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 Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
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