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

Hazardous Weather Conditions

Current conditions at

Altoona - Blair County Airport (KAOO)

Lat: 40.3°NLon: 78.32°WElev: 1467ft.

Fog/Mist

32°F

0°C

Humidity 96%
Wind Speed Calm
Barometer 30.18 in (1023.8 mb)
Dewpoint 31°F (-1°C)
Visibility 1.75 mi
Last update 20 Nov 9:53 am EST
Extended Forecast for

4 Miles NNE Williamsburg PA

Dense Fog Advisory November 20, 10:02am until November 20, 11:00am
Click here for hazard details and duration
...
  •  
    Dense Fog Advisory November 20, 10:02am until November 20, 11:00am

    NOW until 11:00am Thu

    Dense Fog Advisory

  • Today

    High: 46 °F

    Patchy Fog
    then Cloudy

  • Tonight

    Tonight: Patchy fog between 2am and 3am. Otherwise, cloudy, with a low around 37. Calm wind.

    Low: 37 °F

    Patchy Fog

  • Friday

    Friday: A chance of rain, mainly after 1pm. Patchy fog before 10am. Otherwise, cloudy, with a high near 56. Calm wind. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    High: 56 °F

    Chance Rain
    and Patchy
    Fog

  • Friday Night

    Friday Night: Rain likely, mainly before 1am. Cloudy, with a low around 40. Light and variable wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 40 °F

    Rain Likely

  • Saturday

    Saturday: A slight chance of rain before 1pm. Partly sunny, with a high near 50. Northwest wind 3 to 6 mph. Chance of precipitation is 20%.

    High: 50 °F

    Slight Chance
    Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 28.

    Low: 28 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 53.

    High: 53 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 35.

    Low: 35 °F

    Partly Cloudy

Detailed Forecast

Today
Patchy fog before 11am. Otherwise, cloudy, with a high near 46. Calm wind.
Tonight
Patchy fog between 2am and 3am. Otherwise, cloudy, with a low around 37. Calm wind.
Friday
A chance of rain, mainly after 1pm. Patchy fog before 10am. Otherwise, cloudy, with a high near 56. Calm wind. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
Rain likely, mainly before 1am. Cloudy, with a low around 40. Light and variable wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
A slight chance of rain before 1pm. Partly sunny, with a high near 50. Northwest wind 3 to 6 mph. Chance of precipitation is 20%.
Saturday Night
Partly cloudy, with a low around 28.
Sunday
Sunny, with a high near 53.
Sunday Night
Partly cloudy, with a low around 35.
Monday
Mostly sunny, with a high near 54.
Monday Night
Mostly cloudy, with a low around 36.
Tuesday
A chance of rain. Mostly cloudy, with a high near 53. Chance of precipitation is 50%.
Tuesday Night
Rain likely. Mostly cloudy, with a low around 43. Chance of precipitation is 60%.
Wednesday
A chance of rain. Mostly cloudy, with a high near 59. Chance of precipitation is 30%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNE Williamsburg PA
 40.51°N 78.17°W (Elev. 804 ft)
Last Update:
8:56 am EST Nov 20, 2025
Forecast Valid:
10am EST Nov 20, 2025-6pm EST Nov 26, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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