Weather Alert in Idaho
Avalanche Warning issued February 18 at 5:22AM MST by NWS Pocatello ID
AREAS AFFECTED: Bear River Range
DESCRIPTION: AVWPIH * WHAT...Avalanche warning. The avalanche danger is HIGH. * WHERE...The Bear River Range and other mountains ranges across northern Utah. * WHEN...Through 6 AM MST Thursday. * IMPACTS...Recent heavy snow combined with strong wind is creating widespread areas of unstable snow. Both human triggered and natural avalanches are likely. Avalanches will increase in size and likelihood throughout the day.
INSTRUCTION: Avoid all avalanche terrain. Stay off of and out from under slopes steeper than 30 degrees. Carry and know how to use avalanche equipment. Find safer riding conditions on slopes less than 30 degrees with no overhead hazard. 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 Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds
Weather Topic: What is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
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