Weather Alert in Illinois
Flood Advisory issued April 4 at 3:37PM CDT until April 4 at 6:30PM CDT by NWS St Louis MO
AREAS AFFECTED: Calhoun, IL; Greene, IL; Jersey, IL; Lincoln, MO; St. Charles, MO
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall is expected. * WHERE...Portions of southwest Illinois, including the following counties, southeastern Calhoun, southern Greene and Jersey and east central Missouri, including the following counties, southeastern Lincoln and northwestern Saint Charles. * WHEN...Until 630 PM CDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Rises in small streams and normally dry arroyos. * ADDITIONAL DETAILS... - At 337 PM CDT, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. - Additional rainfall amounts of 1 to 2 inches are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Godfrey, Troy, Jerseyville, Moscow Mills, Carrollton, Brighton, Winfield, Greenfield, Hardin, Grafton, Elsah, West Alton, Portage Des Sioux, Fountain N' Lakes, Chain of Rocks, Old Kane, Kemper, Flint Hill, Kane and Old Monroe.
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.
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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
Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - 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
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