Forecast Details for Allentown, PA

Recent Locations: Peoria, AZ Irving, TX Allentown, PA

Overnight: Mostly cloudy, with a low around 12. Calm wind.

Friday: A slight chance of snow after 4pm. Mostly cloudy, with a high near 30. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 20%.

Friday Night: A chance of snow, mainly between 7pm and 4am. Cloudy, with a low around 10. Southwest wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 40%. New snow accumulation of less than one inch possible.

Saturday: Partly sunny, with a high near 14. Wind chill values as low as -12. Blustery, with a northwest wind 20 to 25 mph, with gusts as high as 50 mph.

Saturday Night: Partly cloudy, with a low around 2. Blustery, with a northwest wind 15 to 20 mph, with gusts as high as 45 mph.

Sunday: Sunny, with a high near 19.

Sunday Night: Partly cloudy, with a low around 3.

Monday: Partly sunny, with a high near 26.

Monday Night: Partly cloudy, with a low around 11.

Tuesday: Mostly sunny, with a high near 34.

Tuesday Night: Mostly cloudy, with a low around 19.

Wednesday: A chance of rain, snow, and freezing rain. Mostly cloudy, with a high near 37. Chance of precipitation is 50%.

Wednesday Night: A chance of rain and snow. Mostly cloudy, with a low around 20. Chance of precipitation is 30%.

Thursday: Mostly cloudy, with a high near 33.

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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 Wall Clouds?

Home - Education - Cloud Types - Wall Clouds

Wall Clouds Next Topic: Altocumulus Clouds

A wall cloud forms underneath the base of a cumulonimbus cloud, and can be a hotbed for deadly tornadoes.

Wall clouds are formed by air flowing into the cumulonimbus clouds, which can result in the wall cloud descending from the base of the cumulonimbus cloud, or rising fractus clouds which join to the base of the storm cloud as the wall cloud takes shape.

Wall clouds can be very large, and in the Northern Hemisphere they generally form at the southern edge of cumulonimbus clouds.

Next Topic: Altocumulus Clouds

Weather Topic: What are Altostratus Clouds?

Home - Education - Cloud Types - Altostratus Clouds

Next Topic: Cirrocumulus Clouds

Altostratus clouds form at mid to high-level altitudes (between 2 and 7 km) and are created by a warm, stable air mass which causes water vapor to condense as it rise through the atmosphere. Usually altostratus clouds are featureless sheets characterized by a uniform color.

In some cases, wind punching through the cloud formation may give it a waved appearance, called altostratus undulatus. Altostratus clouds are commonly seen with other cloud formations accompanying them.

Next Topic: Cirrocumulus Clouds