Weather Alert in Iowa

Recent Locations: Pomfret, MD Weld, ME Deloit, IA

Dense Fog Advisory issued September 2 at 5:51AM CDT until September 2 at 11:00AM CDT by NWS Sioux Falls SD

AREAS AFFECTED: Plymouth; Cherokee; Buena Vista; Woodbury; Ida; Dixon; Dakota; Gregory; Brule; Aurora; Charles Mix; Douglas; Hutchinson; Turner; Lincoln; Bon Homme; Yankton; Clay; Union

DESCRIPTION: * WHAT...Visibility less than one mile in dense fog. * WHERE...Portions of northwest and west central Iowa, northeast Nebraska, and south central and southeast South Dakota. * WHEN...Until 11 AM CDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous.

INSTRUCTION: If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

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North America Water Vapor (Moisture)

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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