Special Weather Statement
Issued by NWS Riverton, WY

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WWUS85 KRIW 160719
SPSRIW

Special Weather Statement
National Weather Service Riverton WY
119 AM MDT Tue May 16 2017

...Another strong spring storm is expected to hit much of Western
and Central Wyoming during the latter half of this week with
significant precipitation and mountain snow...

WYZ001-012-013-162200-
Yellowstone National Park-Teton and Gros Ventre Mountains-
Jackson Hole-
Including the cities of Lake, Mammoth, Old Faithful, and Jackson
119 AM MDT Tue May 16 2017

Another potent spring storm will likely hit much of Northwest
Wyoming tonight and Wednesday. A strong cold front will push
through the area Tuesday night with the Tetons initially
experiencing the colder weather and increasing snowfall, then
quickly spreading northeast to the Jackson Valley, Gros Ventre
Range, and then finally to Yellowstone Park.

The significant snowfall should persist into Wednesday. Snowfall
during this time frame could potentially add up to a few inches in
the Jackson Valley and lower elevations of Yellowstone Park along
with much more significant snowfall above 7500 feet across the
mountains. Another couple of inches of snowfall could occur
Wednesday night.

As much as one half to one and a half inches of precipitation
could fall over some of these areas during this weather event.

Stay tuned for additional statements concerning this weather event.

$$

WYZ014-023>025-027-162200-
Wind River Mountains West-Star Valley-
Salt River and Wyoming Ranges-Upper Green River Basin Foothills-
South Lincoln County-
Including the cities of Afton, Alpine, Star Valley Ranch, Thayne,
Pinedale, Kemmerer, and Cokeville
119 AM MDT Tue May 16 2017

Another potent spring storm will likely hit much of far Southwest
Wyoming tonight and Wednesday. Rapidly falling temperatures
Tuesday night in response to a sharp cold frontal passage could
deliver several inches of snowfall to the Salt River Range,
Wyoming Range, and the West Slope of the Wind River Mountains.

A quick couple of inches of snowfall should occur in the Star
Valley and portions of Southern Lincoln County in just a few hours
Tuesday night. Road conditions could potentially deteriorate
quickly, becoming slick and snow covered in a short period of time
Tuesday night. Another couple of inches of snow could fall on
Wednesday.

As much as one half to one and a half inches of precipitation
could fall over some of these areas during this weather event.

Stay tuned for additional statements concerning this weather event.

$$

WYZ003-162200-
Cody Foothills-
Including the cities of Cody and Meeteetse
119 AM MDT Tue May 16 2017

Another strong spring weather system has the potential to deliver
some accumulating snowfall across the Cody Foothills. Some
snowfall could persist through Thursday. The temperature may be
cold enough for the rain to turn to snowfall Wednesday night in
the Cody Foothills including Cody, Meeteetse, and Clark where a
couple of inches of snowfall could occur.

As much as one half to one and a half inches of precipitation
could fall over some of these during this weather event.

Stay tuned for additional statements concerning this weather event.

$$

WYZ007-010-011-015>020-022-162200-
Owl Creek and Bridger Mountains-Northeast Johnson County-
Southeast Johnson County-Wind River Mountains East-
Upper Wind River Basin-Wind River Basin-Lander Foothills-
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-Casper Mountain-
Including the cities of Buffalo, Kaycee, Dubois, Riverton,
Shoshoni, Lander, Jeffrey City, and Casper
119 AM MDT Tue May 16 2017

Another spring storm has the potential to deliver significant
precipitation this week along with accumulating mountain snow.
Initially, the cold front could deliver some accumulating snow
to the East Slope of the Wind River Mountains tonight. This will
likely be followed by a respite in the precipitation Wednesday and
Wednesday night as drier air moves in from the south. Then
additional moisture will wrap around the back side of the low
pressure system for more precipitation on Thursday. More
significant snowfall could occur on Thursday and Thursday night
across the East Slope of the Wind River Mountains.

On Thursday and Thursday night, significant accumulating snow
will also fall over Casper Mountain and the Owl Creek Mountains as
well. In addition, by Thursday, the temperature could actually
become cold enough for the rain to turn to snowfall across the
lower elevations of Johnson, Natrona, and Fremont Counties on
Thursday and Thursday night including the cities of Buffalo,
Casper, Riverton, and Lander. High elevation highways such as
Highway 28 over South Pass and Casper Mountain Road could become
slick and snow covered.

As much as one half to one and a half inches of precipitation
could fall over some of these during this weather event.

Stay tuned for additional statements concerning this weather event.

$$



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