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2 products issued by NWS for: Powell WY
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Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Riverton WY
307 PM 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-
307 PM MDT Sun May 31 2020

.DAY ONE...This Afternoon and Tonight

Outflow wind with gusts of 40 to 50 mph will be possible with any
showers or thunderstorms through early evening. The showers and
storms will generally occur east of a line from Rock Springs to
Lander to Greybull. Above normal temperatures will continue an
active snow melt cycle in the western mountains which will keep
some western waterways near bankfull.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

Monday...Elevated fire weather conditions are likely across
southwest and central Wyoming as it will be very warm, dry, and
windy. The warm temperatures will keep melting mountain snow
resulting in high water levels on western waterways.

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.


Hydrologic Outlook

Hydrologic Outlook

Hydrologic Outlook
National Weather Service Riverton WY
720 PM MDT Sun May 31 2020

...Higher Water Levels to continue this 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. 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 Monday
east of the Divide and an active snowmelt will continue all week.

Conditions will be mostly dry Monday with only isolated showers
and thunderstorms expected. 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 around flood stage around Dubois while
near bankfull downstream through Kinnear 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.


Team Riverton/21

U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
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