Weather Alert in Montana
Avalanche Watch issued February 22 at 6:19PM MST by NWS Missoula MT
AREAS AFFECTED: West Glacier Region
DESCRIPTION: AVAMSO The following message is transmitted at the request of the Flathead Avalanche Center Hungry Horse MT ...The Flathead Avalanche Center Hungry Horse MT has issued a Backcountry Avalanche Watch... * WHAT...An incoming storm may create exceptionally dangerous conditions. * WHERE...Flathead Range, Whitefish Range, Swan Range, and Apgar Ranges, and the Lake McDonald Valley and Marias Pass regions in Glacier National Park. * WHEN...In effect until 12 PM MST Monday * IMPACTS...If snow and strong winds arrive Monday as forecast, avalanche danger may rise to High (Level 4 of 5). New and drifted snow will overload a snowpack already producing large and very large avalanches. Many slides are being triggered from long distances away in lower-angle terrain below, near, and above steep slopes. The likelihood of natural and human- triggered avalanches will increase.
INSTRUCTION: Exceptionally dangerous avalanche conditions may develop. Travel in avalanche terrain is not recommended. Avalanches may run long distances and can run into mature forests, valley floors, or flat terrain. Consult http://www.flatheadavalanche.org for more detailed information. Similar avalanche danger may exist at locations outside the coverage area of any Avalanche Center.
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Weather Topic: What are Hole Punch Clouds?
Home - Education - Cloud Types - Hole Punch Clouds
Next Topic: Mammatus Clouds
A hole punch cloud is an unusual occurrence when a disk-shaped
hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.
When part of the cloud forms ice crystals, water droplets in the surrounding area
of the cloud evaporate. The effect of this process produces a large elliptical
gap in the cloud. The hole punch cloud formation is rare, but it is not specific
to any geographic area.
Other names which have been used to describe this phenomena include fallstreak hole,
skypunch, and cloud hole.
Next Topic: Mammatus Clouds
Weather Topic: What are Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
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