Weather Alert in Montana
Winter Weather Advisory issued February 17 at 1:49PM MST until February 19 at 8:00AM MST by NWS Missoula MT
AREAS AFFECTED: West Glacier Region
DESCRIPTION: * WHAT...Snow and cold temperatures. There is a likelihood of ongoing minor winter weather impacts. Additional snow accumulations between 1 and 3 inches. * WHERE...Bad Rock Canyon, Glacier National Park, Marias Pass, Essex, Polebridge, and Highway 83 Bigfork to Swan Lake. * WHEN...Until 8 AM MST Thursday. * IMPACTS...Winter traveling conditions. For MINOR winter weather impacts, expect a few inconveniences to normal activities. MODERATE winter weather impacts, expect disruptions to normal activities.Use caution while driving. The hazardous conditions could impact the Tuesday evening and Wednesday morning commutes, especially over higher passes. * ADDITIONAL DETAILS...Northeast winds between 15 and 25 mph with gusts to 35 mph starting Tuesday night will generate bitterly cold wind chill temperatures as cold as 30 below zero. Any exposed skin could become frostbitten within 30 minutes in these conditions. Newborn livestock may be stressed. While northeast winds will lessen somewhat Wednesday night, wind chill temperatures near 20 below zero are possible.
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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