Forecast Details for Decatur, IL

Recent Locations: Decatur, IL  
Today: A 20 percent chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 85. East wind 8 to 17 mph becoming south in the morning. Winds could gust as high as 25 mph.
Tonight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 62. Southwest wind 7 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday: Showers likely and possibly a thunderstorm before 10am, then a chance of showers and thunderstorms after 10am. Mostly cloudy, with a high near 74. North wind 6 to 10 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday Night: Partly cloudy, with a low around 55. Northeast wind 7 to 10 mph.
Saturday: A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 77. East wind around 7 mph becoming south southwest in the afternoon. Chance of precipitation is 30%.
Saturday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 57. West southwest wind around 9 mph becoming northwest in the evening. Chance of precipitation is 30%.
Sunday: Partly sunny, with a high near 74. Northeast wind around 10 mph, with gusts as high as 15 mph.
Sunday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 58. Chance of precipitation is 30%.
Monday: A 50 percent chance of showers. Partly sunny, with a high near 77.
Monday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 65. Chance of precipitation is 50%.
Tuesday: Showers and thunderstorms likely. Partly sunny, with a high near 82. Breezy.
Tuesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 62. Breezy.
Wednesday: A chance of showers. Mostly sunny, with a high near 83.

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Current U.S. National Radar--Current

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Weather Topic: What are Shelf Clouds?

Home - Education - Cloud Types - Shelf Clouds

Shelf Clouds Next Topic: Sleet

A shelf cloud is similar to a wall cloud, but forms at the front of a storm cloud, instead of at the rear, where wall clouds form.

A shelf cloud is caused by a series of events set into motion by the advancing storm; first, cool air settles along the ground where precipitation has just fallen. As the cool air is brought in, the warmer air is displaced, and rises above it, because it is less dense. When the warmer air reaches the bottom of the storm cloud, it begins to cool again, and the resulting condensation is a visible shelf cloud.

Next Topic: Sleet

Weather Topic: What is Snow?

Home - Education - Precipitation - Snow

Snow Next Topic: Stratocumulus Clouds

Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake, has unique characteristics, but all of them grow in a hexagonal structure. Snowfall can last for sustained periods of time and result in significant buildup of snow on the ground.

On the earth's surface, snow starts out light and powdery, but as it begins to melt it tends to become more granular, producing small bits of ice which have the consistency of sand. After several cycles of melting and freezing, snow can become very dense and ice-like, commonly known as snow pack.

Next Topic: Stratocumulus Clouds