Weather Alert in Iowa
Flood Warning issued August 2 at 3:06AM CDT until August 3 at 3:00PM CDT by NWS Des Moines IA
AREAS AFFECTED: Poweshiek, IA; Tama, 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...Moderate flooding is occurring and moderate flooding is forecast. * WHERE...The Iowa River near Tama Hwy E49, or from Timber Creek near Le Grand to Salt Creek near Belle Plaine. * WHEN...Until tomorrow afternoon. * IMPACTS...At 13.4 feet, Water affects portions of 340th St at H Ave. * ADDITIONAL DETAILS... - At 2:00 AM CDT Saturday the stage was 13.4 feet. - Forecast...The river is expected to fall below flood stage late tomorrow morning and continue falling to 9.6 feet Friday evening. - Flood stage is 12.5 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 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
Weather Topic: What is Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
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