Weather Alert in Iowa
Winter Weather Advisory issued February 20 at 2:07AM CST until February 20 at 9:00AM CST by NWS Quad Cities IA IL
AREAS AFFECTED: Linn; Jones; Jackson; Iowa; Johnson; Cedar; Jo Daviess
DESCRIPTION: * WHAT...Snow expected. Total snow accumulations between 1 and 4 inches, with the highest amounts northwest of a Marengo to Cedar Rapids to Monticello line. Drifting and some blowing snow. Winds gusting as high as 45 mph leading to greatly reduced visibility in falling snow. * WHERE...Portions of northwest Illinois and east central Iowa. * WHEN...Until 9 AM CST this morning. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Friday morning commute. Gusty winds could bring down tree branches.
INSTRUCTION: Slow down and use caution while traveling. In Iowa, the latest road conditions are available at 511ia.org or by calling 511. In Illinois, the latest road conditions are available at gettingaroundillinois.com.
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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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