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Winter Weather Safety
Each year, as many as two dozen major snow storms occur between Wyoming's
borders, bringing heavy snow to parts of the state. But snow is only one of the
dangers that affect the state each winter. Gale force winds and sub freezing
temperatures can also wreak havoc at almost any time between October and April.
While relatively few people are directly
killed by severe winter storms, and untold higher number of fatalities can often be
indirectly attributed to winter weather. Some examples of the indirect dangers of winter
are:
Generations of hardy people have survived Wyoming's winters, and
generations more will in the years to come. Learning about the dangers that come with each
winter, and how to prepare for them, will help you to join that group.
Winter Weather Terminology
The National Weather Service uses specific terminology to describe
winter weather events. Understanding the definitions is important, so that you
know what to do during different circumstances. Remember these terms, because
the next time you hear them, your life and the lives of others may depend upon
it!
Winter Storm Watch - severe winter
weather may affect your area within 48 hours. You still have time to prepare.
Blizzard Warning - the most
dangerous of all winter weather is occurring or imminent: If you are caught outdoors or
on the road, you could lose your life! A blizzard is defined as a combination of winds
35 mph or greater with snow or blowing snow reducing visibility to less than 1/4 mile for
three or more hours. In blizzards, white-out conditions, deep snow drifts, and frigid wind
chills form a life-threatening partnership. You should seek refuge immediately!
Winter Storm Warning - severe
winter weather is occurring or imminent. You should already be
prepared and should take protective actions immediately.
- issued
when the following amounts of snow are expected:
- At lower elevations (below 7500 feet) - 6 inches or more in 24 hours or an event.
- In the mountains (above 7500 feet) - 12 inches or more in 24 hours or an event.
Travel can become difficult or impossible, especially for vehicles without four-wheel
drive.
High Wind Warning - hazardous
winds are occurring or will soon occur across a significant area.
- For elevations below 7500 feet - sustained winds of 40 mph or greater or gusts to 60 mph
or more.
- In higher elevations - sustained winds of 50 mph or greater or gusts to at least 75 mph.
- Travel can be downright dangerous, especially for high profile vehicles like semi
trucks, buses, and vans.
Wind Chill Warning
- Wind Chill Chart / What is the wind chill factor?
- wind chill is the combined effect of cold temperatures and wind in
chilling the body. A Warning is issued when wind chills of minus 40 degrees F or colder,
with winds of at least 10 mph, are occurring or imminent. Frostbite can occur in seconds,
and hypothermia within minutes!
Winter Weather Advisory - weather
conditions are expected to cause significant inconveniences and may be hazardous,
especially to motorists. If caution is exercised, however, these situations should not
become life threatening. Examples of conditions for which advisories are issued include
snow, blowing snow, frost, freezing drizzle, and dangerous wind chill.
- issued
when the following amounts of snow are expected:
- At lower elevations (below 7500 feet) - 3-6 inches in 24 hours or an event.
- In the mountains (above 7500 feet) - 5-12 inches in 24 hours or an event.
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Warnings, Watches, Advisories, & Statements
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