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

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WWUS45 KRIW 180707
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
107 AM MDT Thu May 18 2017

...LATE SEASON WINTER STORM TO IMPACT CENTRAL AND NORTHERN
WYOMING THROUGH TONIGHT...

.A vigorous late season winter storm will come together today.
Copious amounts of moisture will wrap around a rapidly developing
cyclone and combine with unseasonably cold temperatures to give
significant areas of rain and snowfall across portions of northern
and central Wyoming. Snow will descend into the lower elevations
this morning and fluctuate in elevation through the day, becoming
mostly snow late tonight.

WYZ008-009-181230-
/O.CON.KRIW.WS.W.0016.000000T0000Z-170519T0000Z/
Bighorn Mountains West-Bighorn Mountains Southeast-
107 AM MDT Thu May 18 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* TIMING...Periods of moderate to heavy snow will fall through
  today.

* Snow Accumulation...10 to 20 inches across the northern Bighorn
  Mountains...6 to 12 inches over the southern portion of the
  mountains.

* MAIN IMPACT...Slushy to snow packed roads will make travel
  difficult on Powder River and especially Granite Mountain
  Passes. Visibility could be reduced to under one quarter mile
  at times in heavy snow.

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.

&&

$$

WYZ022-181230-
/O.CON.KRIW.WS.W.0016.000000T0000Z-170519T1200Z/
Casper Mountain-
107 AM MDT Thu May 18 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM MDT FRIDAY...

* TIMING...Periods of moderate to heavy snow will continue through
  tonight.

* Snow Accumulation...10 to 16 inches.

* MAIN IMPACT...Slushy to snow packed roads will make travel
  difficult. Visibility could be reduced to under one quarter
  mile at times in heavy snow.

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.

&&

$$

WYZ019-181230-
/O.CON.KRIW.WS.W.0016.000000T0000Z-170519T1200Z/
Green Mountains and Rattlesnake Range-
Including the city of Jeffrey City
107 AM MDT Thu May 18 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM MDT FRIDAY...

* TIMING...Periods of moderate to heavy snow will increase through
  today...continuing through tonight.

* Snow Accumulation...4 to 10 inches...locally higher above 7500
  feet.

* MAIN IMPACT...Slushy to snow packed roads will make travel
  difficult on highway 287 from Beaver Rime to Muddy Gap.
  Visibility could be reduced to under one quarter mile at times
  in heavy snow.

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.

&&

$$

WYZ015-181230-
/O.CON.KRIW.WS.W.0016.000000T0000Z-170519T1200Z/
Wind River Mountains East-
107 AM MDT Thu May 18 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM MDT FRIDAY...

* TIMING...Periods of moderate to heavy snow will increase
  today...continuing through tonight.

* Snow Accumulation...10 to 18 inches from South Pass, highway
  28, and Togwotee Pass, highway 26.

* MAIN IMPACT...Slushy to snow packed roads will make travel
  difficult on South pass and Togwotee pass. Visibility could be
  reduced to under one quarter mile at times in heavy snow.

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.

&&

$$

WYZ001-181200-
/O.CON.KRIW.WW.Y.0027.000000T0000Z-170518T1200Z/
Yellowstone National Park-
Including the cities of Lake, Mammoth, and Old Faithful
107 AM MDT Thu May 18 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM MDT EARLY
THIS MORNING...

* TIMING...Moderate to occasionally heavy snowfall will continue
  across much of Yellowstone area above 6500 feet.

* TOTAL SNOW...An additional 5 to 14 inches in the mountains by
  sunrise...heaviest across the eastern mountains in the Park.

* MAIN IMPACT...Highways may become slick, slushy and snow
  covered. Visibility could be reduced to under one quarter mile
  at times in heavy snow.

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.

&&

$$

WYZ002-181230-
/O.CON.KRIW.WW.Y.0027.000000T0000Z-170518T1800Z/
Absaroka Mountains-
107 AM MDT Thu May 18 2017

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

* TIMING...Moderate to heavy snowfall will continue across the
  Absaroka Mountains through this morning.

* TOTAL SNOW...6 to 18 inches in the mountains...heaviest
  snowfall expected across the far northern Absarokas.

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

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.

&&

$$

WYZ020-181230-
/O.CON.KRIW.WW.Y.0027.000000T0000Z-170519T1200Z/
Natrona County Lower Elevations-
Including the city of Casper
107 AM MDT Thu May 18 2017

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

* TIMING...Moderate to heavy snowfall will increase this morning
  and continue through tonight.

* TOTAL SNOW...3 to 6 inches, locally heavier near Casper
  Mountain.

* MAIN IMPACT...Highways may become slick, slushy and snow
  covered, including Interstate 25, and highways 26 and 220.
  Visibility could be reduced to under one quarter mile at times
  in heavy snow.

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.

&&

$$

WYZ010-011-181230-
/O.CON.KRIW.WW.Y.0027.000000T0000Z-170519T1200Z/
Northeast Johnson County-Southeast Johnson County-
Including the cities of Buffalo and Kaycee
107 AM MDT Thu May 18 2017

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

* TIMING...Moderate to heavy snowfall will increase this morning
  and continue through tonight.

* TOTAL SNOW...2 to 6 inches, locally higher near the Bighorn
  mountains.

* MAIN IMPACT...Highways may become slick, slushy and snow
  covered, including Interstates 25 and 90. Visibility could be
  reduced to under one quarter mile at times in heavy snow.

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.

&&

$$

WYZ017-018-181230-
/O.CON.KRIW.WW.Y.0027.170518T0900Z-170519T1200Z/
Wind River Basin-Lander Foothills-
Including the cities of Riverton, Shoshoni, and Lander
107 AM MDT Thu May 18 2017

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

* TIMING...Moderate to heavy snowfall will increase this morning
  continuing through tonight.

* TOTAL SNOW...2 to 6 inches, locally higher near Sinks Canyon
  and Red Canyon.

* MAIN IMPACT...Highways may become slick, slushy and snow
  covered, including Highways 789 and 287. Visibility could be
  reduced to under one quarter mile at times in heavy snow.

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.

&&

$$

WYZ007-181230-
/O.CON.KRIW.WW.Y.0027.170518T0900Z-170519T1200Z/
Owl Creek and Bridger Mountains-
107 AM MDT Thu May 18 2017

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

* TIMING...Moderate to heavy snowfall will increase this morning
  and continue through tonight.

* TOTAL SNOW...4 to 10 inches.

* MAIN IMPACT...Wind River Canyon may become slick, slushy and
  snow covered. Visibility could be reduced to under one quarter
  mile at times in heavy snow.

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.

&&

$$

WYZ030-181230-
/O.CON.KRIW.WW.Y.0027.170518T0900Z-170519T1200Z/
East Sweetwater County-
Including the city of Wamsutter
107 AM MDT Thu May 18 2017

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

* TIMING...Moderate to heavy snowfall will increase this morning
  and continue through tonight.

* TOTAL SNOW...3 to 6 inches.

* MAIN IMPACT...Interstate 80 and Highway 28 may become slick,
  slushy and snow covered. Visibility could be reduced to under
  one quarter mile at times in heavy snow.

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.

&&

$$



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