Weather Alert in Illinois
Special Weather Statement issued March 7 at 3:34AM CST by NWS Lincoln IL
AREAS AFFECTED: Champaign; Vermilion; Douglas; Coles; Edgar; Cumberland; Clark
DESCRIPTION: At 332 AM CST, Doppler radar was tracking strong thunderstorms along a line extending from Philo to near Effingham. Movement was northeast at 55 mph. HAZARD...Wind gusts up to 50 mph and half inch hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to vegetation is possible. Locations impacted include... Urbana, Danville, Charleston, Mattoon, Paris, Tuscola, Marshall, Arcola, Casey, Neoga, Greenup, Toledo, Savoy, St. Joseph, Georgetown, Tolono, Westville, Tilton, Villa Grove, and Arthur. This includes the following highways... Interstate 57 between mile markers 172 and 229. Interstate 70 between mile markers 106 and 154. Interstate 74 between mile markers 187 and 220.
INSTRUCTION: If outdoors, consider seeking shelter inside a building.
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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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