Weather Alert in Illinois
Flood Advisory issued August 11 at 9:43PM CDT until August 12 at 12:45AM CDT by NWS Chicago IL
AREAS AFFECTED: Cook, IL; DuPage, IL; Will, IL
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall is expected. * WHERE...A portion of northeast Illinois, including the following counties, Cook, DuPage and Will. * WHEN...Until 1245 AM CDT. * IMPACTS...Flooding may occur in poor drainage and urban areas, including flooded underpasses, roads, and streets. * ADDITIONAL DETAILS... - At 940 PM CDT, Doppler radar indicated heavy rain producing thunderstorms over the area. Up to 1.5 inches of rain have fallen according to radar estimates and personal weather station observations. - Additional rainfall amounts up to 1 inch are possible over portions of the advisory area. This additional rain will result in flooding. - Some locations that will experience flooding include... Downtown Chicago, Naperville, Cicero, Bolingbrook, Oak Lawn, Berwyn, Wheaton, Oak Park, Downers Grove, Elmhurst, Lombard, Addison, Woodridge, Austin, Midway Airport, South Lawndale, Chicago Lawn, Irving Park, West Town and Bridgeport. - http://www.weather.gov/safety/flood
INSTRUCTION: A Flood Advisory means minor flooding along waterways and other poor drainage areas is imminent or may already be occurring. Persons in the advisory area should use caution and avoid flood waters.
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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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