Weather Alert in Illinois
Special Weather Statement issued February 5 at 3:27PM CST by NWS Chicago IL
AREAS AFFECTED: Winnebago; Boone; Ogle; Lee; De Kalb; La Salle; Kendall; Grundy; Kankakee; Livingston; Iroquois; Ford; Benton
DESCRIPTION: A fast moving weather system will produce a short 3 to 5 hour period of freezing drizzle late tonight into early Friday morning. While significant ice amounts are not expected, a minor glaze of ice will be possible on untreated surfaces such as sidewalks and side streets. Accordingly, motorists and walkers should be prepared for the possibility of some slick surfaces early Friday morning.
INSTRUCTION: N/A
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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
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
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