Weather Alert in Illinois
Severe Thunderstorm Watch issued April 29 at 10:23AM CDT until April 29 at 3:00PM CDT by NWS St Louis MO
AREAS AFFECTED: Bond, IL; Clinton, IL; Fayette, IL; Madison, IL; Marion, IL; St. Louis, MO; St. Louis City, MO
DESCRIPTION: THE NATIONAL WEATHER SERVICE HAS EXTENDED SEVERE THUNDERSTORM WATCH 187 TO INCLUDE THE FOLLOWING AREAS UNTIL 3 PM CDT THIS AFTERNOON IN ILLINOIS THIS WATCH INCLUDES 5 COUNTIES IN SOUTH CENTRAL ILLINOIS BOND CLINTON FAYETTE MARION IN SOUTHWEST ILLINOIS MADISON IN MISSOURI THIS WATCH INCLUDES 2 COUNTIES IN EAST CENTRAL MISSOURI SAINT LOUIS SAINT LOUIS CITY THIS INCLUDES THE CITIES OF ALTON, CENTRALIA, EDWARDSVILLE, SAINT LOUIS, SALEM, AND VANDALIA.
INSTRUCTION: N/A
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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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