Forecast Details for Allentown, PA

Recent Locations: McKinney, TX Pasadena, TX Allentown, PA

Tonight: 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)

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 Nimbostratus Clouds?

Home - Education - Cloud Types - Nimbostratus Clouds

Nimbostratus Clouds Next Topic: Precipitation

A nimbostratus cloud is similar to a stratus cloud in its formless, smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud, because it is thicker.

Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat of moderate to heavy precipitation. In some cases, the precipitation may evaporate before reaching the ground, a phenomenon known as virga.

Next Topic: Precipitation

Weather Topic: What is Rain?

Home - Education - Precipitation - Rain

Rain Next Topic: Shelf Clouds

Precipitation in the form of water droplets is called rain. Rain generally has a tendency to fall with less intensity over a greater period of time, and when rainfall is more severe it is usually less sustained.

Rain is the most common form of precipitation and happens with greater frequency depending on the season and regional influences. Cities have been shown to have an observable effect on rainfall, due to an effect called the urban heat island. Compared to upwind, monthly rainfall between twenty and forty miles downwind of cities is 30% greater.

Next Topic: Shelf Clouds