Weather Alert in Iowa
Special Weather Statement issued February 20 at 7:11AM CST by NWS Quad Cities IA IL
AREAS AFFECTED: Clinton; Muscatine; Scott; Washington; Louisa; Henry; Des Moines; Stephenson; Carroll; Whiteside; Rock Island; Henry; Bureau; Putnam; Mercer; Henderson; Warren
DESCRIPTION: Snow will continue to move across the area through 830 AM before decreasing. The snow will be light to moderate in intensity at times, which combined with gusty winds of 35 to around 45 mph will reduce visibilities under 1 mile. Most locations will receive additional snowfall of under 1 inch of accumulation. There will also be drifting snow especially across north to south oriented roads. There is also a layer of ice under the snow on untreated roads making for slick conditions. Roads, bridges, and overpasses will be slick and hazardous due to the snowfall, underlying ice, and temperatures dropping below the freezing mark. If driving, slow down and allow extra following distance, and plan on slippery travel for the rest of the morning commute.
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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