Weather Alert in Iowa
Flood Warning issued August 2 at 3:06AM CDT until August 3 at 1:00AM 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... Iowa River near Tama Hwy E49 affecting Tama and Poweshiek Counties. Cedar River at Cedar Falls affecting Black Hawk County. Shell Rock River at Shell Rock affecting Bremer, Butler and Black Hawk Counties. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...The Shell Rock River at Shell Rock, or from Flood Creek near Clarksville to the Cedar River. * WHEN...Until just after midnight tonight. * IMPACTS...At 12.5 feet, Seepage occurs in several basements close to the river. * ADDITIONAL DETAILS... - At 1:45 AM CDT Saturday the stage was 12.7 feet. - Forecast...The river is expected to fall below flood stage this evening and continue falling to 10.3 feet Friday evening. - Flood stage is 12.0 feet.
INSTRUCTION: For the latest waterway 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 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
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
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