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

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WWUS45 KRIW 210928
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
228 AM MST Tue Feb 21 2017

...Heavy snow will continue to fall over the western mountains
through tonight...

.Southwest flow aloft with a deep moisture plume will continue to
produce periods of moderate to heavy snow with strong winds at
ridge top and pass level. Prolonged periods of 2 inch an hour
snowfall is expected. Valleys will stay warm enough for mainly
rain or a rain/snow mix until this evening, when temperatures
cool as a cold front quickly moves through the area. Precipitation
will then change over to snow through the overnight hours
tonight. Some light snow will continue with low accumulations
Wednesday and Wednesday night with much colder temperatures.

WYZ001-212300-
/O.CON.KRIW.WS.W.0008.000000T0000Z-170222T1200Z/
Yellowstone National Park-
Including the cities of Lake, Mammoth, and Old Faithful
228 AM MST Tue Feb 21 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST
WEDNESDAY...

* Timing...Snow and windy areas will continue over Yellowstone
  National Park and continue through tonight.

* Snowfall accumulation...3 to 6 inches in the Mammoth and Tower
  Junction areas. Otherwise 15 to 25 inches of snow are
  expected, with localized amounts up to 30 inches over
  southwest portions of the park.

* Wind and Visibility...West to southwest winds of 20 to 30 mph
  with gusts to 45 mph. Visibility frequently below a quarter
  mile in heavy snow and blowing snow.

* Main Impact...The severely reduced visibility in snow and
  blowing snow can be very disorientating at time for those
  recreating across Yellowstone.

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.

&&

$$

WYZ002-212300-
/O.CON.KRIW.WS.W.0008.000000T0000Z-170222T1200Z/
Absaroka Mountains-
228 AM MST Tue Feb 21 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST
WEDNESDAY...

* Timing...Snow and strong winds will continue through tonight.


* Snowfall accumulation...Snowfall of 10 to 20 inches.

* Wind and Visibility...West to southwest winds of 25 to 35 mph
  with gusts to 60 mph, especially on mountain passes and upper
  ridges. Visibility will be near zero at times in heavy snow
  and blowing snow.

* Main Impact...Travel may become very difficult with the wind
  and snow producing slick, snow-packed roads and high drifts.

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.

&&

$$

WYZ012-024-212300-
/O.CON.KRIW.WS.W.0008.000000T0000Z-170222T1200Z/
Teton and Gros Ventre Mountains-Salt River and Wyoming Ranges-
228 AM MST Tue Feb 21 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST
WEDNESDAY...

* Timing...Snow and areas of strong wind will occur through
  tonight.

* Snowfall Accumulation...15 to 25 inches are expected, with
  amounts up to 30 inches in the Teton mountains.

* Wind and Visibility...West to southwest winds of 25 to 35 mph
  with gusts to 60 mph...especially in open areas or mountain
  summits. Visibility frequently below a quarter mile in heavy
  snow and blowing snow.

* Main Impact...Travel will become very difficult with the wind
  and snow producing slick, snow-packed roads along with high
  drifts over mountain passes. Please monitor JHAVALANCHE.ORG if
  your plans include travel into the backcountry. Also, the
  severely reduced visibility will be very disorientating for
  those recreating in the backcountry.

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.

&&

$$

WYZ014-015-212300-
/O.CON.KRIW.WS.W.0008.000000T0000Z-170222T1200Z/
Wind River Mountains West-Wind River Mountains East-
228 AM MST Tue Feb 21 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST
WEDNESDAY...

* Timing...Snow and strong winds will continue through tonight.

* Snowfall Accumulation...8 to 16 inches over South Pass. 12 to
  24 inches over the rest of the Wind River Mountains with the
  highest amounts over the western slopes.

* Wind and Visibility...West to southwest winds of 25 to 35 mph
  with gusts to 45 mph, gusts to 65 mph on South Pass.
  Visibility frequently below a quarter mile in heavy snow and
  blowing snow.

* Main Impact...Travel may become very difficult or impossible
  across South Pass due to the wind and snow producing slick,
  snow-packed roads along with high drifts.

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.

&&

$$



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