Weather Alert in Maryland

Recent Locations: Mariposa, CA Granite Falls, MN Saint Michaels, MD

Special Weather Statement issued March 1 at 4:33AM EST by NWS Wakefield VA

AREAS AFFECTED: Inland Worcester; Maryland Beaches; Northampton; Hertford; Gates; Pasquotank; Camden; Western Currituck; Bertie; Chowan; Perquimans; Eastern Currituck; Mecklenburg; Brunswick; Greensville; Accomack; Northampton

DESCRIPTION: Cameras and observations indicate that patchy dense fog has developed in Southern Virginia and Northeast North Carolina. Visibilities will average between one half and two miles, but could drop to less than a mile at times. The fog will persist through around or just after sunrise. Motorists should be alert for sudden changes in visibility due to the areas of fog. Drive at reduced speeds and use low beam headlights only.

INSTRUCTION: N/A

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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