Winter Weather Warnings / Watches / Advisories
Issued by NWS Riverton, WY

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181
WWUS45 KRIW 271114
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
514 AM MDT Thu Apr 27 2017

...SIGNIFICANT SNOW OVER THE WEST ENDING THIS MORNING, BUT
SHIFTING TO NORTHERN AND CENTRAL WYOMING TODAY AND TONIGHT, AND
LASTING THROUGH FRIDAY EVENING...

.A cold spring storm will impact the Cowboy State through Friday
night with significant snowfall. The main impacts from this storm
system will shift from western Wyoming this morning, into
northern and central Wyoming later today and this evening as the
rain and snow changes to all snow, and becomes heavy at times. The
snow is gradually expected to taper off from north to south
Friday afternoon into Friday night.

WYZ009-272230-
/O.CON.KRIW.WS.W.0015.170427T1200Z-170429T0600Z/
Bighorn Mountains Southeast-
514 AM MDT Thu Apr 27 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT
FRIDAY NIGHT...

* TIMING...Snow will begin over the Bighorns this morning and
  continue, heavy at times into Friday evening.

* SNOW ACCUMULATION...12 to 18 inches.

* MAIN IMPACT...Slushy to snow packed roads will make travel
  difficult on Powder River and Granite Passes.

* OTHER IMPACTS...Heavy snow will reduce visibility below a
  quarter mile at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter storm warning means significant amounts of snow, and or
blowing snow are expected or occurring. This could make travel
very hazardous or impossible. If you must travel keep some food,
water, and an extra flashlight in your vehicle in case of an
emergency. Check the latest road conditions at wyoroad.info or by
dialing 5 1 1.

&&

$$

WYZ010-011-272230-
/O.CON.KRIW.WS.W.0015.170428T0000Z-170429T0600Z/
Northeast Johnson County-Southeast Johnson County-
Including the cities of Buffalo and Kaycee
514 AM MDT Thu Apr 27 2017

...WINTER STORM WARNING REMAINS IN EFFECT FROM 6 PM THIS EVENING
TO MIDNIGHT MDT FRIDAY NIGHT...

* TIMING...A mix of rain and snow will change to all snow this
  evening and continue through Friday.

* SNOW ACCUMULATION...5 to 9 inches, with the highest amounts in
  the foothills of the Bighorns.

* MAIN IMPACT...Roads are expected to become slushy to snow
  covered tonight. Travel could become difficult at times
  especially late tonight and Friday morning.

* OTHER IMPACTS...Heavy snow will reduce visibility below a
  quarter mile at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter storm warning means significant amounts of snow, and or
blowing snow are expected or occurring. This could make travel
very hazardous or impossible. If you must travel keep some food,
water, and an extra flashlight in your vehicle in case of an
emergency. Check the latest road conditions at wyoroad.info or by
dialing 5 1 1.

&&

$$

WYZ020-272230-
/O.CON.KRIW.WS.W.0015.170428T0000Z-170429T0600Z/
Natrona County Lower Elevations-
Including the city of Casper
514 AM MDT Thu Apr 27 2017

...WINTER STORM WARNING REMAINS IN EFFECT FROM 6 PM THIS EVENING
TO MIDNIGHT MDT FRIDAY NIGHT...

* TIMING...A mix of rain and snow will change to snow by this
  evening. Periods of snow will continue into Friday evening.

* SNOW ACCUMULATION...5 to 9 inches, with the highest amounts in
  northern Natrona County and lesser amounts toward Casper.

* MAIN IMPACT...Roads will likely become slushy to snow covered
  later tonight, and remain slick at times through Friday night.
  The worst driving conditions should occur Friday morning, with
  some improvement in road conditions by midday Friday.

* OTHER IMPACTS...Heavy snow will reduce visibility below a
  quarter mile at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter storm warning means significant amounts of snow, and or
blowing snow are expected or occurring. This could make travel
very hazardous or impossible. If you must travel keep some food,
water, and an extra flashlight in your vehicle in case of an
emergency. Check the latest road conditions at wyoroad.info or by
dialing 5 1 1.

&&

$$

WYZ015-272230-
/O.CON.KRIW.WS.W.0015.170428T0000Z-170429T0600Z/
Wind River Mountains East-
514 AM MDT Thu Apr 27 2017

...WINTER STORM WARNING REMAINS IN EFFECT FROM 6 PM THIS EVENING
TO MIDNIGHT MDT FRIDAY NIGHT...

* TIMING...Periods of snow will become steadier and heavier late
  today and continue into Friday evening.

* Snow Accumulation...8 to 15 inches.

* MAIN IMPACT...Slushy to snow packed roads will make travel
  difficult, including over South Pass.

