Forecast Details for Allentown, PA

Recent Locations: Harrison City, PA Bakersfield, CA Allentown, PA

Tonight: A chance of showers and thunderstorms, mainly before midnight. Mostly cloudy, with a low around 59. South wind 10 to 15 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Wednesday: Mostly sunny, with a high near 72. Northwest wind 10 to 15 mph.

Wednesday Night: Partly cloudy, with a low around 45. North wind around 5 mph becoming calm.

Thursday: Partly sunny, with a high near 75. Calm wind becoming south around 5 mph in the afternoon.

Thursday Night: A chance of showers. Mostly cloudy, with a low around 58. Southeast wind around 5 mph. Chance of precipitation is 40%. New precipitation amounts between a tenth and quarter of an inch possible.

Friday: A slight chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 83. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Friday Night: Showers likely, mainly before 8pm. Mostly cloudy, with a low around 57. Chance of precipitation is 60%.

Saturday: Showers likely, mainly after 2pm. Partly sunny, with a high near 70. Chance of precipitation is 60%.

Saturday Night: Showers likely before 8pm. Partly cloudy, with a low around 46. Chance of precipitation is 60%.

Sunday: Mostly sunny, with a high near 66.

Sunday Night: Mostly clear, with a low around 46.

Monday: Sunny, with a high near 70.

Monday Night: Partly cloudy, with a low around 49.

Tuesday: Mostly sunny, with a high near 73.

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Current U.S. National Radar--Current

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National Weather Forecast for Tomorrow

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North America Water Vapor (Moisture)

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Weather Topic: What is Sleet?

Home - Education - Precipitation - Sleet

Sleet Next Topic: Snow

Sleet is a form of precipitation in which small ice pellets are the primary components. These ice pellets are smaller and more translucent than hailstones, and harder than graupel. Sleet is caused by specific atmospheric conditions and therefore typically doesn't last for extended periods of time.

The condition which leads to sleet formation requires a warmer body of air to be wedged in between two sub-freezing bodies of air. When snow falls through a warmer layer of air it melts, and as it falls through the next sub-freezing body of air it freezes again, forming ice pellets known as sleet. In some cases, water droplets don't have time to freeze before reaching the surface and the result is freezing rain.

Next Topic: Snow

Weather Topic: What are Stratocumulus Clouds?

Home - Education - Cloud Types - Stratocumulus Clouds

Next Topic: Stratus Clouds

Stratocumulus clouds are similar to altocumulus clouds in their fluffy appearance, but have a slightly darker shade due to their additional mass.

A good way to distinguish the two cloud types is to hold your hand out and measure the size of an individual cloud; if it is the size of your thumb it is generally an altocumulus cloud, if it is the size of your hand it is generally a stratocumulus cloud.

It is uncommon for stratocumulus clouds to produce precipitation, but if they do it is usually a light rain or snow.

Next Topic: Stratus Clouds