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 Altostratus Clouds?
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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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Weather Topic: What are Cirrostratus Clouds?
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Next Topic: Cirrus Clouds
Cirrostratus clouds are high, thin clouds that form above
20,000 feet and are made mostly of ice crystals. They sometimes look like giant
feathers, horse tails, or curls of hair in the sky.
These clouds are pushed by the jet stream and can move at high speeds reaching
100 mph.
What do they indicate?
They indicate that a precipitation is likely within 24 hours.
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