Weather Alert in Iowa
Winter Weather Advisory issued February 19 at 2:41AM CST until February 20 at 6:00AM CST by NWS La Crosse WI
AREAS AFFECTED: Allamakee; Fayette; Clayton; Monroe; Juneau; Adams; Vernon; Crawford; Richland; Grant
DESCRIPTION: ...A QUICK HITTING BAND OF HEAVY SNOW TONIGHT WILL LEAD TO SLIPPERY TRAVEL CONDITIONS... .A band of snow develops across northeast Iowa into southwest Wisconsin this evening and lasts through the overnight, departing around sunrise. The snow will be heavy at times with rates exceeding 1" per hour and quickly lead to snow-covered and slippery roads. The heaviest snow is forecast to fall in a relatively narrow band with amounts quickly decreasing on either side of the band, making this snowfall forecast on the challenging side. Any small changes to the placement of the snow band could change forecast snow amounts at a given location very quickly. * WHAT...Snow with total accumulations between 2 and 5 inches. A narrow corridor of 6 inches is possible within the advisory, but confidence in its placement is low at this time. * WHERE...Portions of northeast Iowa and central, southwest, and west central Wisconsin. * WHEN...From 8 PM this evening to 6 AM CST Friday. * IMPACTS...Plan on slippery road conditions.
INSTRUCTION: Slow down and use caution while traveling. In Iowa, visit 511ia.org for road conditions. In Wisconsin, visit 511wi.gov for road conditions.
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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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