Weather Alert in Idaho
Avalanche Watch issued February 23 at 1:51PM MST by NWS Boise ID
AREAS AFFECTED: Adams, ID; Idaho, ID; Valley, ID
DESCRIPTION: The following message is transmitted at the request of the Payette National Forest Avalanche Center. ...The Payette National Forest Avalanche Center in McCall Idaho has issued a BACKCOUNTRY AVALANCHE WATCH... * WHAT...An Avalanche Watch is in effect. Expect very dangerous avalanche conditions to develop over the next 24-48 hours. Heavy snowfall, wind, and rainfall will overload the current snowpack setup. * WHERE...The Salmon River Mountains, the West Mountains, and the surrounding mountain areas. * WHEN...In effect from Mon 12:00 MST to Tue 12:00 MST. * IMPACTS...Natural and human-triggered avalanches large enough to bury people are very likely to occur within 24-48 hours of this issuance. Avalanches may connect across terrain features like ridges or release multiple start zones at once. Additionally, rainfall to 7,000 feet will weaken surface snow and increase the likelihood of larger loose avalanches, as well as avalanches that break deeper within the snowpack. Smaller slopes, such as roadcuts, may also avalanche, depositing a surprising amount of debris on the road below.
INSTRUCTION: Anticipate conditions that dictate staying off and out from below steep slopes - slopes steeper than about 30 degrees. Travel in avalanche terrain is not recommended per this upcoming timeframe. Natural and human-triggered avalanches may occur in unexpected or surprising ways, travel farther than anticipated, and impact gentler terrain below. Even small but steep terrain features, such as road cuts or rooftops holding old snow, may be hazardous. Consult WWW.PAYETTEAVALANCHE.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. LAT...LON 4539 11600 4520 11584 4513 11579 4455 11577 4455 11603 4439 11600 4427 11613 4440 11627 4479 11635 4497 11622 4527 11633 4535 11635 4539 11629
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Weather Topic: What are Altostratus Clouds?
Home - Education - Cloud Types - Altostratus Clouds
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.
Next Topic: Cirrocumulus Clouds
Weather Topic: What are Cirrostratus Clouds?
Home - Education - Cloud Types - Cirrostratus Clouds
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.
Next Topic: Cirrus Clouds
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