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2 products issued by NWS for: Yellowstone National Park WY
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Winter Weather Advisory

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
222 PM MDT Wed Sep 20 2017

...A New Storm System Will Take Aim On Western Wyoming Tonight Into
At Least Friday...

.The large, cold, and wet pacific Pacific storm will move quickly
into much of Western Wyoming this evening and continue to affect
western and northwestern Wyoming through Friday. Isolated snow
showers this afternoon will increase to to numerous across the
western and northwestern mountains this evening. Heavier snowfall is
across the Teton, Gros Ventre, and Wind River Mountains above 8500
feet where from 8 to 20 inches of snow can be expected through noon
Friday.

WYZ001-002-211200-
/O.CON.KRIW.WW.Y.0032.170921T0300Z-170922T1800Z/
Yellowstone National Park-Absaroka Mountains-
Including the cities of Lake, Mammoth, and Old Faithful
222 PM MDT Wed Sep 20 2017

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

* TIMING...A few isolated snow showers this afternoon will give way
  to moderate snow tonight over Yellowstone and the Absaroka
  mountains... continuing through Friday morning. Total snowfall
  will range from 6 to 12 inches above 8500 feet with snow
  accumulations of 3 to 6 inches from 7500 to 8500 feet.

* SNOWFALL...6 to 12 inches above 8500 feet with 3 to 6 inches down
  to 7500 feet.

* MAIN IMPACT...Moderate to occasionally heavy snow will make travel
  difficult at times.

* 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



Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Riverton WY
151 AM MDT Wed Sep 20 2017

WYZ001>020-022>030-211200-
Yellowstone National Park-Absaroka Mountains-Cody Foothills-
North Big Horn Basin-Southwest Big Horn Basin-
Southeast Big Horn Basin-Owl Creek and Bridger Mountains-
Bighorn Mountains West-Bighorn Mountains Southeast-
Northeast Johnson County-Southeast Johnson County-
Teton and Gros Ventre Mountains-Jackson Hole-
Wind River Mountains West-Wind River Mountains East-
Upper Wind River Basin-Wind River Basin-Lander Foothills-
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-Casper Mountain-Star Valley-
Salt River and Wyoming Ranges-Upper Green River Basin Foothills-
Upper Green River Basin-South Lincoln County-
Rock Springs and Green River-Flaming Gorge-East Sweetwater County-
151 AM MDT Wed Sep 20 2017

...WINTER STORM WARNING FOR THE WIND RIVER, TETON AND GROS VENTRE
MOUNTAINS TONIGHT THROUGH FRIDAY MORNING...

...WINTER WEATHER ADVISORY TONIGHT THROUGH FRIDAY MORNING FOR THE
NORTHERN AND WESTERN MOUNTAINS...

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight

Unsettled with a good chance of increasing mountain snowfall
tonight down to 6500 feet. Significant mountain snowfall expected
across the western, northwestern mountains. Please see the winter
weather statement for more details.

Windy across most of the forecast area with gusts as high as 45
mph over the lower elevations...55 or more mph across the higher
ridges and passes in the central and northern mountains.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Thursday through Friday...Significant mountain snowfall continues
over the western central and northern mountains. Rain may change
to snow in the Cody Foothills early Friday.

Friday night through Sunday night...Widespread mountain snowfall
and valley rain at times especially along and east of the Divide.
Snow could lower to valley floors at a few locations east of the
Divide.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report snowfall amounts. Thank you!

$$



U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: May 16, 2007
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