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

Severe Thunderstorms and Critical Fire Weather Wednesday

Scattered severe thunderstorms are possible across portions of the northern High Plains Wednesday afternoon and evening. Severe wind gusts are the primary hazard. Gusty winds and low relative humidity will contribute to critical fire weather conditions across parts of the northern Great Plains and Great Basin Wednesday. Read More >

Hazardous Weather Conditions

Current conditions at

Johnstown - Cambria County Airport (KJST)

Lat: 40.31°NLon: 78.83°WElev: 2274ft.

Fair

55°F

13°C

Humidity 44%
Wind Speed SW 3 mph
Barometer 29.95 in (1013.5 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Last update 13 May 2:54 am EDT
Extended Forecast for

Brownstown PA

  • Overnight

    Overnight: Mostly cloudy, with a low around 51. South wind around 5 mph.

    Low: 51 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Showers likely, then showers and possibly a thunderstorm after 2pm. High near 65. Southwest wind 9 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 65 °F

    Chance
    Showers then
    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm before 10pm, then a slight chance of showers after 4am. Low around 43. West wind 3 to 6 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 43 °F

    Showers then
    Mostly Cloudy

  • Thursday

    Thursday: Showers likely, mainly after 2pm. Mostly cloudy, with a high near 51. Northwest wind 7 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 51 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely, mainly before 8pm. Mostly cloudy, with a low around 43. Northwest wind 3 to 7 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 43 °F

    Showers
    Likely then
    Chance
    Showers

  • Friday

    Friday: Partly sunny, with a high near 67.

    High: 67 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 50.

    Low: 50 °F

    Partly Cloudy

  • Saturday

    Saturday: A chance of showers after 2pm. Mostly sunny, with a high near 79. Chance of precipitation is 40%.

    High: 79 °F

    Mostly Sunny
    then Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers before 8pm. Partly cloudy, with a low around 59. Chance of precipitation is 30%.

    Low: 59 °F

    Chance
    Showers then
    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 51. South wind around 5 mph.
Wednesday
Showers likely, then showers and possibly a thunderstorm after 2pm. High near 65. Southwest wind 9 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers and possibly a thunderstorm before 10pm, then a slight chance of showers after 4am. Low around 43. West wind 3 to 6 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
Showers likely, mainly after 2pm. Mostly cloudy, with a high near 51. Northwest wind 7 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
Showers likely, mainly before 8pm. Mostly cloudy, with a low around 43. Northwest wind 3 to 7 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Partly sunny, with a high near 67.
Friday Night
Partly cloudy, with a low around 50.
Saturday
A chance of showers after 2pm. Mostly sunny, with a high near 79. Chance of precipitation is 40%.
Saturday Night
A chance of showers before 8pm. Partly cloudy, with a low around 59. Chance of precipitation is 30%.
Sunday
Mostly sunny, with a high near 86.
Sunday Night
Partly cloudy, with a low around 62.
Monday
Mostly sunny, with a high near 91.
Monday Night
Partly cloudy, with a low around 67.
Tuesday
A chance of showers and thunderstorms. Mostly sunny and hot, with a high near 92. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
Brownstown PA
 40.32°N 78.93°W (Elev. 1670 ft)
Last Update:
2:36 am EDT May 13, 2026
Forecast Valid:
3am EDT May 13, 2026-6pm EDT May 19, 2026
 
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