Forecast Details for Sullivan, IL

Recent Locations: Stringtown, OK Saint Marys, PA Sullivan, IL

Current Alerts for Sullivan, IL: Wind Advisory

Overnight: A 30 percent chance of showers and thunderstorms. Cloudy, with a steady temperature around 55. Southeast wind around 14 mph, with gusts as high as 21 mph.

Thursday: Showers and thunderstorms likely before 4pm, then showers and possibly a thunderstorm between 4pm and 5pm, then showers and thunderstorms likely after 5pm. High near 74. Windy, with a south wind 16 to 21 mph increasing to 25 to 30 mph in the afternoon. Winds could gust as high as 47 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Thursday Night: Showers and thunderstorms likely before 4am, then a slight chance of showers. Mostly cloudy, with a low around 60. Breezy, with a south wind 19 to 24 mph decreasing to 10 to 15 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. South southwest wind 7 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Friday Night: Showers and possibly a thunderstorm. Low around 60. South wind 13 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

Saturday: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 63. West wind 14 to 17 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 37. West northwest wind 13 to 15 mph, with gusts as high as 23 mph.

Sunday: Sunny, with a high near 53.

Sunday Night: Mostly clear, with a low around 35.

Monday: Sunny, with a high near 59.

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

Tuesday: Mostly sunny, with a high near 55.

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

Wednesday: Mostly sunny, with a high near 65.

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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)

This map shows recent moisture content over North America. Bright and colored areas show high moisture (ie, clouds); brown indicates very little moisture present; black indicates no moisture.

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