Weather Alert in Idaho

Recent Locations: Blackfoot, ID  

Winter Storm Warning issued March 12 at 5:09AM MDT until March 14 at 12:00PM MDT by NWS Missoula MT

AREAS AFFECTED: Northern Clearwater Mountains

DESCRIPTION: * WHAT...Heavy snow expected. There is a likelihood of extreme winter storm impacts. Total snow accumulations 2 to 8 inches in the lower elevations and 20 to 50 inches in the higher terrain. Winds gusting as high as 50 mph Thursday morning, then up to 35 mph thereafter. * WHERE...Elk River, Highway 11 Pierce to Headquarters, and Pierce. * WHEN...Until 11 AM PDT Saturday. * IMPACTS...For EXTREME winter storm impacts, expect substantial disruptions to normal activities. Extremely dangerous or impossible traveling conditions in the higher terrain and backcountry. Travel in the impacted areas is not advised. Life saving actions may be needed. The hazardous conditions could impact the Thursday morning commutes, especially over higher passes. Gusty winds could bring down tree branches.

INSTRUCTION: Persons should delay all travel if possible. If travel is absolutely necessary, drive with extreme caution and be prepared for sudden changes in visibility. Leave plenty of room between you and the motorist ahead of you, and allow extra time to reach your destination. Avoid sudden braking or acceleration, and be especially cautious on hills or when making turns. Make sure your car is winterized and in good working order. Do not touch downed lines and report any power outages to your electric company. Travel is highly discouraged due to slick roadways and the possibility of downed trees and power lines.

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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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