Weather Alert in Wyoming

Recent Locations: Boulder, WY

Winter Weather Advisory issued February 8 at 3:11PM MST until February 9 at 5:00PM MST by NWS Riverton WY

AREAS AFFECTED: Yellowstone National Park

DESCRIPTION: * WHAT...Snow expected. Total snow accumulations of 7 to 12 inches south and east of the Lower Loop of Yellowstone National Park. Isolated higher amounts up to 15 inches are possible over the highest terrain. Total accumulations of 3 to 6 inches along the Upper Loop and northern portions of the Lower Loop. Accumulations of 1 to 3 inches near Mammoth. Gusty 25 to 35 mph winds are expected. * WHERE...Yellowstone National Park. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be difficult. * ADDITIONAL DETAILS...The period of heaviest snowfall is forecast to occur between 11 PM Sunday and 11 AM Monday with snow rates up to 1 inch per hour possible.

INSTRUCTION: Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info .

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Weather Topic: What are Wall Clouds?

Home - Education - Cloud Types - Wall Clouds

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