Weather Alert in Illinois

Flood Warning issued April 29 at 9:43AM CDT until May 7 at 4:36AM CDT by NWS St Louis MO

AREAS AFFECTED: Clinton, IL

DESCRIPTION: ...The Flood Warning continues for the following rivers in Illinois... Kaskaskia River at Carlyle. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Kaskaskia River at Carlyle. * WHEN...Until Wednesday, May 07. * ADDITIONAL DETAILS... - At 9:30 AM CDT Tuesday the stage was 21.7 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 9:30 AM CDT Tuesday was 21.7 feet. - Forecast...The river will fall to 20.4 feet early Friday morning. It will then rise to 20.5 feet Friday morning. It will fall to 19.2 feet early Saturday morning. It will then rise to 19.3 feet Sunday morning. It will fall below flood stage late Monday evening. - Flood stage is 16.5 feet.

INSTRUCTION: Motorists should not attempt to drive around barricades or drive cars through flooded areas. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx

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Weather Topic: What is Precipitation?

Home - Education - Precipitation - 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.

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Weather Topic: What are Shelf Clouds?

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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.

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