Special Weather Statement, NWS Riverton, WY

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Hazardous Weather Outlook
National Weather Service Riverton WY
330 AM MDT Thu Sep 2 2021

WYZ001>020-022>030-031100-
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-
330 AM MDT Thu Sep 2 2021

This Hazardous Weather Outlook is for Western and Central
Wyoming.

.DAY ONE...Today and Tonight.

A chance of showers and thunderstorms over the region this
afternoon and tonight. Some storms may produce brief heavy rain.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Friday...A chance of showers and storms...mainly along and east
of the continental divide. Elevated fire weather concerns in the
southwest.

Saturday...Elevated fire weather concerns in the southwest and
south.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions.

Special Weather Statement
National Weather Service Riverton WY
1119 AM MDT Thu Sep 2 2021

WYZ012-014-024>026-021800-
Wind River Mountains West-Upper Green River Basin-Upper Green River
Basin Foothills-Teton and Gros Ventre Mountains-Salt River and
Wyoming Ranges-
1119 AM MDT Thu Sep 2 2021

...SPECIAL WEATHER STATEMENT...

At 1117 AM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 11 miles southeast of Kelly to 7 miles
northwest of Calpet. Movement was east at 30 mph.

Half inch hail and winds in excess of 30 mph will be possible with
these storms.  Brief heavy rain and frequent lightning is also
occurring.

Locations impacted include...
Pinedale, Big Piney, Marbleton, Daniel, Cora, Bondurant, Merna,
Calpet, New Fork Lake, Warren Bridge, Willow Lake, Union Pass,
Fremont Lake, Green River Lake Campground, Kozy Campground, Granite
Creek Campground, Pinedale Ralph Wenz Field, Sublette County
Fairgrounds, and Big Piney Marbleton Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Brief heavy rainfall is also occurring with these storms, and may
lead to localized flooding. Do not drive your vehicle through
flooded roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

Persons in campgrounds should consider seeking sturdy shelter until
these storms pass.

&&

LAT...LON 4374 10998 4373 10998 4371 11000 4365 10999
      4357 11002 4354 10995 4347 10995 4349 10990
      4348 10987 4235 10976 4226 11034 4227 11041
      4225 11040 4224 11045 4354 11058
TIME...MOT...LOC 1717Z 249DEG 27KT 4349 11051 4234 11039

McDonald

Special Weather Statement
National Weather Service Riverton WY
127 PM MDT Thu Sep 2 2021

WYZ015>018-022200-
Wind River Mountains East-Upper Wind River Basin-Wind River Basin-
Lander Foothills-
Including the cities of Dubois, Riverton, Shoshoni, and Lander
127 PM MDT Thu Sep 2 2021

...Showers and Thunderstorms Will Create Gusty Outflows...

This is a special weather statement from the National Weather
Service Office in Riverton.

* WHAT...Showers and thunderstorms could create strong to gusty
  outflows through early afternoon.

* WHERE...Wind River Basin.

* WHEN...Through 4 PM this afternoon.

* ADDITIONAL DETAILS...An area of showers and thunderstorms is
  moving into the Wind River Basin. These storms are generating
  frequent cloud-to-ground lightning. Gusty wind of 30 to 40 mph
  along with small hail and brief heavy rain is also possible.

Vorst

Special Weather Statement
National Weather Service Riverton WY
134 PM MDT Thu Sep 2 2021

WYZ016-017-022000-
Wind River Basin-Upper Wind River Basin-
134 PM MDT Thu Sep 2 2021

...A strong thunderstorm will impact portions of central Fremont
County through 200 PM MDT...

At 133 PM MDT, Doppler radar was tracking a strong thunderstorm near
Diversion Dam Rest Area, or 12 miles north of Fort Washakie, moving
east at 45 mph.

HAZARD...Winds in excess of 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

This strong thunderstorm will be near...
  Morton and Pilot Butte Reservoir around 145 PM MDT.
  Pavillion and Kinnear around 150 PM MDT.

Other locations in the path of this storm include Ocean Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Brief torrential rainfall is also occurring with this storm.

If on or near Ocean Lake, get out of the water and move indoors or
inside a vehicle. Remember, lightning can strike out to 10 miles
from the parent thunderstorm. If you can hear thunder, you are close
enough to be struck by lightning. Move to safe shelter now! Do not
be caught on the water in a thunderstorm.

&&

LAT...LON 4310 10913 4328 10908 4327 10846 4295 10857
TIME...MOT...LOC 1933Z 281DEG 40KT 4318 10896

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

Vorst

Special Weather Statement
National Weather Service Riverton WY
221 PM MDT Thu Sep 2 2021

WYZ007-009-017>020-022045-
Owl Creek and Bridger Mountains-Wind River Basin-Bighorn Mountains
Southeast-Green Mountains and Rattlesnake Range-Natrona County Lower
Elevations-Lander Foothills-
221 PM MDT Thu Sep 2 2021

...Strong thunderstorms will impact portions of northwestern Natrona
and southeastern Fremont Counties through 245 PM MDT...

At 220 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 9 miles northwest of Lysite to 8 miles
southeast of Red Canyon. Movement was southeast at 40 mph.

HAZARD...Wind gusts of 50 to 55 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Strong thunderstorms will be near...
  Lysite around 235 PM MDT.
  Lost Cabin around 240 PM MDT.

Other locations in the path of these storms include Sweetwater
Station.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

If on or near Boysen Reservoir, get out of the water and move
indoors or inside a vehicle. Remember, lightning can strike out to
10 miles from the parent thunderstorm. If you can hear thunder, you
are close enough to be struck by lightning. Move to safe shelter
now! Do not be caught on the water in a thunderstorm.

&&

LAT...LON 4332 10716 4229 10795 4272 10863 4340 10807
TIME...MOT...LOC 2020Z 293DEG 36KT 4335 10786 4258 10851

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

Vorst

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