Forecast Details for Port Allegany, PA

Recent Locations: Crawfordville, GA Westbrook, ME Port Allegany, PA

Current Alerts for Port Allegany, PA: Winter Weather Advisory

Today: A chance of snow before 1pm, then a chance of snow after 2pm. Partly sunny, with a high near 40. Southwest wind 9 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 50%. Total daytime snow accumulation of less than a half inch possible.

Tonight: Mostly cloudy, with a low around 15. West wind 5 to 8 mph, with gusts as high as 21 mph.

Thursday: Mostly sunny, with a high near 34. Calm wind becoming west around 5 mph.

Thursday Night: Mostly clear, with a low around 15. Calm wind.

Friday: Sunny, with a high near 46. Calm wind becoming southwest 5 to 7 mph in the morning.

Friday Night: Mostly clear, with a low around 29.

Saturday: Mostly sunny, with a high near 47.

Saturday Night: A chance of snow showers after 1am. Mostly cloudy, with a low around 21. Chance of precipitation is 40%.

Sunday: Mostly sunny, with a high near 32.

Sunday Night: A chance of snow showers after 1am. Mostly cloudy, with a low around 13. Chance of precipitation is 30%.

Monday: A chance of snow showers. Partly sunny, with a high near 29. Chance of precipitation is 40%.

Monday Night: Partly cloudy, with a low around 9.

Tuesday: A chance of snow showers. Partly sunny, with a high near 35. Chance of precipitation is 30%.

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Current U.S. National Radar--Current

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National Weather Forecast--Current

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National Weather Forecast for Tomorrow

Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.

North America Water Vapor (Moisture)

This map shows recent moisture content over North America. Bright and colored areas show high moisture (ie, clouds); brown indicates very little moisture present; black indicates no moisture.

Weather Topic: What are Mammatus Clouds?

Home - Education - Cloud Types - Mammatus Clouds

Mammatus Clouds Next Topic: Nimbostratus Clouds

A mammatus cloud is a cloud with a unique feature which resembles a web of pouches hanging along the base of the cloud.

In the United States, mammatus clouds tend to form in the warmer months, commonly in the Midwest and eastern regions.

While they usually form at the bottom of a cumulonimbis cloud, they can also form under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds warn that severe weather is close.

Next Topic: Nimbostratus Clouds

Weather Topic: What is Precipitation?

Home - Education - Precipitation - Precipitation

Next Topic: Rain

Precipitation can refer to many different forms of water that may fall from clouds. Precipitation occurs after a cloud has become saturated to the point where its water particles are more dense than the air below the cloud.

In most cases, precipitation will reach the ground, but it is not uncommon for precipitation to evaporate before it reaches the earth's surface. When precipitation evaporates before it contacts the ground it is called Virga. Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog and mist are not considered precipitation because the water vapor which constitutes them isn't dense enough to fall to the ground.

Next Topic: Rain