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

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WWUS45 KRIW 161959
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
1259 PM MST Thu Nov 16 2017

...Heavy Snow in the many of the western mountains through
at least Friday afternoon...
...Heavy snow in the Star Valley late tonight through Friday
afternoon...
...Periods of snow developing in the Jackson Valley late tonight
through Friday afternoon...

.A strong storm system will impact the west through at least late
Friday afternoon. Expect snow in the mountains and a mix of rain
and snow in the valleys through this evening. A cold front will
move in tonight, dropping snow levels and bring the heaviest
period of snow of the storm for Thursday night and Friday. The
snow will be accompanied by gusty winds with areas of blowing
snow.

WYZ023-171100-
/O.UPG.KRIW.WS.A.0026.171117T0700Z-171118T0000Z/
/O.EXB.KRIW.WS.W.0021.171117T0700Z-171118T0000Z/
Star Valley-
Including the cities of Afton, Alpine, Star Valley Ranch,
and Thayne
1259 PM MST Thu Nov 16 2017

...WINTER STORM WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 5 PM
MST FRIDAY...

* WHAT...Rain will change to snow after midnight with periods of
  heavy snow showers from early Friday through late Friday
  afternoon. Snowfall rates could be around an inch per hour on
  Friday. The northern part of the Star Valley will likely see
  the heavier snow amounts, especially around Alpine and along the
  west slope of the foothills. Snowfall amounts will vary from 4
  to 8 inches with locally higher amounts. The snow will be
  accompanied by strong southwest wind 20 to 30 mph and gusty.

* WHERE...Star Valley.

* WHEN...Midnight to 5 PM Friday.

* ADDITIONAL DETAILS...Be prepared for significant reductions in
  visibility at times. Travel will become difficult as this
  system develops.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions are expected. If you must travel, keep an extra
flashlight, food and water in your vehicle in case of an
emergency. The latest road conditions for the state you are
calling from can be obtained by calling 5 1 1.

$$

WYZ012-171100-
/O.CON.KRIW.WS.W.0021.000000T0000Z-171118T0000Z/
Teton and Gros Ventre Mountains-
1259 PM MST Thu Nov 16 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST FRIDAY...

* WHAT...Periods of snow continuing. Travel will be very difficult
  at times; especially during the evening commute on Thursday.
  Total snow accumulations of 1 to 2 feet with higher amounts
  quite possible on the west side of the Tetons. As of 11 am this
  morning, 6 to 12 inches of snow had already fallen above 8000
  feet.

* WHERE...Teton and Gros Ventre Mountains.

* WHEN...Through Friday. The heaviest snow from this storm will be
  tonight through Friday when heavy snow showers are expected. An
  isolated thunderstorm is even possible Friday. Snowfall rates of
  1 to 2 inches per hour will likely occur at times.

* ADDITIONAL DETAILS...Be prepared for significant reductions in
  visibility at times. Travel over Teton and Togwotee passes
  will become increasing worse as this system develops.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow and blowing snow means severe
winter weather conditions are occurring. If you must travel, keep
an extra flashlight, food and water in your vehicle in case of an
emergency. The latest road conditions for the state you are
calling from can be obtained by calling 5 1 1.

$$

WYZ024-171100-
/O.CON.KRIW.WS.W.0021.000000T0000Z-171118T0000Z/
Salt River and Wyoming Ranges-
1259 PM MST Thu Nov 16 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST FRIDAY...

* WHAT...Periods of snow continuing through Friday. The heaviest
  snow is expected late tonight through Friday. Total
  accumulations of 10 to 20 inches with local amounts up to 2
  feet. As of 11 am this morning, 3 to 7 inches of snow had
  already fallen across much of the area.

* WHERE...Salt River and Wyoming Ranges.

* WHEN...Through 5 PM Friday. The heaviest snow is expected late
  tonight through Friday afternoon when snowfall rates in excess
  of an inch per hours will occur at times. An isolated
  thunderstorm is even possible Friday.

* ADDITIONAL DETAILS...Be prepared for significant reductions in
  visibility at times. Travel over Salt Pass will become
  increasing worse as this system develops.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow and blowing snow means severe
winter weather conditions are occurring. If you must travel, keep
an extra flashlight, food and water in your vehicle in case of an
emergency. The latest road conditions for the state you are
calling from can be obtained by calling 5 1 1.

$$

WYZ014-171100-
/O.CON.KRIW.WS.W.0021.000000T0000Z-171118T0000Z/
Wind River Mountains West-
1259 PM MST Thu Nov 16 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST FRIDAY...

