Weather Alert in Wisconsin
Special Weather Statement issued February 18 at 7:53AM CST by NWS Green Bay WI
AREAS AFFECTED: Vilas; Oneida; Forest; Florence; Northern Marinette County; Northern Oconto County
DESCRIPTION: A mix of moderate to heavy snow and sleet was occurring across far northern Wisconsin this morning, and will persist near the the Upper Michigan border until around 10 am. The heaviest snow will occur over Vilas, northern Forest, Florence and northern Marinette counties, where accumulations of 1 to 2 inches an hour are possible. On the southern periphery of the heavy snow area, a mix of moderate snow and sleet is expected. Snow and ice covered roads and reduced visibilities will result in hazardous travel conditions until around 10 am. The heaviest snow accumulations; perhaps as high as 6 inches, are expected across Vilas, northern Forest and Florence counties. The heavy concrete nature of the snow will result in tree damage and sporadic power outages. Motorists should use extreme caution, as visibilities will be reduced to less than 1/4 mile at times, and roads will be snow or ice covered and hazardous.
INSTRUCTION: N/A
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Weather Topic: What are Contrails?
Home - Education - Cloud Types - Contrails
Next Topic: Cumulonimbus Clouds
A contrail is an artificial cloud, created by the passing of an
aircraft.
Contrails form because water vapor in the exhaust of aircraft engines is suspended
in the air under certain temperatures and humidity conditions. These contrails
are called exhaust contrails.
Another type of contrail can form due to a temporary reduction in air pressure
moving over the plane's surface, causing condensation.
These are called aerodynamic contrails.
When you can see your breath on a cold day, it is also because of condensation.
The reason contrails last longer than the condensation from your breath is
because the water in contrails freezes into ice particles.
Next Topic: Cumulonimbus Clouds
Weather Topic: What are Cumulus Clouds?
Home - Education - Cloud Types - Cumulus Clouds
Next Topic: Drizzle
Cumulus clouds are fluffy and textured with rounded tops, and
may have flat bottoms. The border of a cumulus cloud
is clearly defined, and can have the appearance of cotton or cauliflower.
Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall,
becoming cumulus congestus and possibly the even taller cumulonimbus clouds.
When cumulus clouds become taller, they have a greater chance of producing precipitation.
Next Topic: Drizzle
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