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High Country Observer
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National
Weather Service Riverton, WY
Volume 7 Issue
2, December 2003 |
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Are you ready for Winter
2003-2004? In an average winter season, more than two dozen winter storms
occur within Wyoming. For the safety of yourself and family, it is important
to understand specific terms that the National Weather Service uses to warn
the public of impending hazards. Keep these weather terms in mind the next
time winter weather threatens. |
Winter Storm Watch |
Severe winter weather may impact your area within 48 hours.
You still have time to prepare!!! |
Winter Storm Warning |
Severe winter
weather is occurring or is imminent. Your should already be prepared and
should take protective actions immediately!!!
Issued
when the following snow amounts are expected (often
accompanied by blowing/drifting snow):
* Lower elevations (below 7500 ft): 6 inches or
more in 24 hours or an event
* Mountain locations (above 7500 ft):
12 inches or more in 24 hours or an event
Travel
can become difficult or impossible, especially for vehicles without four
wheel drive. |
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 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, freezing drizzle, and freezing rain. |
Wind Chill Warning |
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!!! |
High Wind Warning |
Hazardous winds are occurring or will soon occur across a
significant area.
Issued when wind
speeds and/or wind gusts reach the following criteria across
* Lower elevations (below
7500 ft): sustained winds of 40 mph or greater or gusts to 60 mph or
more.
* Mountain locations
(above 7500 ft): sustained winds of 50 mph or greater or gusts to at
least 75 mph. |
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