Forecast Details for Allentown, PA

Recent Locations: Madison, WV Cedar Rapids, IA Allentown, PA

Overnight: Mostly cloudy, with a low around 9. Calm wind.

Friday: Mostly cloudy, with a high near 29. Calm wind.

Friday Night: Light snow likely, mainly between 7pm and 4am. Cloudy, with a low around 16. Calm wind becoming west around 5 mph after midnight. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.

Saturday: A chance of snow showers, mainly before 10am. Mostly cloudy, with a high near 18. Wind chill values as low as -9. Blustery, with a northwest wind 20 to 25 mph, with gusts as high as 50 mph. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.

Saturday Night: Partly cloudy, with a low around 4. Blustery, with a northwest wind 15 to 25 mph, with gusts as high as 45 mph.

Sunday: Mostly sunny, with a high near 21.

Sunday Night: Partly cloudy, with a low around 7.

Monday: Partly sunny, with a high near 27.

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

Tuesday: Cloudy, with a high near 33.

Tuesday Night: Mostly cloudy, with a low around 21.

Wednesday: A chance of rain. Cloudy, with a high near 38. Chance of precipitation is 30%.

Wednesday Night: Cloudy, with a low around 27.

Thursday: Cloudy, with a high near 40.

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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)

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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