Weather Alert in Iowa
Flood Warning issued July 30 at 8:47PM CDT until August 3 at 9:00PM 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. Winnebago River at Mason City affecting Cerro Gordo, Floyd and Worth Counties. Shell Rock River at Shell Rock affecting Bremer, Black Hawk and Butler Counties. * WHAT...Minor 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 late Sunday evening. * IMPACTS...At 13.4 feet, Water affects portions of 340th St at H Ave. * ADDITIONAL DETAILS... - At 8:00 PM CDT Wednesday the stage was 12.8 feet. - Forecast...The river is expected to rise to a crest of 13.4 feet Friday evening. It will then fall below flood stage Sunday afternoon. - 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 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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