Weather Alert in Montana
Avalanche Warning issued February 24 at 5:21AM MST by NWS Billings MT
AREAS AFFECTED: Absaroka/Beartooth Mountains
DESCRIPTION: AVWBYZ The following message is transmitted at the request of the Gallatin National Forest Avalanche Center. The Gallatin NF Avalanche Center in Bozeman has issued a BACKCOUNTRY AVALANCHE WARNING for the following areas: NWS Billings MT - MTZ067 (MTZ067) * WHAT...The Gallatin National Forest Avalanche Center has issued an AVALANCHE WARNING for the Cooke City area. Heavy snowfall and strong winds are rapidly loading weak layers in the snowpack, creating very dangerous avalanche conditions. Human-triggered and natural avalanches are likely. Avoid travel on and underneath slopes steeper than 30 degrees. The avalanche danger is HIGH on all slopes. * WHERE...The mountains in and around Cooke City. * WHEN...In effect from Tue 05:00 MST to Wed 05:00 MST. * IMPACTS...Heavy snowfall and strong winds are creating unstable conditions over wide areas. * PRECAUTIONARY / PREPAREDNESS ACTIONS...Very dangerous avalanche conditions. Backcountry travelers should stay off and out from under slopes steeper than 30 degrees. Avalanches can be triggered from flat terrain above, below, and to the side of steep slopes. Avalanches will run into lower-angled terrain. Consult http://www.mtavalanche.com or www.avalanche.org for more detailed information. Similar avalanche danger may exist at locations outside the coverage area of this or any avalanche center.
INSTRUCTION: N/A
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Weather Topic: What is Rain?
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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.
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Weather Topic: What is Sleet?
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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.
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