Special Weather Statement
Issued by NWS Riverton, WY

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WWUS85 KRIW 170818
SPSRIW

Special Weather Statement
National Weather Service Riverton WY
218 AM MDT Tue Apr 17 2018

WYZ004>007-171830-
North Big Horn Basin-Southwest Big Horn Basin-
Southeast Big Horn Basin-Owl Creek and Bridger Mountains-
Including the cities of Thermopolis and Worland
218 AM MDT Tue Apr 17 2018

...Much Colder with some Snow Today...

A strong cold front has pushed south across the Big Horn Basin
early Tuesday morning. Rain and snow showers are expected to
break out between 4 AM and 8 AM, spreading quickly east and
southeast across the basin this morning. The rain is expected to
change to snow in most locations between 7 AM and 9 AM except
perhaps in locations below 4200 feet. The snowfall could briefly
be heavy at times with a quick 1 to 2 inches accumulating mainly
on grassy or elevated areas. Isolated higher snow amounts could
occur in the Nowood Valley, and in the Cody Foothills. Most of the
precipitation will exit the area by around Noon. Roads could
briefly become slick and hazardous this morning during bursts of
heavier snowfall.

$$

WYZ008-009-171830-
Bighorn Mountains West-Bighorn Mountains Southeast-
218 AM MDT Tue Apr 17 2018

...Much Colder with some Snow Today...

Snow is expected to develop over the Bighorn Mountains around
sunrise. Periods of snow are then expected to continue through at
least mid-afternoon. The heaviest snowfall should occur between 9
AM and 3 PM. Snowfall totals are expected to range between 3 and
5 inches with isolated locations seeing 6 to 8 inches. Granite and
Powder River passes will become slick and hazardous this morning,
but should improve by late afternoon.

$$

WYZ010-011-171830-
Northeast Johnson County-Southeast Johnson County-
Including the cities of Buffalo and Kaycee
218 AM MDT Tue Apr 17 2018

...Much Colder, Windy with some Snow Today...

A strong cold front will continue to push south across Johnson
County early this morning. Much colder temperatures will occur in
wake of this front with temperatures dropping into the 30s, and
remaining in the 30s for much of the day. Snow showers are
expected to impact Johnson County mainly between 9 AM and 3 PM.
The snow could begin as rain, but should change quickly to snow in
most locations. Snow accumulations of around 1 inch could occur
especially on grassy or elevated surfaces, but roads should remain
mainly wet except during brief bursts of heavy snowfall. Also a
very windy northwest to north wind of 25 to 35 mph with some gusts
of 45 to 55 mph will occur. Lightweight and high profile vehicles
should be especially cautious if traveling across Johnson County
today due to a slight risk of a blowover.

$$

WYZ015>019-171830-
Wind River Mountains East-Upper Wind River Basin-Wind River Basin-
Lander Foothills-Green Mountains and Rattlesnake Range-
Including the cities of Dubois, Riverton, Shoshoni, Lander,
and Jeffrey City
218 AM MDT Tue Apr 17 2018

...Much Colder with some Snow Today...

A cold front will sweep southeast across the Wind River Basin
this morning. Rain and snow showers are expected to develop by 6
AM over the northwest parts of the Wind River Basin, and then push
eastward across the basin this morning. The precipitation could
begin as rain, before transitioning to mainly snow by around 8 or
9 AM. 1 to 2 inches of snow could accumulate, generally above
5300 feet, on grassy or elevated surfaces. Roads are expected to
remain mainly wet, but could briefly become slick and hazardous
with any bursts of heavy snowfall. The heaviest snow is expected
to end by around noon, but snow showers will continue to impact
the Wind River Basin through the afternoon.

$$

WYZ014-025-026-171830-
Wind River Mountains West-Upper Green River Basin Foothills-
Upper Green River Basin-
Including the cities of Pinedale, La Barge, Big Piney, and Farson
218 AM MDT Tue Apr 17 2018

...Much Colder with some Snow This Morning...

Scattered snow showers are expected to impact the Upper Green
River Basin this morning. However accumulations are expected to be
an inch or less. Northwest winds between 20 and 30 mph with gusts
around 45 mph will also occur. This combined with temperatures in
the 30s will result in a blustery, chilly spring day.

$$

WYZ028>030-171830-
Rock Springs and Green River-Flaming Gorge-East Sweetwater County-
Including the cities of Rock Springs, Green River, and Wamsutter
218 AM MDT Tue Apr 17 2018

...Much Colder with some Snow Today...

A cold front will continue to sweep east across Sweetwater County
this morning. A period of 1 to 3 hours of snowfall, possibly
heavy at times, is expected along and behind the cold front this
morning. Most of the snow should exit Sweetwater County by noon. A
quick inch of snow could accumulate mainly on grassy or elevated
surfaces. However roads, including Interstate 80, could briefly
become slick during bursts of heavier snow. Visibility in the snow
could quickly lower to under a half mile. West winds of 25 to 35
mph with gusts of 45 to 55 mph are expected, making it a blustery,
chilly spring day. Also lightweight and high profile vehicles
should be especially cautious if traveling across Sweetwater
County today due to a slight risk of a blowover especially on
north to south oriented roadways.

$$

WYZ020-022-171830-
Natrona County Lower Elevations-Casper Mountain-
Including the city of Casper
218 AM MDT Tue Apr 17 2018

...Much Colder with some Snow Today...

A strong cold front will sweep across Natrona County later this
morning. This will result in temperatures dropping into the 30s
later this morning or early afternoon. Also some precipitation is
likely late this morning into the afternoon in wake of the strong
cold front. The precipitation could begin as rain, but should
change quickly to snow. There could also be a thunderstorm or two.
Minor snow accumulations could occur on grassy or elevated
surfaces, but roads are expected to be mainly wet.

$$

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