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Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Riverton WY
307 AM MDT Sat May 26 2018

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 AM MDT Sat May 26 2018

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight

Isolated to scattered afternoon and evening thunderstorms mainly in
western Wyoming. Isolated storms may be strong to severe across
Grand Teton and Yellowstone National Park.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Sunday and Monday...Scattered showers and thunderstorms developing
over most of the area. Locally heavy rain may elevate the flood
threat along rivers and creeks already running high from snowmelt.
Isolated strong to severe thunderstorms are possible on Sunday in
central Wyoming, especially Johnson County.

Tuesday...Isolated to scattered showers and thunderstorms across
the area.

Wednesday through Friday...Isolated to scattered showers and
thunderstorms mainly in the north and west.


Spotters are urged to report hail, wind gusts past 45 mph and any
flooding. Thank you.


Hydrologic Outlook

Hydrologic Outlook
Hydrologic Outlook
National Weather Service Riverton WY
946 AM MDT Fri May 25 2018

...A combination of snowmelt and rainfall runoff will cause sharp increases
in creek and river levels Sunday through Tuesday...

...Creeks and streams will remain at high levels through late next week...

Increased snowmelt at the 9,000 to 10,000 foot elevation through
Saturday will be followed by widespread mountain rain showers on Sunday.
At this time, precipitation totals look to the highest across the Big
Horn Mountains.

The combination of rain and snowmelt runoff will further
increase already high creek and river levels. The Wind River and the
North/South Forks of the Shoshone River should see the highest flows of the
runoff season by Monday and Tuesday of next week. Tributary streams that
feed into the Big Horn, Powder, and Snake Rivers may also see the highest
flows of the season by early next week.

Flooding is expected along the Wind River, South Fork of the Shoshone
River, and the Gros Ventre River.  Tributaries creeks and streams along both
sides of the Big Horn Mountains should also have very high river levels to
cause flooding.

Mountain temperatures will remain above normal through the remainder
of next week.  This will cause creeks streams to remain at high
levels through late next week.

During active snowmelt runoff, mountain creeks and streams are
at their highest levels during the late afternoon/early evening
hours.  Crossing creeks and streams during that time is highly

Stay tuned for any watches and/or warnings that will be issued with
this rain on snowmelt event.

Graphical forecasts are available at:
Visit and select the rivers & lakes tab for
graphical forecasts and additional information.


Flood Advisory

Flood Advisory
National Weather Service Riverton WY
909 AM MDT FRI MAY 25 2018

909 AM MDT FRI MAY 25 2018


Minor flooding of low lying areas along the Wind River from Dunoir
Valley downstream to the Black Bridge area near Riverton will
continue through Saturday morning.

At 830 am, the Wind River near Dubois was near 5.0 feet. The river
is expected rise and fluctuate near the minor flood stage of 5.1 to
5.2 feet by early Saturday morning. Minor flooding of low lying
areas in and around Dubois usually occurs at river levels of 5.0

At 830 am, the Wind River at Riverton was fluctuating around 8.4
feet. The river is expected to rise and fluctuate near minor flood
stage of 9.0 feet by late Friday night/early saturday morning.
Minor flooding of low lying areas near the Black Bridge area usually
occurs at river stages of 9.0 feet.

Much warmer mountain temperatures Friday and Saturday followed by
scattered mountain rain showers on Sunday should cause even sharper
rises along the Wind River for the Memorial Day weekend. This
advisory will most likely be upgraded to a Flood Warning with the
expected much higher river flows.


A Flood Advisory means river or stream flows are elevated, and minor
flooding of low lying areas is occurring or is imminent.

Please report flooding to your local law enforcement agency when you
can do so safely.

LAT...LON 4346 10946 4343 10943 4343 10939 4344 10934
      4341 10930 4336 10924 4334 10921 4334 10917
      4328 10909 4326 10904 4323 10895 4323 10891
      4322 10888 4321 10884 4318 10875 4311 10868
      4309 10863 4309 10861 4307 10857 4303 10851
      4303 10847 4302 10841 4302 10837 4306 10834
      4304 10833 4303 10833 4300 10836 4300 10843
      4301 10848 4301 10852 4304 10857 4306 10859
      4306 10862 4307 10863 4308 10866 4308 10869
      4310 10872 4317 10879 4321 10891 4321 10897
      4325 10907 4332 10919 4333 10923 4336 10927
      4338 10931 4341 10935 4342 10936 4341 10938
      4341 10945 4343 10946 4345 10950 4347 10952
      4349 10953 4350 10957 4353 10967 4355 10972
      4356 10976 4359 10975 4358 10974 4357 10969
      4353 10963 4352 10956 4351 10952



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