

  • Wednesday

    Wednesday: Rain and snow before 1pm, then rain between 1pm and 4pm, then a chance of rain and snow after 4pm. High near 39. Southwest wind 8 to 10 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New snow accumulation of less than one inch possible.

    High: 39 °F

    Rain/Snow

  • Wednesday Night

    Wednesday Night: Rain and snow showers before 9pm, then a chance of snow showers. Low around 19. West wind 7 to 9 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    Low: 19 °F

    Rain/Snow
    then Chance
    Snow Showers

  • Thursday

    Thursday: Snow showers. The snow could be heavy at times. High near 28. West wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New snow accumulation of 2 to 4 inches possible.

    High: 28 °F

    Heavy Snow

  • Thursday Night

    Thursday Night: A chance of snow showers. Mostly cloudy, with a low around 19. West wind 6 to 11 mph, with gusts as high as 26 mph. Chance of precipitation is 50%. New snow accumulation of 1 to 2 inches possible.

    Low: 19 °F

    Chance Snow
    Showers

  • Friday

    Friday: A chance of snow showers. Mostly cloudy, with a high near 31. Chance of precipitation is 30%.

    High: 31 °F

    Chance Snow
    Showers

  • Friday Night

    Friday Night: Snow showers likely, mainly after 1am. Mostly cloudy, with a low around 15. Chance of precipitation is 60%.

    Low: 15 °F

    Snow Showers
    Likely

  • Saturday

    Saturday: A chance of snow showers. Mostly cloudy, with a high near 30. Chance of precipitation is 50%.

    High: 30 °F

    Chance Snow
    Showers

Detailed Forecast

Overnight
Snow. Low around 25. South wind around 7 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. Total nighttime snow accumulation of around an inch possible.
Wednesday
Rain and snow before 1pm, then rain between 1pm and 4pm, then a chance of rain and snow after 4pm. High near 39. Southwest wind 8 to 10 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New snow accumulation of less than one inch possible.
Wednesday Night
Rain and snow showers before 9pm, then a chance of snow showers. Low around 19. West wind 7 to 9 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Thursday
Snow showers. The snow could be heavy at times. High near 28. West wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New snow accumulation of 2 to 4 inches possible.
Thursday Night
A chance of snow showers. Mostly cloudy, with a low around 19. West wind 6 to 11 mph, with gusts as high as 26 mph. Chance of precipitation is 50%. New snow accumulation of 1 to 2 inches possible.
Friday
A chance of snow showers. Mostly cloudy, with a high near 31. Chance of precipitation is 30%.
Friday Night
Snow showers likely, mainly after 1am. Mostly cloudy, with a low around 15. Chance of precipitation is 60%.
Saturday
A chance of snow showers. Mostly cloudy, with a high near 30. Chance of precipitation is 50%.
Saturday Night
Snow showers likely. Mostly cloudy, with a low around 14. Chance of precipitation is 70%.
Sunday
A chance of snow showers. Mostly cloudy, with a high near 23. Chance of precipitation is 50%.
Sunday Night
A chance of snow showers. Mostly cloudy, with a low around 10. Chance of precipitation is 30%.
Monday
Mostly cloudy, with a high near 25.
Monday Night
A chance of snow showers. Mostly cloudy, with a low around 11. Chance of precipitation is 40%.
Tuesday
Partly sunny, with a high near 31.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WNW Emporium PA
 41.54°N 78.29°W (Elev. 1175 ft)
Last Update:
3:51 am EST Dec 10, 2025
Forecast Valid:
5am EST Dec 10, 2025-6pm EST Dec 16, 2025
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation