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Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Riverton WY
255 AM MDT Sun May 31 2020

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-
255 AM MDT Sun May 31 2020

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight.

Elevated fire weather conditions will occur across southwest and
central Wyoming. Unseasonably warm temperatures will result in
rapid mountain snowmelt.

Isolated thunderstorms possible generally east of a Rock Springs
to Buffalo line.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Monday...Elevated fire behavior possible in portions of the area
in the afternoon. Unseasonably warm temperatures will result in
rapid mountain snowmelt.

Tuesday...Showers and thunderstorms possible over northern
portions late in the afternoon into the evening.

Wednesday...Isolated afternoon and evening showers and
thunderstorms over far southern portions.

Thursday...Scattered afternoon and evening showers and
thunderstorms over central and northern portions.


Weather spotters are encouraged to report significant weather
conditions, according to standard operating procedures.


Special Weather Statement

Special Weather Statement
National Weather Service Riverton WY
118 PM MDT Sun May 31 2020

Wind River Basin-Lander Foothills-
Including the cities of Riverton, Shoshoni, and Lander
118 PM MDT Sun May 31 2020

...Strong Wind Gusts Possible Sunday Afternoon...

Isolated showers and thunderstorms, some of which will be decaying
over the Wind River Range, will be capable of producing gusty
outflow wind Sunday afternoon.

* WHAT...Outflow wind gusts of 40 to 55 mph with a few foothill
  locations seeing gusts around 60 mph.

* WHERE...The east slope and the foothills of the Wind River
  Range and the adjacent valleys. This includes communities from
  Fort Washakie to Lander to Red Canyon. Hudson and Ethete could
  also be impacted.

* WHEN...Until Sunday 5 PM MDT.

* ADDITIONAL DETAILS...Any shower or storm, even one that is
  weakening, will be capable of producing these winds. Be prepared
  for strong crosswinds if you plan to drive US Highway 287 or
  Wyoming Highway 28 in this region.


Hydrologic Outlook

Hydrologic Outlook

Hydrologic Outlook
National Weather Service Riverton WY
1144 AM MDT Sun May 31 2020

...Higher Water Levels to Continue Into Next Week...

Snow in the far western Wyoming mountains between the 8,000 and
10,000 foot elevation will continue to melt during the coming
week. Sunday and Monday will remain quite warm before temperatures
cool slightly through the week. However, even these cooler
readings will be above normal for early June. East of the
Continental Divide, the remaining snow is mainly confined to
elevations above 9,000 feet. Much above normal temperatures will
continue Sunday and Monday east of the Divide and an active
snowmelt will continue all week.

Conditions will be mostly dry Sunday and Monday with only isolated
showers and thunderstorms expected. Therefore, rain falling on
the snowpack does not pose a significant problem. The far northern
mountains have a better chance of rain showers Tuesday afternoon
and evening. The showers and thunderstorms will become more
widespread from Thursday afternoon into next weekend.

The greatest concern for minor flooding remains across western
Wyoming where the best snowpack persists. The river stages at both
Pacific Creek near Moran and the Gros Ventre River at Kelly will
generally remain bankfull. The Green River at La Barge is forecast
to climb to near action stage of 8.0 feet by Wednesday.

Other areas of concern include the upper Wind River from Dubois to
Kinnear. The river will be bankfull around Dubois and downstream
along portions of this stretch of river through midweek. Creeks
and streams along the west slope of the Bighorn Range, including
Tensleep Creek, Medicine Lodge Creek, and Paintrock Creek may run
bankfull at times through Monday. Rainfall Saturday evening caused
water levels to rise on these foothill creeks.

Remember, during active snowmelt runoff, mountain and foothill
creeks flow highest from late evening through early morning.
Recreationists should stay away from these cold, fast-moving
streams and avoid camping near any waterway. Do not attempt to
cross a creek or stream on foot as the power of the water will
easily carry you downstream.


U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
Page last modified: May 16, 2007
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