Weather Alert in Iowa
Winter Weather Advisory issued February 19 at 2:41AM CST until February 20 at 6:00AM CST by NWS La Crosse WI
AREAS AFFECTED: Allamakee; Fayette; Clayton; Monroe; Juneau; Adams; Vernon; Crawford; Richland; Grant
DESCRIPTION: ...A QUICK HITTING BAND OF HEAVY SNOW TONIGHT WILL LEAD TO SLIPPERY TRAVEL CONDITIONS... .A band of snow develops across northeast Iowa into southwest Wisconsin this evening and lasts through the overnight, departing around sunrise. The snow will be heavy at times with rates exceeding 1" per hour and quickly lead to snow-covered and slippery roads. The heaviest snow is forecast to fall in a relatively narrow band with amounts quickly decreasing on either side of the band, making this snowfall forecast on the challenging side. Any small changes to the placement of the snow band could change forecast snow amounts at a given location very quickly. * WHAT...Snow with total accumulations between 2 and 5 inches. A narrow corridor of 6 inches is possible within the advisory, but confidence in its placement is low at this time. * WHERE...Portions of northeast Iowa and central, southwest, and west central Wisconsin. * WHEN...From 8 PM this evening to 6 AM CST Friday. * IMPACTS...Plan on slippery road conditions.
INSTRUCTION: Slow down and use caution while traveling. In Iowa, visit 511ia.org for road conditions. In Wisconsin, visit 511wi.gov for road conditions.
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Weather Topic: What are Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds
Weather Topic: What is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
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