Weather Alert in Illinois
Flood Advisory issued August 12 at 3:59PM CDT until August 12 at 6:45PM CDT by NWS Chicago IL
AREAS AFFECTED: Cook, IL
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall continues. * WHERE...A portion of northeast Illinois, including the following county, Cook. * WHEN...Until 645 PM CDT. * IMPACTS...Flooding may occur in poor drainage and urban areas. Roads and streets may be flooded. * ADDITIONAL DETAILS... - At 357 PM CDT, Doppler radar indicated heavy rain due to thunderstorms with rates up to 3 inches per hour. Heaviest rainfall was located across northwestern and northern Chicago. Up to 2 inches of rain has fallen near Elmwood Park and Rogers Park area of Chicago. - Some locations that will experience flooding include... Chicago, Cicero, Evanston, Skokie, Des Plaines, Berwyn, Oak Park, Glenview, Ohare Airport, Park Ridge, Niles, Austin, Irving Park, South Lawndale, West Town, West Ridge, Lake View, Lincoln Park, Midway Airport 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 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
Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
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