* OTHER IMPACTS...Heavy snow will reduce visibility below a
  quarter mile at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter storm warning means significant amounts of snow, and or
blowing snow are expected or occurring. This could make travel
very hazardous or impossible. If you must travel keep some food,
water, and an extra flashlight in your vehicle in case of an
emergency. Check the latest road conditions at wyoroad.info or by
dialing 5 1 1.

&&

$$

WYZ001-002-272230-
/O.CON.KRIW.WW.Y.0026.000000T0000Z-170428T1200Z/
Yellowstone National Park-Absaroka Mountains-
Including the cities of Lake, Mammoth, and Old Faithful
514 AM MDT Thu Apr 27 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM MDT
FRIDAY...

* TIMING...Snow showers will continue into tonight. The heaviest
  snow is expected this morning.

* ESTIMATED SNOWFALL THROUGH 2 AM THURSDAY...2 to 6 inches.

* TOTAL SNOW...6 to 12 inches.

* MAIN IMPACT...Highways will become slick and snow covered,
  including Chief Joseph Highway. Visibility could be reduced to
  under one quarter mile at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter weather advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
and slick roads with limited visibilities. Slow down, and allow
extra time to reach your destination. Check the latest road
conditions at wyoroad.info or by dialing 5 1 1.

&&

$$

WYZ012-271800-
/O.CON.KRIW.WW.Y.0026.000000T0000Z-170427T1800Z/
Teton and Gros Ventre Mountains-
514 AM MDT Thu Apr 27 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT
TODAY...

* TIMING...Periods of snow will continue today. The heaviest snow
  will occur through 9 AM, before the snow begins to decrease in
  coverage and intensity.

* ESTIMATED SNOWFALL THROUGH 2 AM THURSDAY...2 to 4 inches.

* TOTAL SNOWFALL...6 to 12 inches.

* MAIN IMPACTS...Teton and Togwotee mountain passes will be slick
  and snow covered. Visibility could be reduced to under a quarter
  mile at times especially in heavier snow this morning.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter weather advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
and slick roads with limited visibilities. Slow down, and allow
extra time to reach your destination. Check the latest road
conditions at wyoroad.info or by dialing 5 1 1.

&&

$$

WYZ024-271800-
/O.CON.KRIW.WW.Y.0026.000000T0000Z-170427T1800Z/
Salt River and Wyoming Ranges-
514 AM MDT Thu Apr 27 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT
TODAY...

* TIMING...Snow showers continue today. The heaviest snow will
  occur this morning.

* ESTIMATED SNOWFALL THROUGH 2 AM THURSDAY...2 to 5 inches.

* TOTAL SNOWFALL...5 to 10 inches.

* MAIN IMPACT...Highways will become slick, slushy or snow
  covered, including Salt Pass. Visibility could be reduced to
  under a quarter mile at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter weather advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
and slick roads with limited visibilities. Slow down, and allow
extra time to reach your destination. Check the latest road
conditions at wyoroad.info or by dialing 5 1 1.

&&

$$

WYZ013-023-271800-
/O.CON.KRIW.WW.Y.0026.000000T0000Z-170427T1800Z/
Jackson Hole-Star Valley-
Including the cities of Jackson, Afton, Alpine,
Star Valley Ranch, and Thayne
514 AM MDT Thu Apr 27 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT
TODAY...

* TIMING...Periods of snow today with the heaviest snow expected
  through about 9 AM. Star Valley could still see some rain early
  this morning, but any rain should change quickly to snow this
  morning.

* TOTAL SNOW...1 to 4 inches.

* MAIN IMPACT...Highways will be mainly wet across Star Valley,
  but vary from wet to slick or slushy in spots across Jackson
  Hole especially from Moose northward. Mountain Pass will be
  slick and hazardous with very low visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter weather advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
and slick roads with limited visibilities. Slow down, and allow
extra time to reach your destination. Check the latest road
conditions at wyoroad.info or by dialing 5 1 1.

&&

$$

WYZ003-004-272230-
/O.CON.KRIW.WW.Y.0026.170427T1200Z-170428T1800Z/
Cody Foothills-North Big Horn Basin-
Including the cities of Cody and Meeteetse
514 AM MDT Thu Apr 27 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT
FRIDAY...

* TIMING...A mix of rain and snow across the Cody Foothills and
  the northern Big Horn Basin will change to snow today, and
  continue into Friday.

* TOTAL SNOW...3 to 6 inches with locally higher amounts in the
  Cody Foothills. 1 to 3 inches in the Greybull to Lovell
  corridor.

