Weather Alert in Wyoming

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Air Quality Alert issued February 9 at 4:33AM MST by NWS Rapid City SD

AREAS AFFECTED: Southern Campbell

DESCRIPTION: The following message is transmitted in collaboration with the Wyoming Department of Environmental Quality, Air Quality Division. * WHAT...Northwest winds of 25 to 35 mph with gusts up to 50 mph. * WHERE...Powder River Basin of northeastern Wyoming. * WHEN...9 AM this morning to 3 PM this afternoon. * IMPACTS...The strong winds will create blowing dust.

INSTRUCTION: The Wyoming Air Quality Division recommends the elderly, young children, and individuals with respiratory problems avoid excessive physical exertion and minimize outdoor activities during this time. Although these people are most susceptible to health impacts, the air quality division also advises that everyone should avoid prolonged exposure to the poor air quality conditions.

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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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