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

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WWUS45 KRIW 181159
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
559 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.

WYZ001-181300-
/O.EXP.KRIW.WW.Y.0027.000000T0000Z-170518T1200Z/
Yellowstone National Park-
Including the cities of Lake, Mammoth, and Old Faithful
559 AM MDT Thu May 18 2017

...WINTER WEATHER ADVISORY WILL EXPIRE AT 6 AM MDT EARLY THIS
MORNING...

Lingering snowfall especially over the eastern portions of the
Yellowstone will gradually come to an end this morning. Additional
snowfall amounts are expected to be light. Estimated snowfall
totals from Tuesday night through early Thursday morning ranged
from 5 to 10 inches with isolated areas around a foot.

$$

WYZ008-009-182300-
/O.CON.KRIW.WS.W.0016.000000T0000Z-170519T0000Z/
Bighorn Mountains West-Bighorn Mountains Southeast-
559 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.

* Estimated snow accumulation through around midnight Wednesday
  night...4 to 8 inches.

* Additional snowfall expected today...4 to 8 inches.

* MAIN IMPACT...Powder River and Granite mountain passes will be
  slushy to snow packed making 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.

&&

$$

WYZ022-182300-
/O.CON.KRIW.WS.W.0016.000000T0000Z-170519T1200Z/
Casper Mountain-
559 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 on Casper Mountain. 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.

&&

$$

WYZ019-182300-
/O.CON.KRIW.WS.W.0016.000000T0000Z-170519T1200Z/
Green Mountains and Rattlesnake Range-
Including the city of Jeffrey City
559 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.

&&

$$

WYZ015-182300-
/O.CON.KRIW.WS.W.0016.000000T0000Z-170519T1200Z/
Wind River Mountains East-
559 AM MDT Thu May 18 2017

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

* TIMING...Periods of moderate to heavy snow through tonight with
  the heaviest snow occurring today along the central and southern
  sections of eastern slopes of the Wind River Mountains.

* Snow Accumulation...10 to 18 inches.

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

&&

$$

WYZ002-181800-
/O.CON.KRIW.WW.Y.0027.000000T0000Z-170518T1800Z/
Absaroka Mountains-
559 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 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.

&&

$$

WYZ020-182300-
/O.CON.KRIW.WW.Y.0027.000000T0000Z-170519T1200Z/
Natrona County Lower Elevations-
Including the city of Casper
559 AM MDT Thu May 18 2017

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

* TIMING...A mixture of rain and snow across Natrona County early
  this morning will gradually turn to mainly snow this morning.
  Periods of moderate snow is then expected at times through
  tonight.

* TOTAL SNOW...2 to 4 inches with locally higher amounts possible
  in the foothills of Casper Mountain, and across western Natrona
  County in the Waltman and Hiland areas.

* IMPACT...Roads will vary from wet to becoming slick at times
  during bursts of heavier snow. Visibility in heavier snow will
  be half 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.

&&

$$

WYZ010-011-182300-
/O.CON.KRIW.WW.Y.0027.000000T0000Z-170519T1200Z/
Northeast Johnson County-Southeast Johnson County-
Including the cities of Buffalo and Kaycee
559 AM MDT Thu May 18 2017

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

* TIMING...Rain is expected to change to snow this morning, and
  become moderate at times through tonight.

* TOTAL SNOW...2 to 4 inches, locally higher near the Bighorn
  mountains.

* MAIN IMPACT...Roads will vary from wet to becoming slick at
  times during bursts of heavier snow. Visibility in heavier snow
  will be half 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.

&&

$$

WYZ017-018-182300-
/O.CON.KRIW.WW.Y.0027.000000T0000Z-170519T1200Z/
Wind River Basin-Lander Foothills-
Including the cities of Riverton, Shoshoni, and Lander
559 AM MDT Thu May 18 2017

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

* TIMING...A mixture of rain and snow across the Wind River Basin
  early this morning will become mainly snow above 5000 feet this
  morning. Periods of moderate snowfall will then occur for the
  rest of today into tonight. The heaviest snowfall is expected
  during the day across the Lander Foothills.

* Total Snow Accumulation...1 to 3 inches around Riverton
  especially in the higher elevations northwest of town. 3 to 6
  inches in Lander with locally higher amounts near Sinks Canyon.

* MAIN IMPACT...Roads will vary from wet to becoming slick at
  times during bursts of heavier snow especially in the Lander
  Foothills. Visibility in heavier snow will be half mile or less
  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.

&&

$$

WYZ007-182300-
/O.CON.KRIW.WW.Y.0027.000000T0000Z-170519T1200Z/
Owl Creek and Bridger Mountains-
559 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...The heavy precipitation could cause rock or mud
  slides 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.

&&

$$

WYZ030-182300-
/O.CON.KRIW.WW.Y.0027.000000T0000Z-170519T1200Z/
East Sweetwater County-
Including the city of Wamsutter
559 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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