Weather Alert in Illinois
Flood Advisory issued August 12 at 7:53PM CDT until August 12 at 8:45PM CDT by NWS Chicago IL
AREAS AFFECTED: Cook, IL; DuPage, IL; Will, IL
DESCRIPTION: * WHAT...Lingering flooding due to earlier heavy rainfall is occurring. * WHERE...A portion of northeast Illinois, including the following counties, Cook, DuPage and Will. * WHEN...Until 845 PM CDT. * IMPACTS...Flooding is ongoing in areas of poor drainage such as low-lying ditches, roadways, and streams. * ADDITIONAL DETAILS... - At 752 PM CDT, Doppler radar and automated rain gauges indicated that between 2 and 4 inches of rain fell in 1 to 2 hours. - Some locations that will experience flooding include... Chicago, Naperville, Cicero, Bolingbrook, Oak Lawn, Berwyn, Oak Park, Downers Grove, Elmhurst, Lombard, Romeoville, Woodridge, Midway Airport, Austin, South Lawndale, Chicago Lawn, Englewood, Bridgeport, West Town and Chicago Loop. - 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 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
Weather Topic: What is Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
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