Weather Alert in Wisconsin
Special Weather Statement issued March 27 at 11:45AM CDT by NWS Twin Cities/Chanhassen MN
AREAS AFFECTED: Polk; Barron; Rusk; St. Croix; Pierce; Dunn; Pepin; Chippewa; Eau Claire
DESCRIPTION: The combination warmer temperatures into the 50s, low relative humidity values between 20 and 25 percent, southwest winds gusting to 30 to 35 mph and dry fuels will lead to elevated fire weather conditions across west central Wisconsin on Saturday. All of these weather elements with the dry fuels will contribute to an increased danger of rapidly spreading fires. Outdoor burning is discouraged under these conditions. Take care to prevent the start of accidental fires when smoking or operating vehicles within or around dry vegetation.
INSTRUCTION: N/A
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Weather Topic: What are Cirrus Clouds?
Home - Education - Cloud Types - Cirrus Clouds
Next Topic: Condensation
Cirrus clouds are high-level clouds that occur above 20,000 feet
and are composed mainly of ice crystals.
They are thin and wispy in appearance.
What do they indicate?
They are often the first sign of an approaching storm.
Next Topic: Condensation
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
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