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

Hazardous Weather Outlook
National Weather Service Riverton WY
245 PM MDT Fri May 29 2020

WYZ001>020-022>030-300800-
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-
245 PM MDT Fri May 29 2020

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight.

Isolated strong thunderstorms possible, mainly in northern
Wyoming.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Saturday...Widely scattered afternoon and evening thunderstorms.
Strong to possibly severe thunderstorms are possible generally
across the Bighorn Basin, Johnson and Natrona counties by late
afternoon.

Sunday...Elevated fire behavior possible in portions of the area
in the afternoon.

Monday...Showers and thunderstorms possible over far southern
portions late in the afternoon into the evening.

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

Wednesday...Scattered afternoon showers and thunderstorms west of
the Divide. Showers east of the Divide through the overnight
hours.

This weekend into next week...Unseasonably warm temperatures will
result in rapid mountain snowmelt. Significant rises are expected
on area creeks and rivers where ample snow remains in the
headwaters.

.SPOTTER INFORMATION STATEMENT...

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


$$



Hydrologic Outlook

Hydrologic Outlook
WYC003-013-023-029-035-039-043-302200-

Hydrologic Outlook
National Weather Service Riverton WY
212 PM MDT Fri May 29 2020

...Much higher flows along creeks and small streams will occur
this weekend into next week due to the expected near record high
temperatures...

Snowpack at the 8,000 to 10,000 foot elevation is ripe (water
laden), and will be melting quickly this weekend into next week. There
could also be showers and thunderstorms at times especially on
Saturday.

The greatest concern will be across western Wyoming where copious
amounts of snow remain in the headwaters of area creeks and rivers.
The river stage at Pacific Creek increased to 7.5 feet Thursday
night. Action stage is 7 feet. The river stage is forecast to
rise to near bankfull or 8 feet by Monday. The Gros ventre Creek
at Kelly is presently at the action stage of 7 feet. The Green
River at La Barge is forecast to reach the action stage of 8 feet
by the middle of next week.

Other areas of concern include the Wind River at Dubois where the
river level is expected to come close to the action stage of 4.5
feet by Tuesday. The river stage along the Medicine Lodge Creek
at Hyattville has reached near the action stage of 3.5 feet.

Remember, during active snowmelt runoff, mountain creeks flow the
highest during evening and overnight hours, through the early
morning. Do not attempt to cross a fast moving creek or stream at
these times as the power of water will easily carry you downstream.

$$

TEAM RIVERTON



U.S. Dept. of Commerce
NOAA National Weather Service
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Silver Spring, MD 20910
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