Weather Alert in Illinois
Severe Thunderstorm Watch issued April 29 at 9:17AM CDT until April 29 at 3:00PM CDT by NWS St Louis MO
AREAS AFFECTED: Monroe, IL; Randolph, IL; St. Clair, IL; Washington, IL; Crawford, MO; Iron, MO; Jefferson, MO; Madison, MO; Reynolds, MO; Ste. Genevieve, MO; St. Francois, MO; Washington, MO
DESCRIPTION: THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 187 IN EFFECT UNTIL 3 PM CDT THIS AFTERNOON FOR THE FOLLOWING AREAS IN ILLINOIS THIS WATCH INCLUDES 4 COUNTIES IN SOUTH CENTRAL ILLINOIS WASHINGTON IN SOUTHWEST ILLINOIS MONROE RANDOLPH SAINT CLAIR IN MISSOURI THIS WATCH INCLUDES 8 COUNTIES IN EAST CENTRAL MISSOURI CRAWFORD JEFFERSON WASHINGTON IN SOUTHEAST MISSOURI IRON MADISON REYNOLDS SAINT FRANCOIS SAINTE GENEVIEVE THIS INCLUDES THE CITIES OF BELLEVILLE, CAHOKIA, CHESTER, FARMINGTON, AND SPARTA.
INSTRUCTION: N/A
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Weather Topic: What are Hole Punch Clouds?
Home - Education - Cloud Types - Hole Punch Clouds
Next Topic: Mammatus Clouds
A hole punch cloud is an unusual occurrence when a disk-shaped
hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.
When part of the cloud forms ice crystals, water droplets in the surrounding area
of the cloud evaporate. The effect of this process produces a large elliptical
gap in the cloud. The hole punch cloud formation is rare, but it is not specific
to any geographic area.
Other names which have been used to describe this phenomena include fallstreak hole,
skypunch, and cloud hole.
Next Topic: Mammatus Clouds
Weather Topic: What are Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
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