Weather Alert in Iowa
Winter Weather Advisory issued February 27 at 7:10AM CST until February 28 at 6:00PM CST by NWS La Crosse WI
AREAS AFFECTED: Howard; Winneshiek; Allamakee; Dodge; Olmsted; Mower; Fillmore; Houston; Vernon; Crawford; Richland
DESCRIPTION: ...BAND OF HEAVY SNOW SATURDAY... .A narrow band of heavy snow with 1" to 2" per hour snowfall rates likely develops over the Upper Mississippi River Valley Saturday morning into the evening. Heaviest snowfall rates and subsequent amounts will sharply decrease on either side of the band. Therefore, any small change to storm track greatly affects impacts and amounts locally. Current confidence in accumulating snowfall is highest from the Minnesota and Iowa border into western Wisconsin at this time. Longer duration of heavier snowfall may also result in higher amounts. * WHAT...Snow expected. Total snow accumulations between 1 and 3 inches. Localized amounts of over 3 inches are possible. * WHERE...Portions of northeast Iowa, southeast Minnesota, and southwest Wisconsin. * WHEN...From 6 AM to 6 PM CST Saturday. * IMPACTS...Plan on slippery road conditions.
INSTRUCTION: Slow down and use caution while traveling. In Iowa, visit 511ia.org for road conditions. In Minnesota, visit 511mn.org for road conditions. In Wisconsin, visit 511wi.gov for road conditions.
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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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