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

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739
WWUS45 KRIW 202015
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
115 PM MST Mon Feb 20 2017

...A strong Pacific storm will bring heavy snow to the western
mountains from this Afternoon through Tuesday night...

.Southwest flow aloft with a deep pineapple connection moisture
plume entering western Wyoming 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.
Temperatures will cool Tuesday night with a gradual decrease in
snowfall into Wednesday morning. Winter storm warning will remain
in effect until early wednesday morning. Tetons still look good
for a 30 inch snowfall while the rest of the western mountains
should be in the 15 to 25 inch range. Valleys still look warm
enough for mainly rain to rain snow mix until Tuesday evening when
temperatures cool and precipitation should change over to snow
for the last 12 hours of the storm. Some light snow will continue
with low accumulations Wednesday and Wednesday night with much
colder temperatures.

WYZ001-211000-
/O.CON.KRIW.WS.W.0008.000000T0000Z-170222T1200Z/
Yellowstone National Park-
Including the cities of Lake, Mammoth, and Old Faithful
115 PM MST Mon Feb 20 2017

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

* Timing...Snow and strong winds are expected to move over the
  Yellowstone National Park and continue through Tuesday night.


* 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 portion
  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.

&&

$$

WYZ002-211000-
/O.CON.KRIW.WS.W.0008.000000T0000Z-170222T1200Z/
Absaroka Mountains-
115 PM MST Mon Feb 20 2017

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

* Timing...Snow and strong winds are expected to develop this
  afternoon, and remain through Tuesday Night.

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

* 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.

&&

$$

WYZ012-024-211000-
/O.CON.KRIW.WS.W.0008.000000T0000Z-170222T1200Z/
Teton and Gros Ventre Mountains-Salt River and Wyoming Ranges-
115 PM MST Mon Feb 20 2017

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

* Timing...Snow and strong winds have moved into the Teton and
  Gros Ventre mountains of Wyoming. Snow and wind are expected to
  continue through Tuesday night.

* 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.

&&

$$

WYZ014-015-211000-
/O.CON.KRIW.WS.W.0008.000000T0000Z-170222T1200Z/
Wind River Mountains West-Wind River Mountains East-
115 PM MST Mon Feb 20 2017

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

* Timing...Snow and strong winds have moved into the Wind River
  mountains of Wyoming. Snow and wind are expected to continue
 through Tuesday night.

* 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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