Weather Alert in Illinois
Flood Advisory issued June 30 at 8:04PM CDT until June 30 at 11:00PM CDT by NWS St Louis MO
AREAS AFFECTED: Bond, IL; Clinton, IL; Fayette, IL; Marion, IL; St. Clair, IL; Washington, IL
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall is occurring. * WHERE...Portions of south central and southwest Illinois, including the following counties, in south central Illinois, Bond, Clinton, southwestern Fayette, Marion and Washington. In southwest Illinois, east central Saint Clair. * WHEN...Until 1100 PM CDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Water over roadways. * ADDITIONAL DETAILS... - At 803 PM CDT, Doppler radar indicated heavy rain due to thunderstorms. Overflowing poor drainage areas will cause minor flooding in the advisory area. Between 2 and 3 inches of rain have fallen. - Local emergency management officials reported water over roadways. - Some locations that will experience flooding include... Centralia, Salem, Greenville, Breese, New Baden, Carlyle, Nashville, Trenton, Aviston, Okawville, St. Rose, Sandoval, Germantown, Albers, Wamac, Central City, Odin, Beckemeyer, Kinmundy and Pocahontas.
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.
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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
Weather Topic: What is Snow?
Home - Education - Precipitation - 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
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