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 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
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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