Weather Alert in Montana

Recent Locations: Miami, FL   East Orleans, MA   Saint Marie, MT  

Winter Weather Advisory issued February 22 at 2:05PM MST until February 24 at 9:00AM MST by NWS Missoula MT

AREAS AFFECTED: Lower Clark Fork Region

DESCRIPTION: ...WINTRY MIX IN VALLEYS AND MOUNTAIN SNOW MONDAY THROUGH MONDAY NIGHT... .Snow levels will be borderline in northwest Montana valleys, and a wintry mix brings an increased risk for slick conditions during the Monday morning commute. Over mountain passes, snow will begin overnight with minor impacts, intensifying by Monday afternoon. Expect moderate travel impacts with slushy accumulation on I-90 and US-2 through Monday night. * WHAT...Snow expected. There is a likelihood of minor to moderate winter weather impacts over Lookout Pass and in the high terrain. Total snow accumulations 4 to 8 inches from Taft to Lookout Pass. * WHERE...Evaro Hill, Highway 200 Thompson Falls to Plains, I-90 Lookout Pass to Haugan, and Highway 200 Trout Creek to Heron. * WHEN...From 1 PM Monday to 9 AM MST Tuesday. * IMPACTS...For MODERATE winter weather impacts, expect disruptions to normal activities. Hazardous traveling conditions. Use extra caution while driving. Closures and disruptions to infrastructure may occur. The hazardous conditions could impact the Monday evening and Tuesday morning commutes, especially over higher passes. * ADDITIONAL DETAILS...Light pass level snow and a wintry mix in valleys may cause minor travel impacts Monday morning, but main travel impacts for Lookout Pass are expected to begin Monday afternoon.

INSTRUCTION: Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.

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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

Weather Topic: What are Cumulus Clouds?

Home - Education - Cloud Types - Cumulus Clouds

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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