Weather Alert in Montana
Winter Weather Advisory issued February 22 at 8:21PM MST until February 24 at 5:00AM MST by NWS Missoula MT
AREAS AFFECTED: West Glacier 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. Confidence is highest for accumulating snow across Lincoln County valley areas. 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. Total snow accumulations of 1 to 4 inches in the valleys and 6 to 9 inches from Essex to Marias Pass. Higher amounts are expected in the higher terrain. Winds gusting as high as 35 mph. * WHERE...Highway 83 Bigfork to Swan Lake, Essex, Glacier National Park, Marias Pass, Polebridge, and Bad Rock Canyon. * WHEN...From 5 AM Monday to 5 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.
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 is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
Weather Topic: What is Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
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