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

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WWUS45 KRIW 190014
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
614 PM MDT Thu May 18 2017

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

.A vigorous late season winter storm has come together today.
Copious amounts of moisture will continue to 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. In the basins,
the snow will fluctuate in elevation through the day, becoming
mostly snow by later this afternoon.

WYZ009-190115-
/O.EXP.KRIW.WS.W.0016.000000T0000Z-170519T0000Z/
Bighorn Mountains Southeast-
614 PM MDT Thu May 18 2017

...WINTER STORM WARNING HAS EXPIRED...

Snowfall has ended or become light across most of the Bighorn
Range this evening; therefore, the Winter Storm Warning has been
allowed to expire.

$$

WYZ010-190115-
/O.CAN.KRIW.WW.Y.0027.000000T0000Z-170519T1200Z/
Northeast Johnson County-
Including the city of Buffalo
614 PM MDT Thu May 18 2017

...WINTER WEATHER ADVISORY IS CANCELLED...

The National Weather Service in Riverton has cancelled the Winter
Weather Advisory.

Significant snowfall is no longer expected to make it as far north
as Interstate 90 and northward; most of the accumulating snowfall
is expected to stay in the southeast portion of Johnson County
tonight.

$$

WYZ022-190815-
/O.CON.KRIW.WS.W.0016.000000T0000Z-170519T1200Z/
Casper Mountain-
614 PM 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...5 inches of snow have fallen so far on the
  mountain. 10 to 16 inches of total snow accumulation is
  expected.

* 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.

&&

$$

WYZ019-190815-
/O.CON.KRIW.WS.W.0016.000000T0000Z-170519T1200Z/
Green Mountains and Rattlesnake Range-
Including the city of Jeffrey City
614 PM 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 will
  continue this evening...and gradually taper off early Friday
  morning.

* Snow Accumulation...Around 6 to 7 inches have fallen so far in
  Jeffrey City. Total snow accumulations will range from 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.

&&

$$

WYZ015-190815-
/O.CON.KRIW.WS.W.0016.000000T0000Z-170519T1200Z/
Wind River Mountains East-
614 PM MDT Thu May 18 2017

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

* TIMING...Periods through tonight with the heaviest snow
  occurring through this evening along the central and southern
  sections of eastern slopes of the Wind River Mountains.

* Snow Accumulation...One foot of snow has already fallen across
  some areas along the east Slope of the Wind River Mountains
  above 9000 feet. A snow total of 10 to 18 inches is expected.

* 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.

&&

$$

WYZ020-190815-
/O.CON.KRIW.WW.Y.0027.000000T0000Z-170519T1200Z/
Natrona County Lower Elevations-
Including the city of Casper
614 PM MDT Thu May 18 2017

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

* TIMING...Periods of moderate snow will continue through
  tonight, gradually tapering off early Friday morning.

* TOTAL SNOW...2 to 4 inches of snowfall have already fallen
  between Waltman and the town of Natrona. 3 to 5 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.

&&

$$

WYZ011-190815-
/O.CON.KRIW.WW.Y.0027.000000T0000Z-170519T1200Z/
Southeast Johnson County-
Including the city of Kaycee
614 PM MDT Thu May 18 2017

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

* TIMING...A rain and snow mix will become all snow this evening
  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.

&&

$$

WYZ017-018-190815-
/O.CON.KRIW.WW.Y.0027.000000T0000Z-170519T1200Z/
Wind River Basin-Lander Foothills-
Including the cities of Riverton, Shoshoni, and Lander
614 PM MDT Thu May 18 2017

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

* TIMING...Periods of snow will continue tonight with snow
  possibly mixed with rain at times below 5200 feet this evening.
  Snow will gradually taper off early Friday morning.

* Total Snow Accumulation...Three inches of snowfall has already
  accumulated at the National Weather Service office on Griffy
  Hill. 1 to 4 inches around Riverton is expected 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.

&&

$$

WYZ007-190815-
/O.CON.KRIW.WW.Y.0027.000000T0000Z-170519T1200Z/
Owl Creek and Bridger Mountains-
614 PM MDT Thu May 18 2017

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

* TIMING...Moderate to heavy snowfall will continue continue
  through tonight.

* TOTAL SNOW...4 inches of snowfall have already occurred along
  the higher Owl Creek Mountains. 5 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.

&&

$$

WYZ030-190815-
/O.CON.KRIW.WW.Y.0027.000000T0000Z-170519T1200Z/
East Sweetwater County-
Including the city of Wamsutter
614 PM MDT Thu May 18 2017

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

* TIMING...Periods of snow will continue this evening, and
  gradually taper off early Friday morning.

* 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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