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 are Wall Clouds?
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A wall cloud forms underneath the base of a cumulonimbus cloud,
and can be a hotbed for deadly tornadoes.
Wall clouds are formed by air flowing into the cumulonimbus clouds, which can
result in the wall cloud descending from the base of the cumulonimbus cloud, or
rising fractus clouds which join to the base of the storm cloud as the wall cloud
takes shape.
Wall clouds can be very large, and in the Northern Hemisphere they generally
form at the southern edge of cumulonimbus clouds.
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Weather Topic: What are Altostratus Clouds?
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Next Topic: Cirrocumulus Clouds
Altostratus clouds form at mid to high-level altitudes
(between 2 and 7 km) and are created by a warm, stable air mass which causes
water vapor
to condense as it rise through the atmosphere. Usually altostratus clouds are
featureless sheets characterized by a uniform color.
In some cases, wind punching through the cloud formation may give it a waved
appearance, called altostratus undulatus. Altostratus clouds
are commonly seen with other cloud formations accompanying them.
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