Weather Alert in Idaho
Avalanche Advisory issued February 21 at 5:55AM MST by NWS Pocatello ID
AREAS AFFECTED: Bear River Range
DESCRIPTION: SABPIH The following message is transmitted at the request of the Forest Service Utah Avalanche Center. The Forest Service Utah Avalanche Center has issued a SPECIAL AVALANCHE BULLETIN for the following areas: * WHAT...Dangerous avalanche conditions are possible across the Bear River Range and surrounding mountains across northern Utah this weekend. This week's heavy snowfall and strong winds overloaded preexisting weak layers, creating HIGH avalanche danger. With improving weather moving in for the weekend, avalanche accidents are likely in the backcountry. There have already been two avalanche fatalities this week, as well as several close calls and numerous backcountry avalanches reported. * WHERE...Bear River Range and surrounding mountains across northern Utah. * WHEN...6 AM MST Monday. * IMPACTS...Dangerous avalanche conditions exist in the mountains and will persist through the weekend.
INSTRUCTION: Natural avalanches are possible, and people are likely to trigger avalanches on slopes steeper than 30 degrees. Dangerous and deadly avalanches can be triggered remotely from a distance or from below. People leaving ski area boundaries are entering the backcountry where the same dangerous avalanche conditions exist. Consult www.utahavalanchecenter.org 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.
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Weather Topic: What is Snow?
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Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
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Weather Topic: What are Stratus Clouds?
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Next Topic: Wall Clouds
Stratus clouds are similar to altostratus clouds, but form at a
lower altitude and are identified by their fog-like appearance, lacking the
distinguishing features of most clouds.
Stratus clouds are wider than most clouds, and their base has a smooth, uniform
look which is lighter in color than a nimbostratus cloud.
The presence of a stratus cloud indicates the possibility of minor precipitation,
such as drizzle, but heavier precipitation does not typically arrive in the form
of a stratus cloud.
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