* WHAT...Periods of snow developing today and continuing through
  Friday. Total accumulations of 8 to 16 inches with up to 2 feet
  on the northern part of the range. However, amounts will be
  lighter around South Pass where only 3 to 5 inches is expected.
  As of 11 am this morning, the northern part of the range has
  already seen 4 to 8 inches of new snow.

* WHERE...West slopes of the Wind River Mountains.

* WHEN...Through Friday afternoon. The heaviest snow is expected
  late tonight through Friday afternoon when snowfall rates over
  an inch per hour are expected at times.

* ADDITIONAL DETAILS...Be prepared for significant reductions in
  visibility at times. Travel will become difficult as this
  system develops.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow and blowing snow means severe
winter weather conditions are occurring. If you must travel, keep
an extra flashlight, food and water in your vehicle in case of an
emergency. The latest road conditions for the state you are
calling from can be obtained by calling 5 1 1.

$$

WYZ013-171100-
/O.EXB.KRIW.WW.Y.0042.171117T0700Z-171118T0000Z/
Jackson Hole-
Including the city of Jackson
1259 PM MST Thu Nov 16 2017

...WINTER WEATHER ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO
5 PM MST FRIDAY...

* WHAT...Rain will change to snow after midnight with periods of
  snow through about sunset Friday. Some heavy snow showers are
  expected on Friday with even an isolated thunderstorm possible
  in the area. Snowfall amounts will vary from 3 to 6 inches with
  the higher amounts generally in the northern part of the valley
  and near the mountains.

* WHERE...Jackson Hole.

* WHEN...Midnight to 5 PM Friday.

* ADDITIONAL DETAILS...Be prepared for reduced visibilities at
  times as well as snow covered roads.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
roads and limited visibilities, and use caution while driving.
The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

$$

WYZ001-171100-
/O.CON.KRIW.WW.Y.0042.000000T0000Z-171118T0000Z/
Yellowstone National Park-
Including the cities of Lake, Mammoth, and Old Faithful
1259 PM MST Thu Nov 16 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST
FRIDAY...

* WHAT...Periods of snow continuing; mixing with rain at times in
  the lower elevations until this evening. Total snow
  accumulations of 3 to 9 inches on the valley floor, with
  localized amounts up to 18 inches in the southwest mountains,
  are expected. As of 11 am, 4 to 8 inches of new snow had
  already fallen in the mountains.

* WHERE...Yellowstone National Park.

* WHEN...Through Friday afternoon.

* ADDITIONAL DETAILS...Be prepared for reduced visibilities at
  times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow and blowing snow means periods
of snow and blowing snow will cause primarily travel
difficulties. Be prepared for snow covered roads and limited
visibilities, and use caution while driving. The latest road
conditions for the state you are calling from can be obtained by
calling 5 1 1.

$$

WYZ002-171100-
/O.CON.KRIW.WW.Y.0042.000000T0000Z-171118T0000Z/
Absaroka Mountains-
1259 PM MST Thu Nov 16 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST
FRIDAY...

* WHAT...Periods of snow expected. Plan on difficult travel
  conditions. Total snow accumulations of 3 to 10 inches, with
  over 18 inches expected in the southwest mountains. As of 11 am,
  3 to 7 inches had already fallen in the far west and southwest
  part of the Absaroka range.

* WHERE...Absaroka Mountains.

* WHEN...Today through Friday.

* ADDITIONAL DETAILS...Be prepared for reduced visibilities at
  times. Snow levels will lower to the valley floors tonight. The
  main threat of snow today will be in the far western and
  southwest mountains,spreading to all the area early Friday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow and blowing snow means periods
of snow and blowing snow will cause primarily travel
difficulties. Be prepared for snow covered roads and limited
visibilities, and use caution while driving. The latest road
conditions for the state you are calling from can be obtained by
calling 5 1 1.

$$

WYZ015-171100-
/O.CON.KRIW.WW.Y.0042.000000T0000Z-171118T0000Z/
Wind River Mountains East-
1259 PM MST Thu Nov 16 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST
FRIDAY...

* WHAT...Periods of snow through sunset Friday. Total snow
  accumulations of 6 to 10 inches; with lighter amounts around
  South Pass where only 3 to 5 inches is expected.

* WHERE...Wind River Mountains East.

* WHEN...Through late Friday afternoon. The heaviest snow is
  expected later tonight and Friday.

* ADDITIONAL DETAILS...Be prepared for reduced visibilities at
  times as well as snow covered roads, including South Pass.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow and blowing snow means periods
of snow and blowing snow will cause primarily travel
difficulties. Be prepared for snow covered roads and limited
visibilities, and use caution while driving. The latest road
conditions for the state you are calling from can be obtained by
calling 5 1 1.

$$

For more information from the National Weather Service visit
http://weather.gov/riw



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