Special Weather Statement
Issued by NWS Riverton, WY

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WWUS85 KRIW 130747
SPSRIW

Special Weather Statement
National Weather Service Riverton WY
147 AM MDT Wed Sep 13 2017

WYZ001-002-012>015-023>027-132215-
Yellowstone National Park-Absaroka Mountains-
Teton and Gros Ventre Mountains-Jackson Hole-
Wind River Mountains West-Wind River Mountains East-Star Valley-
Salt River and Wyoming Ranges-Upper Green River Basin Foothills-
Upper Green River Basin-South Lincoln County-
Including the cities of Lake, Mammoth, Old Faithful, Jackson,
Afton, Alpine, Star Valley Ranch, Thayne, Pinedale, La Barge,
Big Piney, Farson, Kemmerer, and Cokeville
147 AM MDT Wed Sep 13 2017

...Major Change To Cold and Wet Conditions Thursday Night Through
Saturday...

...Significant Mountain Snow Possible Friday into Saturday...

A storm system will move across the area from Thursday through
Saturday. Widespread showers and some thunderstorms are expected
ahead of this system Thursday into Thursday night. Colder air will
move in later Thursday night along with lowering snow levels.
Rain will continue across the lower elevations while snow levels
fall from above 10,000 feet Thursday night to near the valley
floors Friday night. Significant mountain snow is expected over
most of the northern mountains later Friday into Friday night.
It`s quite possible that the mountains several inches of snow with
over a foot above 10,000 feet during this period. Even the
Jackson Valley and Upper Green River Basin Foothills could see a
dusting of snow later Friday night.

Campers, hunters and other outdoor interests should keep abreast
of the latest developments on this first cold storm system of the
pre-fall season. Some of the higher trails in the mountains could
be covered by a significant amount of snow later Friday into
Saturday. Pay attention to the latest forecast and plan
accordingly.

Freezing temperatures will likely impact much of the western
valleys and basins Sunday morning behind this system.

Stay tuned for further statements from your National Weather
Service office in Riverton.


$$

WYZ003>011-016>020-022-028>030-132215-
Cody Foothills-North Big Horn Basin-Southwest Big Horn Basin-
Southeast Big Horn Basin-Owl Creek and Bridger Mountains-
Bighorn Mountains West-Bighorn Mountains Southeast-
Northeast Johnson County-Southeast Johnson County-
Upper Wind River Basin-Wind River Basin-Lander Foothills-
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-Casper Mountain-
Rock Springs and Green River-Flaming Gorge-East Sweetwater County-
Including the cities of Cody, Meeteetse, Thermopolis, Worland,
Buffalo, Kaycee, Dubois, Riverton, Shoshoni, Lander,
Jeffrey City, Casper, Rock Springs, Green River, and Wamsutter
147 AM MDT Wed Sep 13 2017

...Major Change To Colder and Wet Conditions Thursday Night
Through Saturday...

...Significant Mountain Snow Possible Friday into Saturday...

A storm system will move across the area from Thursday afternoon
through Saturday. Widespread showers and some thunderstorms are
expected ahead of this system Thursday into Thursday night. Only
the highest peaks will see snow from the first part of this storm.
However, as a strong cold front moves in late Thursday night,
much colder air will be ushered in along with falling snow levels.
Widespread rain will continue across the lower elevations while
snow levels fall from above 10,000 feet Thursday night lowering to
between 6000 and 7000 feet Friday night and Saturday morning.
Significant snow is expected over Bighorn mountains later Friday
through Saturday as much colder air moves in and snow levels
lower. It`s quite possible that the Big Horn mountains see 4 to 8
inches of snow with over a foot above 10,000 feet during this
period. The lower elevations will see periods of rain during this
period, possibly mixing with or changing to snow above 6,000 to
7000 feet late Friday night or early Saturday.

Campers, hunters and other outdoor interests should keep abreast
of the latest developments on this first cold storm system of the
pre-fall season. Some of the higher trails in the Big Horn
mountains could be covered by a significant amount of snow later
Friday into Saturday. Pay attention to the latest forecast and
plan accordingly.

Freezing temperatures are also possible in the low lying areas Sunday
morning behind this system.

Stay tuned for further statements from your National Weather
Service office in Riverton.

$$

TEAM RIVERTON



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