Forecast Details for Illiopolis, IL

Recent Locations: Blanchard, PA Manhattan, MT Illiopolis, IL

This Afternoon: A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 53. East northeast wind around 14 mph, with gusts as high as 21 mph.

Tonight: Showers and thunderstorms before 3am, then showers likely and possibly a thunderstorm between 3am and 4am, then a chance of showers and thunderstorms after 4am. Temperature falling to near 51 by 9pm, then rising to around 59 during the remainder of the night. East northeast wind around 15 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday: Showers and thunderstorms likely, mainly before 3pm. Cloudy, with a high near 74. Breezy, with a south wind 17 to 22 mph increasing to 23 to 28 mph in the afternoon. Winds could gust as high as 43 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday Night: Showers and thunderstorms likely. Mostly cloudy, with a low around 59. Breezy, with a southwest wind 20 to 25 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 37 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday: A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 78. South wind 7 to 17 mph, with gusts as high as 24 mph.

Friday Night: Showers and possibly a thunderstorm. Low around 54. South wind 14 to 16 mph, with gusts as high as 22 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

Saturday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 62. West wind 13 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

Saturday Night: Partly cloudy, with a low around 36.

Sunday: Mostly sunny, with a high near 53. Breezy.

Sunday Night: Clear, with a low around 33.

Monday: Sunny, with a high near 61.

Monday Night: Partly cloudy, with a low around 37.

Tuesday: Mostly sunny, with a high near 56.

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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 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

Weather Topic: What are Cirrostratus Clouds?

Home - Education - Cloud Types - Cirrostratus Clouds

Next Topic: Cirrus Clouds

Cirrostratus clouds are high, thin clouds that form above 20,000 feet and are made mostly of ice crystals. They sometimes look like giant feathers, horse tails, or curls of hair in the sky. These clouds are pushed by the jet stream and can move at high speeds reaching 100 mph.

What do they indicate?
They indicate that a precipitation is likely within 24 hours.

Next Topic: Cirrus Clouds