Weather Alert in Illinois
Flash Flood Warning issued April 29 at 1:50PM CDT until April 29 at 4:45PM CDT by NWS St Louis MO
AREAS AFFECTED: Washington, IL
DESCRIPTION: FFWLSX The National Weather Service in St Louis has issued a * Flash Flood Warning for... Washington County in south central Illinois... * Until 445 PM CDT. * At 150 PM CDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 1 and 2 inches of rain have fallen. Additional rainfall amounts of 1 to 2 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar indicated. IMPACT...Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. * Some locations that will experience flash flooding include... Nashville, Okawville, Wamac, Lively Grove, Irvington, Ashley, Posen, Beaucoup, Hoyleton, Johannisburg, Covington, Richview, Addieville, Oakdale, Radom, New Minden, Du Bois, Venedy, Cordes and Huegely. This includes Interstate 64 in Illinois between exits 41 and 61.
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.
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Weather Topic: What are Wall Clouds?
Home - Education - Cloud Types - Wall Clouds
Next Topic: Altocumulus Clouds
A wall cloud forms underneath the base of a cumulonimbus cloud,
and can be a hotbed for deadly tornadoes.
Wall clouds are formed by air flowing into the cumulonimbus clouds, which can
result in the wall cloud descending from the base of the cumulonimbus cloud, or
rising fractus clouds which join to the base of the storm cloud as the wall cloud
takes shape.
Wall clouds can be very large, and in the Northern Hemisphere they generally
form at the southern edge of cumulonimbus clouds.
Next Topic: Altocumulus Clouds
Weather Topic: What are Altostratus Clouds?
Home - Education - Cloud Types - Altostratus Clouds
Next Topic: Cirrocumulus Clouds
Altostratus clouds form at mid to high-level altitudes
(between 2 and 7 km) and are created by a warm, stable air mass which causes
water vapor
to condense as it rise through the atmosphere. Usually altostratus clouds are
featureless sheets characterized by a uniform color.
In some cases, wind punching through the cloud formation may give it a waved
appearance, called altostratus undulatus. Altostratus clouds
are commonly seen with other cloud formations accompanying them.
Next Topic: Cirrocumulus Clouds
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