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

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WWUS45 KRIW 211907
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
107 PM MDT Thu Sep 21 2017

...Significant Snowfall over the Northwestern Mountains through
Friday...

.A storm system will bring significant precipitation across
northwestern Wyoming through the day Friday. Snow levels over
northwest Wyoming will vary from 8000 to 9000 feet into this
evening. The snow levels are then expected to drop back down to
around 7000 to 8000 feet late tonight into Friday. The heaviest
precipitation is expected to occur tonight into Friday morning.

WYZ014-015-221200-
/O.EXB.KRIW.WW.Y.0033.170922T0300Z-170922T1800Z/
Wind River Mountains West-Wind River Mountains East-
107 PM MDT Thu Sep 21 2017

...WINTER WEATHER ADVISORY IN EFFECT FROM 9 PM THIS EVENING TO
NOON MDT FRIDAY...

The National Weather Service in Riverton has issued a Winter
Weather Advisory for snow, which is in effect from 9 PM this
evening to noon MDT Friday.

* TIMING...A period of significant snow is expected again later
  this evening into Friday morning before decreasing into Friday
  afternoon. The significant snowfall is only expected on the
  north half of the range roughly north of a line from Pinedale to
  Crowheart. Very little snow is expected further south and mainly
  above 9,000 to 10,000 feet.

* SNOWFALL TOTALS...5 to 9 inches north half of the range with
  very little or no snow over South Pass.

* MAIN IMPACT...Togwotee Pass will become snow covered again.
  Backcountry travellers and hunters should be prepared for a
  round of heavy wet snow and snow covered roads, especially over
  Union Pass.

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 before venturing out.

&&

$$

WYZ012-221200-
/O.EXT.KRIW.WW.Y.0033.000000T0000Z-170922T2100Z/
Teton and Gros Ventre Mountains-
107 PM MDT Thu Sep 21 2017

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 3 PM MDT FRIDAY...

* TIMING...After periods of light snow into this evening, another
  bout of moderate to heavy snow is expected later tonight into
  Friday morning.

* SNOWFALL TOTALS...6 to 12 inches so far.

* NEW SNOWFALL...4 TO 7 inches by noon Friday with locally heavier
  amounts in the Gros Ventre range.

* MAIN IMPACT...Teton and Togwotee mountain passes will become
  slick again later tonight into Friday morning. Back country
  travellers and hunters should be prepared for wet 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.

&&

$$

WYZ001-221200-
/O.CON.KRIW.WW.Y.0033.000000T0000Z-170923T0000Z/
Yellowstone National Park-
Including the cities of Lake, Mammoth, and Old Faithful
107 PM MDT Thu Sep 21 2017

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

* TIMING...Periods of snow will impact much of Yellowstone
  National Park through the day Friday. The lowest elevations
  could be mixture of rain and snow at times.

* NEW SNOWFALL...4 to 8 inches in the mountains and at pass level
  with 1 to 4 inches across the lower elevations. The least being
  around Mammoth.

* MAIN IMPACT...Mountain passes in Yellowstone will be slick and
  hazardous at times, especially tonight and Friday morning.

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 before venturing out.

&&

$$

WYZ002-221200-
/O.CON.KRIW.WW.Y.0033.000000T0000Z-170923T0000Z/
Absaroka Mountains-
107 PM MDT Thu Sep 21 2017

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

* TIMING...Periods of snow will impact the Absaroka Mountains
  through the day Friday. The heaviest precipitation is expected
  to occur later tonight into Friday morning where snowfall rates
  near an inch an hour could occur.

* NEW SNOWFALL...5 to 10 inches above 9500 feet with up to 12
  inches possible on Beartooth Pass. Chief Joseph highway at Dead
  Indian Pass should see 4 to 8 inches. 2 inches or less is
  expected at Pahaska.

* MAIN IMPACT...Chief Joseph Highway will be slick and hazardous
  at times especially at Dead Indian Pass. Backcountry travellers
  and hunters should be prepared for another round of heavy wet
  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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