Special Weather Statement
Issued by NWS Riverton, WY

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WWUS85 KRIW 210407
SPSRIW

Special Weather Statement
National Weather Service Riverton WY
1007 PM MDT Thu Apr 20 2017

WYZ001-012-014-024-211000-
Yellowstone National Park-Teton and Gros Ventre Mountains-
Wind River Mountains West-Salt River and Wyoming Ranges-
Including the cities of Lake, Mammoth, and Old Faithful
1007 PM MDT Thu Apr 20 2017

Scattered to numerous snow showers ongoing across the western
mountains and Yellowstone National Park will gradually decrease in
coverage and intensity after midnight. Additional snowfall amounts
of 1 to 4 inches can be expected.

$$

WYZ016-211000-
Upper Wind River Basin-
Including the city of Dubois
1007 PM MDT Thu Apr 20 2017

Areas of rain and snow between Crowheart to Dubois will change to
all snow during the predawn hours Friday. Scattered snow showers
are then expected to continue during the day Friday. The heaviest
precipitation is expected through about sunrise. 1 to 3 inches of
snowfall could occur especially on elevated or grassy areas.

$$

WYZ017-018-211000-
Wind River Basin-Lander Foothills-
Including the cities of Riverton, Shoshoni, and Lander
1007 PM MDT Thu Apr 20 2017

Areas of rain will gradually become widespread across the Wind
River Basin after midnight. The rain is then expected to change to
snow in most locations between 6 AM and 9 AM especially above 5000
feet. Scattered to numerous mainly snow showers are expected to
continue through the day Friday. 1 to 3 inches of snow could
accumulate especially on grassy areas. Heavier amounts of snow
could occur where snow bands persist, but pinpointing these
locations are difficult at this time. Roads could become slick and
hazardous during heavier bursts of heavy snow, but roads are
currently expected to be mainly wet.

$$

WYZ019-211000-
Green Mountains and Rattlesnake Range-
Including the city of Jeffrey City
1007 PM MDT Thu Apr 20 2017

Areas of rain will gradually become widespread across the higher
elevations of southeast Fremont County after midnight. The rain
is then expected to change to snow during the predawn hours. Scattered
to numerous snow showers are expected to continue through the day
Friday. 1 to 4 inches of snow could accumulate especially on
grassy areas. Heavier amounts of snow could occur where snow bands
persist, but pinpointing these locations are difficult at this
time. Highways especially over Beaver Rim will likely become
slick and hazardous during heavier bursts of heavy snow.

$$

WYZ005-211000-
Southwest Big Horn Basin-
Including the city of Thermopolis
1007 PM MDT Thu Apr 20 2017

Areas of rain will gradually become widespread across Hot Springs
County after midnight. The rain is then expected to change to
snow in most locations between 6 AM and 9 AM. Periods of snow
are expected to continue through the day Friday. 2 to 3 inches of
snow could accumulate especially on grassy areas. Heavier amounts
of snow could occur in the Hamilton Dome and south of Thermopolis
near the mouth of the Wind River Canyon. Roads especially highway
120 northwest of Thermopolis will probably become slick and
hazardous at times, while highway 20, 789 north of Thermopolis
will likely just be wet.

$$

WYZ022-211000-
Casper Mountain-
1007 PM MDT Thu Apr 20 2017

Scattered rain and snow showers tonight, will become all snow
Friday morning. Scattered snow showers will then continue through
the day Friday, and come to an end Friday evening. 2 to 5 inches
with isolated higher amounts are expected over Casper and Muddy
mountains. Roads over Casper Mountain could become slick and
hazardous at times.

$$

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