Weather Alert in South Dakota
Winter Weather Advisory issued March 13 at 12:25PM MDT until March 15 at 12:00PM MDT by NWS Rapid City SD
AREAS AFFECTED: Rapid City; Pennington Co Plains; Northern Oglala Lakota; Northern Jackson; Bennett; Mellette; Todd; Tripp; Southern Oglala Lakota; Southern Jackson
DESCRIPTION: * WHAT...Snow and widespread blowing snow expected. Total snow accumulations between 1 and 4 inches. Winds gusting as high as 55 mph. * WHERE...Portions of south central and southwestern South Dakota. * WHEN...From 6 PM MDT /7 PM CDT/ Saturday to noon MDT /1 PM CDT/ Sunday. * IMPACTS...Plan on slippery road conditions. Falling and blowing snow, frequently reducing visibility below a half mile, will make travel dangerous, especially in open country. Strong winds could cause tree damage.
INSTRUCTION: Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.
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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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