* MAIN IMPACT...Highways will be mainly wet today, but will
  increasing become slick, slushy or snow covered after sunset,
  and remain hazardous through Friday morning. The worst driving
  conditions are expected in the Cody Foothills, including Highway
  120 tonight and Friday morning.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter weather advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
and slick roads with limited visibilities. Slow down, and allow
extra time to reach your destination. Check the latest road
conditions at wyoroad.info or by dialing 5 1 1.

&&

$$

WYZ005>007-272230-
/O.CON.KRIW.WW.Y.0026.170427T1200Z-170429T0600Z/
Southwest Big Horn Basin-Southeast Big Horn Basin-
Owl Creek and Bridger Mountains-
Including the cities of Thermopolis and Worland
514 AM MDT Thu Apr 27 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT
FRIDAY NIGHT...

* TIMING...Occasional snow will fall today and continue through
  Friday evening.

* TOTAL SNOW...3 to 6 inches in the lower elevations of Hot
  Springs County. 6 to 12 inches in the Owl and Bridger mountains.
  1 to 4 inches in Washakie County with the heaviest in Nowood
  Valley.

* MAIN IMPACT...Highways will be mainly wet today, but will
  increasing become slick, slushy or snow covered after sunset,
  and remain hazardous through Friday morning. The worst driving
  conditions are expected along highway 120 northwest of
  Thermopolis.

* OTHER IMPACTS...Additional rock or mudslides could occur in the
  Wind River Canyon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter weather advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
and slick roads with limited visibilities. Slow down, and allow
extra time to reach your destination. Check the latest road
conditions at wyoroad.info or by dialing 5 1 1.

&&

$$

WYZ022-272230-
/O.CON.KRIW.WW.Y.0026.170428T0000Z-170429T0600Z/
Casper Mountain-
514 AM MDT Thu Apr 27 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS
EVENING TO MIDNIGHT MDT FRIDAY NIGHT...

* TIMING...Occasional snow will become steadier and heavier
  toward evening and continue into Friday evening.

* Snow Accumulation...6 to 12 inches.

* MAIN IMPACT...Slushy to snow packed roads will make travel
  difficult.

* OTHER IMPACTS...Heavy snow will reduce visibility below a
  quarter mile at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter weather advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
and slick roads with limited visibilities. Slow down, and allow
extra time to reach your destination. Check the latest road
conditions at wyoroad.info or by dialing 5 1 1.

&&

$$

WYZ008-272230-
/O.CON.KRIW.WW.Y.0026.170427T1200Z-170429T0600Z/
Bighorn Mountains West-
514 AM MDT Thu Apr 27 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT
FRIDAY NIGHT...

* TIMING...Snow will develop over the Bighorn mountains this
  morning, and then continue heavy at times through Friday
  evening.

* Snow Accumulation...6 to 12 inches.

* MAIN IMPACT...Slushy to snow packed roads will make travel
  difficult on Powder River and Granite Mountain Passes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter weather advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
and slick roads with limited visibilities. Slow down, and allow
extra time to reach your destination. Check the latest road
conditions at wyoroad.info or by dialing 5 1 1.

&&

$$

WYZ017-018-272230-
/O.CON.KRIW.WW.Y.0026.170428T0000Z-170429T0600Z/
Wind River Basin-Lander Foothills-
Including the cities of Riverton, Shoshoni, and Lander
514 AM MDT Thu Apr 27 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS
EVENING TO MIDNIGHT MDT FRIDAY NIGHT...

* TIMING...A mix of rain and snow will change to snow tonight
  and continue into Friday evening.

* Snow Accumulation...3 to 6 inches. However, locally heavier
  amounts in more persistent snow bands are possible.

* MAIN IMPACT...Roads may become slushy to snow covered especially
  where heavier snow persists.

* OTHER IMPACTS...Additional rock or mudslides could occur in the
  Wind River Canyon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter weather advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
and slick roads with limited visibilities. Slow down, and allow
extra time to reach your destination. Check the latest road
conditions at wyoroad.info or by dialing 5 1 1.

&&

$$

WYZ019-272230-
/O.CON.KRIW.WW.Y.0026.170428T0000Z-170429T0600Z/
Green Mountains and Rattlesnake Range-
Including the city of Jeffrey City
514 AM MDT Thu Apr 27 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS
EVENING TO MIDNIGHT MDT FRIDAY NIGHT...

* TIMING...Occasional snow will become steadier and heavier
  toward evening and continue into Friday evening.

* Snow Accumulation...3 to 6 inches with locally higher amounts.

* MAIN IMPACT...Slushy to snow packed roads may develop especially
  after sunset tonight.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter weather advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
and slick roads with limited visibilities. Slow down, and allow
extra time to reach your destination. Check the latest road
conditions at wyoroad.info or by dialing 5 1 1.

&&

$$

Team Riverton/21



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