Weather Alert in Illinois

Recent Locations: Georgetown, KY   Hendersonville, NC   Chicago, IL  

Severe Thunderstorm Warning issued July 11 at 7:18PM CDT until July 11 at 8:00PM CDT by NWS Quad Cities IA IL

AREAS AFFECTED: Henderson, IL; Warren, IL; Des Moines, IA; Lee, IA

DESCRIPTION: At 718 PM CDT, severe thunderstorms were located along a line extending from near Bald Bluff to Gladstone to near Sawyer, moving east at 40 mph. HAZARD...60 mph wind gusts and quarter size hail. SOURCE...Radar indicated. IMPACT...Hail damage to vehicles is expected. Expect wind damage to roofs, siding, and trees. Locations impacted include... Burlington, Fort Madison, Monmouth, West Burlington, Roseville, West Point, Dallas City, Donnellson, Stronghurst, Kirkwood, Middletown, Carman, Biggsville, Gladstone, Terre Haute, Franklin, Raritan, Gulf Port, Little Swan Lake, and Iowa Army Ammunition Plant.

INSTRUCTION: A Tornado Watch remains in effect until 800 PM CDT for west central Illinois...southeastern Iowa...and northeastern Missouri. Torrential rainfall is occurring with these storms, and may lead to flash flooding. Do not drive your vehicle through flooded roadways.

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Weather Topic: What are Cirrus Clouds?

Home - Education - Cloud Types - Cirrus Clouds

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

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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