Weather Alert in Iowa
Flash Flood Warning issued July 11 at 8:16PM CDT until July 12 at 12:30AM CDT by NWS Quad Cities IA IL
AREAS AFFECTED: Des Moines, IA; Henry, IA; Louisa, IA; Muscatine, IA; Henderson, IL; Mercer, IL; Rock Island, IL
DESCRIPTION: At 816 PM CDT, Louisa County law enforcement reported flooding with road closures impacting T Avenue and other roadways near Conesville. Between 2 and 3 inches of rain have fallen across the warned area. Additional rainfall amounts of 1 to 2 inches are possible in the warned area. Flash flooding is ongoing. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Law enforcement reported. IMPACT...Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. Some locations that will experience flash flooding include... Davenport, Moline, Rock Island, Muscatine, East Moline, Aledo, Wapello, Columbus Junction, Oquawka, Silvis, Milan, Coal Valley, New London, Mediapolis, Buffalo, Andalusia, Winfield, Fruitland, Viola and Morning Sun. This includes the following highways... Interstate 280 between mile markers 11 and 18. Interstate 74 in Illinois between mile markers 2 and 7.
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding. Be aware of your surroundings and do not drive on flooded roads. Please report observed flooding to local emergency services or law enforcement and request they pass this information to the National Weather Service when you can do so safely.
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Weather Topic: What are Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds
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
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