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 Cumulonimbus Clouds?
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Next Topic: Cumulus Clouds
The final form taken by a growing cumulus cloud is the
cumulonimbus cloud, which is very tall and dense.
The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although
most commonly they stop growing at an altitude of 6 km.
Even small cumulonimbus clouds appear very large in comparison to other cloud types.
They can signal the approach of stormy weather, such as thunderstorms or blizzards.
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Weather Topic: What is Drizzle?
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Next Topic: Evaporation
Drizzle is precipitation in the form of water droplets which are
smaller than raindrops.
Drizzle is characterized by fine, gently falling droplets and typically does not
impact human habitation in a negative way. The exception to this is freezing drizzle,
a condition where drizzle freezes immediately upon reaching earth's surface.
Freezing drizzle is still less dangerous than freezing rain, but can
potentially result in hazardous road conditions.
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