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

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WWUS45 KRIW 181802
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
1202 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.

WYZ002-181915-
/O.EXP.KRIW.WW.Y.0027.000000T0000Z-170518T1800Z/
Absaroka Mountains-
1202 PM MDT Thu May 18 2017

...WINTER WEATHER ADVISORY WILL EXPIRE AT NOON MDT TODAY...

The strong late spring weather system that delivered the 4 to 13
inches of snowfall to the Absaroka Mountains has exited to the
southeast and most of the snowfall has diminished. Therefore the
winter weather advisory has been allowed to expire.


$$

WYZ008-009-190000-
/O.CON.KRIW.WS.W.0016.000000T0000Z-170519T0000Z/
Bighorn Mountains West-Bighorn Mountains Southeast-
1202 PM 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.

* 3 to 6 inches have fallen so far in some areas on the west slope
  and 6 to 12 inches on the east slope.

* Additional snowfall expected today...4 to 8 inches for a total of
  7 to 14 inches with local amounts of up to 20 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.

&&

$$

WYZ022-190100-
/O.CON.KRIW.WS.W.0016.000000T0000Z-170519T1200Z/
Casper Mountain-
1202 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.

&&

$$

WYZ019-190100-
/O.CON.KRIW.WS.W.0016.000000T0000Z-170519T1200Z/
Green Mountains and Rattlesnake Range-
Including the city of Jeffrey City
1202 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
  through today...continuing through tonight.

* Snow Accumulation...3 inches have fallen so far. 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.

&&

$$

WYZ015-190100-
/O.CON.KRIW.WS.W.0016.000000T0000Z-170519T1200Z/
Wind River Mountains East-
1202 PM 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...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.

&&

$$

WYZ020-190100-
/O.CON.KRIW.WW.Y.0027.000000T0000Z-170519T1200Z/
Natrona County Lower Elevations-
Including the city of Casper
1202 PM MDT Thu May 18 2017

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

* TIMING...The precipitation will remain all snow this afternoon.
  Periods of moderate snow will continue through tonight.

* 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.

&&

$$

WYZ010-011-190100-
/O.CON.KRIW.WW.Y.0027.000000T0000Z-170519T1200Z/
Northeast Johnson County-Southeast Johnson County-
Including the cities of Buffalo and Kaycee
1202 PM 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 afternoon 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.

&&

$$

WYZ017-018-190100-
/O.CON.KRIW.WW.Y.0027.000000T0000Z-170519T1200Z/
Wind River Basin-Lander Foothills-
Including the cities of Riverton, Shoshoni, and Lander
1202 PM MDT Thu May 18 2017

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

* TIMING...Snowfall along with some rain along the river bottoms
  below 5000 feet will become all snow everywhere early this
  afternoon. 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...Two and a half 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.

&&

$$

WYZ007-190100-
/O.CON.KRIW.WW.Y.0027.000000T0000Z-170519T1200Z/
Owl Creek and Bridger Mountains-
1202 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.

&&

$$

WYZ030-190100-
/O.CON.KRIW.WW.Y.0027.000000T0000Z-170519T1200Z/
East Sweetwater County-
Including the city of Wamsutter
1202 PM 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.

&&

$$

TEAM RIVERTON



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