Forecast Details for Decatur, IL

Recent Locations: Redgranite, WI Columbia, MO Decatur, IL

Current Alerts for Decatur, IL: Wind Advisory

Today: Showers and thunderstorms likely before 3pm, then showers and possibly a thunderstorm between 3pm and 5pm, then showers and thunderstorms likely after 5pm. High near 73. Windy, with a south wind 17 to 22 mph increasing to 27 to 32 mph in the afternoon. Winds could gust as high as 46 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Tonight: Showers and thunderstorms likely before 1am, then a chance of showers. Mostly cloudy, with a low around 58. Breezy, with a south wind 21 to 26 mph becoming west 9 to 14 mph after midnight. Winds could gust as high as 38 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

Friday: A slight chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 77. West southwest wind 5 to 15 mph becoming south in the morning. Winds could gust as high as 23 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday Night: Showers and possibly a thunderstorm. Low around 58. South wind 13 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

Saturday: Showers likely before 1pm. Mostly cloudy, with a high near 62. West wind 13 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

Saturday Night: Partly cloudy, with a low around 37. West northwest wind 13 to 15 mph, with gusts as high as 24 mph.

Sunday: Mostly sunny, with a high near 53. West northwest wind around 14 mph, with gusts as high as 23 mph.

Sunday Night: Mostly clear, with a low around 36.

Monday: Sunny, with a high near 59.

Monday Night: Partly cloudy, with a low around 34.

Tuesday: Mostly sunny, with a high near 56.

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

Wednesday: Mostly sunny, with a high near 66.

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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 is Hail?

Home - Education - Precipitation - Hail

Hail Next Topic: Hole Punch Clouds

Hail is a form of precipitation which is recognized by large solid balls or clumps of ice. Hail is created by thunderstorm clouds with strong updrafts of wind. As the hailstones remain in the updraft, ice is deposited onto them until their weight becomes heavy enough for them to fall to the earth's surface.

Hail storms can cause significant damage to crops, aircrafts, and man-made structures, despite the fact that the duration is usually less than ten minutes.

Next Topic: Hole Punch Clouds

Weather Topic: What are Mammatus Clouds?

Home - Education - Cloud Types - Mammatus Clouds

Mammatus Clouds Next Topic: Nimbostratus Clouds

A mammatus cloud is a cloud with a unique feature which resembles a web of pouches hanging along the base of the cloud.

In the United States, mammatus clouds tend to form in the warmer months, commonly in the Midwest and eastern regions.

While they usually form at the bottom of a cumulonimbis cloud, they can also form under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds warn that severe weather is close.

Next Topic: Nimbostratus Clouds