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 is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
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
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