Weather Alert in Iowa
Flood Warning issued August 19 at 7:59PM CDT until August 22 at 1:00PM CDT by NWS Des Moines IA
AREAS AFFECTED: Black Hawk, IA; Bremer, IA; Butler, IA
DESCRIPTION: ...The Flood Warning continues for the following rivers in Iowa... Cedar River at Cedar Falls affecting Black Hawk County. Shell Rock River at Shell Rock affecting Bremer, Black Hawk and Butler Counties. ...The Flood Warning is extended for the following rivers in Iowa... Winnebago River at Mason City affecting Worth, Floyd and Cerro Gordo Counties. * WHAT...Minor flooding is forecast. * WHERE...The Shell Rock River at Shell Rock, or from Flood Creek near Clarksville to the Cedar River. * WHEN...Until early Friday afternoon. * IMPACTS...At 12.5 feet, Seepage occurs in several basements close to the river. * ADDITIONAL DETAILS... - At 6:45 PM CDT Tuesday the stage was 11.9 feet. - Forecast...The river is expected to rise above flood stage this evening to a crest of 12.6 feet early tomorrow afternoon. It will then fall below flood stage Friday morning. - Flood stage is 12.0 feet.
INSTRUCTION: For the latest stream observations and forecasts refer to weather.gov/desmoines/water. Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. River forecasts include observed precipitation plus forecast precipitation over the next 24 hours.
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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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