Weather Alert in Idaho
Avalanche Advisory issued March 22 at 6:51AM MDT 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...A Special Avalanche Advisory is issued for all mountain regions across Utah through Sunday, March 22, as avalanche danger is expected to rise in the coming days. * WHERE...The mountains of Utah and southeastern Idaho. * WHEN...In effect until 6 AM MDT Monday. * IMPACTS...Record-breaking warm temperatures will rapidly destabilize the snowpack across the state, increasing the likelihood of widespread, spontaneous, destructive wet avalanches. Wet avalanches could occur on all aspects and at all elevations, including places that typically stay colder this time of year. Avoid travel on and below steep slopes, including avalanche runout zones and terrain traps. 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.
INSTRUCTION: N/A
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Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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