Forecast Details for Harrisburg, IL

Recent Locations: Afton, NY Carroll, IA Harrisburg, IL

This Afternoon: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80. West southwest wind 9 to 11 mph, with gusts as high as 18 mph.

Tonight: A chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 8pm. Mostly cloudy, with a low around 66. Southeast wind 6 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.

Thursday: A chance of showers between 3pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 81. Breezy, with a south southwest wind 14 to 21 mph, with gusts as high as 31 mph. Chance of precipitation is 30%.

Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 7pm. Mostly cloudy, with a low around 65. South southwest wind 10 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.

Friday: Showers likely before 10am, then showers likely and possibly a thunderstorm between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82. South southwest wind 9 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.

Friday Night: A slight chance of showers, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 62. South wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.

Saturday: Showers and possibly a thunderstorm. High near 71. South southwest wind 10 to 13 mph becoming west in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 90%.

Saturday Night: A chance of showers before 1am. Mostly cloudy, with a low around 41. Northwest wind 6 to 8 mph.

Sunday: Sunny, with a high near 60. Northwest wind 6 to 10 mph.

Sunday Night: Clear, with a low around 37. North northwest wind around 6 mph becoming calm in the evening.

Monday: Sunny, with a high near 66. Calm wind becoming northwest around 6 mph in the afternoon.

Monday Night: Partly cloudy, with a low around 41. Light north wind.

Tuesday: Mostly sunny, with a high near 60. North northeast wind 5 to 8 mph.

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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

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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