Weather Alert in Wisconsin
Special Weather Statement issued August 28 at 5:49AM CDT by NWS Green Bay WI
AREAS AFFECTED: Marathon; Wood; Portage; Waupaca; Waushara
DESCRIPTION: Fog has formed over portions of central WI this morning as the rain from overnight has ended. The fog may be locally dense, with visibility less than one-half mile at times. The fog will diminish after 8 am this morning. Motorists traveling across portions of central Wisconsin should expect locally hazardous travel conditions, with rapidly changing and poor visibilities at times. When driving in fog, remember to slow down, turn on your low-beam headlights, and maintain a safe distance between you and the car in front of you.
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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