Weather Alert in Idaho
Avalanche Advisory issued February 20 at 5:27AM MST 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...DANGEROUS AVALANCHE CONDITIONS ARE POSSIBLE ACROSS THE BEAR RIVER RANGE AND SURROUNDING MOUNTAINS OF NORTHERN UTAH THIS WEEKEND. THIS WEEK'S HEAVY SNOWFALL AND STRONG WINDS OVERLOADED PREEXISTING WEAK LAYERS, CREATING A HIGH AVALANCHE DANGER. WITH IMPROVING WEATHER MOVING IN FOR THE WEEKEND, AVALANCHE ACCIDENTS ARE LIKELY IN THE BACKCOUNTRY. THERE HAVE ALREADY BEEN TWO AVALANCHE FATALITIES THIS WEEK, AS WELL AS SEVERAL CLOSE CALLS AND NUMEROUS BACKCOUNTRY AVALANCHES REPORTED. * WHERE...BEAR RIVER RANGE AND SURROUNDING MOUNTAINS OF NORTHERN UTAH. * WHEN...THROUGH 6 AM MST MONDAY. * IMPACTS...DANGEROUS AVALANCHE CONDITIONS EXIST IN THE AND WILL PERSIST THROUGH THE WEEKEND.
INSTRUCTION: NATURAL AVALANCHES ARE POSSIBLE, AND PEOPLE ARE LIKELY TO TRIGGER AVALANCHES ON SLOPES STEEPER THAN 30 DEGREES. DANGEROUS AND DEADLY AVALANCHES CAN BE TRIGGERED REMOTELY FROM A DISTANCE OR FROM BELOW. PEOPLE LEAVING SKI AREA BOUNDARIES ARE ENTERING THE BACKCOUNTRY WHERE THE SAME DANGEROUS AVALANCHE CONDITIONS EXIST. 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 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
Weather Topic: What is Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
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