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

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WWUS45 KRIW 200241
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URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
841 PM MDT Tue Sep 19 2017

...Snow showers and isolated thunderstorms to continue into early
this this evening... ...A new storm system will take aim on the
area Wednesday night into at least Friday...

.A cold wet pacific low pressure trough and associated cold front
will keep numerous snow showers across the northwest mountains
into early this evening along with isolated thunderstorms. The
heavier snowfall is expected above 8500 feet where 4 to 10 inches
of snow can be expected through 9 pm mdt this evening. Snowfall
from 7500 to 8500 feet is expected to be from 2 to 5 inches.
Additionally, strong gusty west winds are also expected.

A new storm system will bring more snow to the region Wednesday
night through at least Friday. A quick bout of significant
accumulation is expected Wednesday night before a break in some
areas. The Wind River Mountains could see a more sustained period
of Wednesday night into Friday. Stay tuned for more statements on
this new potential storm for the second half of the week.

WYZ014-015-201000-
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Wind River Mountains West-Wind River Mountains East-
841 PM MDT Tue Sep 19 2017

...WINTER STORM WATCH REMAINS IN EFFECT FROM WEDNESDAY EVENING
THROUGH FRIDAY MORNING...
...WINTER WEATHER ADVISORY WILL EXPIRE AT 9 PM MDT THIS EVENING...

* TIMING...Snow showers will continue across the Wind River
  mountains into early this evening. Total snowfall will range
  from 4 to 11 inches above 8500 feet with snow accumulations of
  3 to 6 inches from 7500 to 8500 feet. Very little snowfall
  though is expected over South Pass. Snowfall will taper off by
  9 pm mdt this evening. Strong gusty west winds are also
  expected on the passes and higher ridges.

* TIMING STORM NUMBER TWO...A new storm system will move into
  the Wind River Mountains Wednesday night and continue at least
  through Friday morning. In fact, there are some indications
  after a possible break in the snow Friday afternoon, another
  round of accumulating snow is possible Friday night and
  Saturday. This new storm system will move quickly in Wednesday
  evening with snow expected at times into Friday. The storm
  will be rather warm initially with rain expected over South
  Pass Wednesday night and Thursday before changing over to
  snow. Togwotee Pass will likely be cold enough for snow
  throughout the event.

* SNOWFALL...4 to 11 inches above 8500 feet with 3 to 6 inches
  down to 7500 feet from our current storm. Storm number two
  will have the potential to produce 1 to 2 feet of snow from
  Wednesday night through Friday morning, especially the north
  half of the range. Much less snow is expected over South Pass
  with only 2 to 6 inches possible.

* MAIN IMPACT...Snow and wind may make travel difficult above
  8500 feet...mainly over Togwotee Pass.

* OTHER IMPACTS...Campers and hunters should be prepared for
  cold snowy and windy conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter storm watch means there is a potential for significant
snow and/or blowing snow that may impact travel. Continue to
monitor the latest forecasts.

&&

$$

WYZ001-200345-
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Yellowstone National Park-
Including the cities of Lake, Mammoth, and Old Faithful
841 PM MDT Tue Sep 19 2017

...WINTER WEATHER ADVISORY WILL EXPIRE AT 9 PM MDT THIS EVENING...

The winter weather advisory for Yellowstone National Park will be
allowed to expire at 9 PM. However, isolated light snow showers will
continue to fall overnight with localized areas receiving up to 1
inch of additional accumulation.

$$

WYZ002-200345-
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Absaroka Mountains-
841 PM MDT Tue Sep 19 2017

...WINTER WEATHER ADVISORY WILL EXPIRE AT 9 PM MDT THIS EVENING...

The winter weather advisory for the Absaroka Mountains will be
allowed to expire at 9 PM. However, isolated light snow showers
will continue to fall overnight with localized areas receiving up
to 1 inch of additional accumulation.

$$

WYZ012-200345-
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Teton and Gros Ventre Mountains-
841 PM MDT Tue Sep 19 2017

...WINTER WEATHER ADVISORY WILL EXPIRE AT 9 PM MDT THIS EVENING...

The winter weather advisory for the Teton and Gros Ventre
Mountains will be allowed to expire at 9 PM. However, isolated
light snow showers will continue to fall overnight with localized
areas receiving up to a half inch of additional accumulation.

$$



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