Forecast Details for Decatur, IL

Recent Locations: Heiskell, TN Mapleton, MN Decatur, IL

Current Alerts for Decatur, IL: Wind Advisory

Overnight: A 50 percent chance of showers and thunderstorms. Cloudy, with a steady temperature around 53. East southeast wind around 15 mph, with gusts as high as 22 mph.

Thursday: 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 between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday Night: 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: 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.

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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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 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

Weather Topic: What is Precipitation?

Home - Education - Precipitation - Precipitation

Next Topic: Rain

Precipitation can refer to many different forms of water that may fall from clouds. Precipitation occurs after a cloud has become saturated to the point where its water particles are more dense than the air below the cloud.

In most cases, precipitation will reach the ground, but it is not uncommon for precipitation to evaporate before it reaches the earth's surface. When precipitation evaporates before it contacts the ground it is called Virga. Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog and mist are not considered precipitation because the water vapor which constitutes them isn't dense enough to fall to the ground.

Next Topic: Rain