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 Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
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