Weather Alert in Iowa
Special Weather Statement issued February 19 at 5:02PM CST by NWS Des Moines IA
AREAS AFFECTED: Clarke; Lucas; Ringgold; Decatur; Wayne
DESCRIPTION: WHAT...Thunderstorms in south central Iowa are producing quick accumulations of sleet in isolated areas. This may result in reduced visibility and slick roads. WHERE...South central Iowa including the I-35 corridor WHEN...until 7pm IMPACTS...Hazardous driving conditions and slower than normal commute times due to sleet quickly covering roads and reducing visibility. PREPAREDNESS AND PRECAUTIONARY ACTIONS...Motorists should be careful and prepare for quick changes in visibility and road conditions in a short distance as snow showers move in and out of an area.
INSTRUCTION: N/A
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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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