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

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URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
234 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.

WYZ014-015-200315-
/O.NEW.KRIW.WS.A.0020.170921T0300Z-170922T1800Z/
/O.CON.KRIW.WW.Y.0031.000000T0000Z-170920T0300Z/
Wind River Mountains West-Wind River Mountains East-
234 PM MDT Tue Sep 19 2017

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

The National Weather Service in Riverton has issued a Winter
Storm Watch, which is in effect from Wednesday evening through
Friday morning.

* 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 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.

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.

&&

$$

WYZ001-200300-
/O.CON.KRIW.WW.Y.0031.000000T0000Z-170920T0300Z/
Yellowstone National Park-
Including the cities of Lake, Mammoth, and Old Faithful
234 PM MDT Tue Sep 19 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...

* TIMING...Snow showers and isolated thunderstorms continue into
  this evening. will become widespread across Yellowstone National
  Park. Periods of wet snow will bring total storm accumulations
  of 4 to 10 inches above 8500 feet with snow accumulations of 3
  to 5 inches from 7500 to 8500 feet. Snowfall will taper off by 9
  pm mdt this evening. Strong gusty west winds are also expected
  on the passes and higher ridges.

* ADDITIONAL ACCUMULATION...1 to 4 inches in locally heavy snow
  showers.

* MAIN IMPACT...Snow and wind may make travel difficult above
  8500 feet.

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

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 with Park officials.

&&

$$

WYZ002-200300-
/O.CON.KRIW.WW.Y.0031.000000T0000Z-170920T0300Z/
Absaroka Mountains-
234 PM MDT Tue Sep 19 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...

* TIMING...Snow showers and isolated thunderstorms will continue
  across the Absaroka mountains. Periods of wet snow will bring
  accumulations of 3 to 10 inches above 8500 feet with snow
  accumulations of 2 to 5 inches from 7500 to 8500 feet. Snowfall
  will taper off by 9 pm mdt this evening. Strong gusty west winds
  are also expected on the passes and higher ridges.

* NEW SNOWFALL...1 to 4 inches in locally heavy snow showers.

* MAIN IMPACT...Snow and wind may make travel difficult above
  8500 feet.

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

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.

&&

$$

WYZ012-200300-
/O.CON.KRIW.WW.Y.0031.000000T0000Z-170920T0300Z/
Teton and Gros Ventre Mountains-
234 PM MDT Tue Sep 19 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...

* TIMING...Snow showers and isolated thunderstorms will continue
  across the Teton and Gros Ventre mountains into this evening.
  Periods of wet snow will bring accumulations of 4 to 10 inches
  above 8500 feet with snow accumulations of 2 to 5 inches from
  7500 to 8500 feet. Snowfall will taper off by 9 pm mdt this
  evening. Strong gusty west winds are also expected on the passes
  and higher ridges.

* NEW SNOWFALL...1 to 4 inches in locally heavy snow showers.

* MAIN IMPACT...Snow and wind may make travel difficult above
  8500 feet.

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

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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