Weather Alert in Iowa
Winter Weather Advisory issued February 19 at 10:45AM CST until February 20 at 6:00AM CST by NWS Des Moines IA
AREAS AFFECTED: Wright; Jasper; Poweshiek; Warren; Marion
DESCRIPTION: Precipitation will spread from western into central Iowa this afternoon and evening. Initially, it may begin as a rain/snow mix across southern and western Iowa before changing to snow. A band of 5 to 8 inches of snow is expected by Friday morning from western through central to northeastern Iowa. There will be a sharp gradient of snowfall on either side of the heaviest band of snow. Snow rates may exceed 1" per hour at times this evening leading to rapid snow accumulations on roads and slick travel conditions. A small change in the location of the band could alter forecast snow amounts. * WHAT...Snow expected. Total snow accumulations between 2 and 4 inches. * WHERE...Jasper, Poweshiek, Wright, Marion, and Warren Counties. * WHEN...From 6 PM this evening to 6 AM CST Friday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Thursday evening commute.
INSTRUCTION: Slow down and use caution while traveling. For the latest travel conditions, check the Iowa 511 app, www.511ia.org, or dial 511.
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North America Water Vapor (Moisture)
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Weather Topic: What are Wall Clouds?
Home - Education - Cloud Types - Wall Clouds
Next Topic: Altocumulus Clouds
A wall cloud forms underneath the base of a cumulonimbus cloud,
and can be a hotbed for deadly tornadoes.
Wall clouds are formed by air flowing into the cumulonimbus clouds, which can
result in the wall cloud descending from the base of the cumulonimbus cloud, or
rising fractus clouds which join to the base of the storm cloud as the wall cloud
takes shape.
Wall clouds can be very large, and in the Northern Hemisphere they generally
form at the southern edge of cumulonimbus clouds.
Next Topic: Altocumulus Clouds
Weather Topic: What are Altostratus Clouds?
Home - Education - Cloud Types - Altostratus Clouds
Next Topic: Cirrocumulus Clouds
Altostratus clouds form at mid to high-level altitudes
(between 2 and 7 km) and are created by a warm, stable air mass which causes
water vapor
to condense as it rise through the atmosphere. Usually altostratus clouds are
featureless sheets characterized by a uniform color.
In some cases, wind punching through the cloud formation may give it a waved
appearance, called altostratus undulatus. Altostratus clouds
are commonly seen with other cloud formations accompanying them.
Next Topic: Cirrocumulus Clouds
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