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 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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