Weather Alert in Iowa
Flood Watch issued August 25 at 8:33AM CDT until August 30 at 7:00PM CDT by NWS Quad Cities IA IL
AREAS AFFECTED: Clinton; Scott
DESCRIPTION: ...The Flood Watch is extended for the following rivers in Iowa... Wapsipinicon River near De Witt 4S affecting Clinton and Scott Counties. * WHAT...Flooding is possible. * WHERE...Wapsipinicon River near De Witt 4S. * WHEN...From late Wednesday night to Saturday evening. * IMPACTS...At 11.5 feet, Moderate Flood Stage. Water affects homes along old U.S. Highway 61. * ADDITIONAL DETAILS... - At 7:30 AM CDT Monday the stage was 9.4 feet. - Forecast...Flood stage may be reached early Thursday morning. - Flood stage is 11.0 feet.
INSTRUCTION: If you are in the watch area, remain alert to possible flooding. The next statement will be issued by Tuesday morning at 845 AM CDT.
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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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