Weather Alert in Iowa
Special Weather Statement issued August 28 at 5:59PM CDT by NWS La Crosse WI
AREAS AFFECTED: Mitchell; Howard; Floyd; Chickasaw; Fayette; Mower
DESCRIPTION: Funnel clouds have been reported near Hawkeye, Iowa during the past few minutes. These funnel clouds normally do not touch the ground. As a result, they rarely do any damage and last only a few minutes. Additional funnel clouds may develop along a line of weak showers that stretch from neat Austin, Minnesota to Oelwein, Iowa. Folks along this line should remain on the alert and be prepared to move to a place of safety if a funnel should approach the ground. Conditions will become less favorable in the next hour or so.
INSTRUCTION: N/A
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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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