Weather Alert in Wisconsin
Special Weather Statement issued May 12 at 3:16AM CDT by NWS Twin Cities/Chanhassen MN
AREAS AFFECTED: Pepin; Chippewa; Eau Claire
DESCRIPTION: Temperatures rising to the mid 80s this afternoon within a dry environment will cause minimum relative humidity values to drop to between 20 and 25 percent. Southerly winds of 10 to 15 mph with gusts of 20 to 25 mph are expected. Any areas with dry grasses or vegetation will be susceptible to elevated fire weather conditions. Check with the WI DNR or your local county before attempting any outdoor burning.
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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