Weather Alert in Illinois
Flood Advisory issued August 11 at 11:51PM CDT until August 12 at 1:45AM CDT by NWS Chicago IL
AREAS AFFECTED: Cook, IL
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall is expected. * WHERE...A portion of northeast Illinois, including the following county, Cook. * WHEN...Until 145 AM CDT. * IMPACTS...Flooding may occur in poor drainage and urban areas, including flooded underpasses, roads, and streets. * ADDITIONAL DETAILS... - At 1148 PM CDT, Doppler radar indicated heavy rain producing thunderstorms over the advisory area. Between 1 and 2 inches of rain have fallen this evening in the current and previous rounds of storms. - Additional rainfall amounts up to 1 inch are possible over portions of the advisory area. Runoff from the rain that has fallen and continues to fall will result in flooding. - Some locations that will experience flooding include... Evanston, Skokie, Niles, West Ridge, Albany Park, Rogers Park, Edgewater, Portage Park, Uptown, Dunning, Morton Grove, Lincolnwood, Harwood Heights, Lincoln Square, Norwood Park, Jefferson Park, Forest Glen and North Park. - http://www.weather.gov/safety/flood
INSTRUCTION: A Flood Advisory means flooding along poor drainage areas is imminent or may already be occurring. Persons in the advisory area should use caution and avoid flood waters. Be especially cautious at night when it is harder to recognize the dangers of flooding.
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Weather Topic: What is Graupel?
Home - Education - Precipitation - Graupel
Next Topic: Hail
Graupel is a form of precipitation that is created by atmospheric conditions
which cause supercooled water droplets to contact snow crystals and freeze to
their surface.
Sometimes known as soft hail or snow pellets, graupel is delicate and easily
destroyed by touch. Whereas hail usually falls during severe weather, graupel
doesn't require such conditions to form, and can form in mild precipitation
similar to situations which produce snowfall.
Next Topic: Hail
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
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