Special Weather Statement
Issued by NWS Riverton, WY

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Special Weather Statement
National Weather Service Riverton WY
120 PM MDT Tue Mar 21 2017

...A sharp change to colder conditions with rain possibly changing
to snow Wednesday night into Thursday for much of the area above
5000 to 6000 feet...

WYZ016>018-221215-
Upper Wind River Basin-Wind River Basin-Lander Foothills-
Including the cities of Dubois, Riverton, Shoshoni, and Lander
120 PM MDT Tue Mar 21 2017

Showers will become likely Wednesday night and there is a decent
possibility that the rain will change over to snow Thursday
morning and possibly continue during the day Thursday. Some of the
lowest elevations of the Wind River Basin may remain rain or mixed
rain and snow while other areas off the basin floor receive
significant snowfall. Very preliminary snowfall amounts point to 3
to 5 inches around the Lander Foothills and Upper Wind River Basin
Foothills with a skiff to 3 inches across most the Wind River
Basin. The storm will head off to the east Thursday night with
improving conditions by late Thursday night. Stay tuned for
further updates and adjustments as the storm draws closer
Wednesday.

$$

WYZ014-015-221215-
Wind River Mountains West-Wind River Mountains East-
120 PM MDT Tue Mar 21 2017

Rain and higher mountain snow in the Wind Rivers will turn to all
snow Wednesday night and continue through Thursday afternoon
before diminishing and ending later Thursday night. Preliminary
snowfall predictions point to 5 to 10 inches across the Wind River
Mountains Wednesday night and Thursday. South Pass will likely
become slick and snow covered by early Thursday. A few
thunderstorms are possible on Wednesday afternoon and early
evening.

$$

WYZ019-221215-
Green Mountains and Rattlesnake Range-
Including the city of Jeffrey City
120 PM MDT Tue Mar 21 2017

Widespread rain showers will develop Wednesday evening and change
to snow or rain and snow mixed by Thursday morning, especially
from near Jeffrey City westward. Early indications point to
snowfall amounts of 2 to 4 inches with up to 6 inches around
Beaver Rim.

$$

WYZ020-022-221215-
Natrona County Lower Elevations-Casper Mountain-
Including the city of Casper
120 PM MDT Tue Mar 21 2017

A developing storm system moving into the Great Basin Wednesday
will aid in a good chance of showers and isolated thunderstorms
Wednesday night with showers continuing Thursday. The higher
parts of Casper Mountain may change to snow on Thursday. As colder
air moves in Thursday evening the Casper area will likely change
over to snow with an inch or two possible Thursday night. Casper
Mountain may see as much as 3 to 6 inches. Stay tuned for further
updates as this storm draws closer Wednesday.

$$

WYZ008-009-221215-
Bighorn Mountains West-Bighorn Mountains Southeast-
120 PM MDT Tue Mar 21 2017

Snow is expected to develop across the Big Horn Mountains
Wednesday night and continue Thursday. Preliminary snowfall
amounts of 3 to 8 inches are expected across the area by Thursday
evening. Stay tuned for further updates as this storm draws
closer Wednesday. Travel over the mountains will likely become
slick and snow covered Wednesday night.

$$

WYZ010-011-221215-
Northeast Johnson County-Southeast Johnson County-
Including the cities of Buffalo and Kaycee
120 PM MDT Tue Mar 21 2017

The cold front entrenched over the area is expected to lift north
tomorrow for a much warmer day. However, this will be short lived
as a new storm system will move into the Great Basin Wednesday and
spread showers northward Wednesday night. A good chance of rain
will continue through Thursday with snow in the foothills. The
lower elevations will likely change to snow for a few hours by
Thursday evening with light accumulation of a skiff to an inch or
two possible. Stay tuned for further updates as this storm draws
closer Wednesday.

$$

WYZ002-003-007-221215-
Absaroka Mountains-Cody Foothills-Owl Creek and Bridger Mountains-
Including the cities of Cody and Meeteetse
120 PM MDT Tue Mar 21 2017

An approaching storm system will bring widespread showers to the
area Wednesday night with mountain snow and the possibility of
rain changing to snow across the lower elevations, especially
above 5000 to 6000 feet. The highest probability for the snow
besides the mountainous locations will be the area from Meeteetse
area south to Grass Creek Divide. The southern part of the
Absarokas may see 3 to 6 inches with local amounts to 8 inches.
The Cody Foothills could see 1 to 4 inches on Thursday into
Thursday evening. Stay tuned for further updates as this storm
draws closer Wednesday.

$$

WYZ024>026-221215-
Salt River and Wyoming Ranges-Upper Green River Basin Foothills-
Upper Green River Basin-
Including the cities of Pinedale, La Barge, Big Piney, and Farson
120 PM MDT Tue Mar 21 2017

Widespread showers and isolated thunderstorm will move into the
area Wednesday afternoon and evening with showers changing to snow
overnight across the lower elevations and continuing in the
southwest mountains. The snow will continue across most of the
area during the day Thursday before ending. Preliminary snowfall
amounts point to 3 to 6 inches in the mountains with local 8 inch
amounts with 1 to 4 inches across the Upper Green River Basin. The
northwest part of the basin will see the higher amounts. Stay tuned
for further updates as this storm draws closer Wednesday.

$$

WYZ001-012-013-023-221215-
Yellowstone National Park-Teton and Gros Ventre Mountains-
Jackson Hole-Star Valley-
Including the cities of Lake, Mammoth, Old Faithful, Jackson,
Afton, Alpine, Star Valley Ranch, and Thayne
120 PM MDT Tue Mar 21 2017

A new storm system will bring an increasing chance of mountain
snow to the area Wednesday night and Thursday with some rain
changing to snow in the lower elevations. Early indications point
to 2 to 6 inches in the mountains with an inch or two in the Star
and Jackson Valleys. Stay tuned for further updates as this storm
draws closer Wednesday. Isolated thunderstorms are also possible
Wednesday afternoon and early evening.

$$

WYZ027>030-221215-
South Lincoln County-Rock Springs and Green River-Flaming Gorge-
East Sweetwater County-
Including the cities of Kemmerer, Cokeville, Rock Springs,
Green River, and Wamsutter
120 PM MDT Tue Mar 21 2017

A new storm system will bring a mixed bag of weather across
Southern Lincoln and Sweetwater County Wednesday through Thursday.
Showers and isolated afternoon thunderstorms are expected to
develop Wednesday and continue at times through Thursday.
Temperatures are a challenge so there could be periods of rain
and snow Wednesday night and Thursday with all snow as the system
exists Thursday evening. Snowfall accumulation if any looks to be
quite light with only a skiff to an inch generally possible for
the lower elevations with some of the higher terrain and mountains
seeing a couple inches. Stay tuned for further updates as this
storm draws closer Wednesday.

$$

Skrbac



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