Weather Alert in Iowa
Special Weather Statement issued August 12 at 4:01AM CDT by NWS Sioux Falls SD
AREAS AFFECTED: Lyon; Osceola; Dickinson; Sioux; O'Brien; Clay; Plymouth; Cherokee; Buena Vista; Woodbury; Ida; Dixon; Dakota; Clay; Union
DESCRIPTION: Areas of fog occasionally reducing visibility to around a half mile have developed early this morning. Travelers should be prepared for rapidly deteriorating or changing visibility, and use extra caution at intersections, railroad crossings, and school bus stops. The fog is expected to improve by mid morning.
INSTRUCTION: N/A
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Weather Topic: What is Hail?
Home - Education - Precipitation - Hail
Next Topic: Hole Punch Clouds
Hail is a form of precipitation which is recognized by large solid balls or
clumps of ice. Hail is created by thunderstorm clouds with strong updrafts of wind.
As the hailstones remain in the updraft, ice is deposited onto them until their
weight becomes heavy enough for them to fall to the earth's surface.
Hail storms can cause significant damage to crops, aircrafts, and man-made structures,
despite the fact that the duration is usually less than ten minutes.
Next Topic: Hole Punch Clouds
Weather Topic: What are Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds
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