Weather Alert in South Dakota
Winter Weather Advisory issued February 18 at 1:33AM MST until February 19 at 5:00PM MST by NWS Rapid City SD
AREAS AFFECTED: Northern Black Hills; Northern Foothills; Southern Foothills; Central Black Hills; Southern Black Hills; Eastern Fall River; Southern Oglala Lakota; Wyoming Black Hills
DESCRIPTION: * WHAT...Snow and patchy blowing snow expected. Total snow accumulations between 3 and 6 inches. Winds gusting as high as 35 mph. * WHERE...Portions of northwestern, southwestern, and the Black Hills of South Dakota and the Black Hills of Wyoming. * WHEN...From 11 PM this evening to 5 PM MST Thursday. * IMPACTS...Plan on slippery road conditions. The combination of falling snow and winds will lead to periods of blowing snow that may briefly reduce visibility. The hazardous conditions could impact the Thursday morning and evening commutes.
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 Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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