Severe Thunderstorm Warning 39, NWS Riverton, WY

189 
WWUS55 KRIW 070113
SVSRIW

Severe Weather Statement
National Weather Service Riverton WY
713 PM MDT WED JUN 6 2018

WYC017-043-070130-
/O.CON.KRIW.SV.W.0039.000000T0000Z-180607T0130Z/
Hot Springs-Washakie-
713 PM MDT WED JUN 6 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM MDT
FOR EAST CENTRAL HOT SPRINGS AND WEST CENTRAL WASHAKIE COUNTIES...

At 713 PM MDT, a severe thunderstorm was located near Kirby, or 10
miles north of Thermopolis, moving north at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

This severe thunderstorm will remain over mainly rural areas of east
central Hot Springs and west central Washakie Counties, including the
following locations... Hot Springs County Fairgrounds, Hot Sprgs
County Thermopolis Airport and Legion Town And Country Golf Course.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4363 10817 4371 10831 4394 10832 4393 10807
      4393 10788 4363 10801
TIME...MOT...LOC 0113Z 176DEG 31KT 4380 10826 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

Bourque

525 
WWUS55 KRIW 070125
SVSRIW

Severe Weather Statement
National Weather Service Riverton WY
725 PM MDT WED JUN 6 2018

WYC017-043-070135-
/O.EXP.KRIW.SV.W.0039.000000T0000Z-180607T0130Z/
Hot Springs-Washakie-
725 PM MDT WED JUN 6 2018

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL HOT SPRINGS AND
WEST CENTRAL WASHAKIE COUNTIES WILL EXPIRE AT 730 PM MDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

LAT...LON 4363 10817 4371 10831 4394 10832 4393 10807
      4393 10788 4363 10801
TIME...MOT...LOC 0125Z 176DEG 31KT 4389 10827 

$$

Bourque

Area Forecast Discussion
National Weather Service Riverton WY
140 PM MDT Wed Jun 6 2018

.SHORT TERM...(This evening through Saturday) Issued at 1250 PM
MDT Wed Jun 6 2018

The cold front snuck through areas east of the divide overnight
while everyone was sleeping without any fanfair. What this front
did was lay down the ground work for potentially strong
thunderstorm activity with a potent sfc based moisture field. Sfc
dew points are in the mid and upper 50s across much of the area
east of the divide. The first shortwave we will experience across
the CWA today that was over SLC this morning is already producing
lightning along the Teton/Sublette County line. However, dew
points are in the upper 20s and 30s west of the divide where
capes will be lower. This shortwave should arrive east of the
divide between 22Z and 23Z this afternoon where it will bisect the
front as it enters the slight risk area over Central Wyoming east
of the divide where the juicier dew points are in place. Capes
will be as high as 2500 to 3000 across this area where large hail
and damaging winds are a strong possibility in some areas. The
shortwave to follow that was over Southern utah earlier today
will be arriving in Central Wyoming around 03Z this evening. This
shortwave has cooler air aloft asct with it. Therefore, the
strongest thunderstorm activity for the day will likely occur
early this evening, east of the divide. Even areas like Casper
that earlier had a broken deck of post frontal stratocu cleared
out by 11 am this morning. So this area will likely have the
toughest time breaking the cap this afternoon,.so it appears that
areas of Central Wyoming west of the Casper Arch and the Big Horn
Mtns stand the best chance of seeing any thunderstorms that become
potentially severe as the cap is weaker there, yet dew points are
fairly high. Wind directional shear is expected given the low
level south/southeast winds but the wind speed will be lacking so
the tornado threat is fairly minimal. T storms should persist
after midnight tonight as this last shortwave tracks across our
northeast zones.

On Thursday, our northern zones will be under a slight risk as the
area of ample mstr/instability/"ring of fire" shifts northeast as
does the sfc front with the added element of the dry line moving
in from the southwest. Otherwise, hot and dry weather will become
established as the upper high over the South central United States
begins to build in from the south. For the rest of the week,
Friday and Saturday, the weather will trend toward warm to hot
and dry with the min RH 10 to 15 percent across the zones across
the south half of the CWA. Many areas east of the divide should
reach the low 90s by Saturday along with a gradual increase in
southwesterly breezes.

.LONG TERM...(Saturday night through Wednesday) Issued at 1250 PM
MDT Wed Jun 6 2018

Hot and windy to start this period with elevated fire weather
threat with very low rh's, very warm temps and very low rh's.
Negatively tilted trough clips the nwrn corner on Sunday with risk
of some stronger tstms. Cold front swings across on Sunday with
strong sw wind ahead of it and w through n behind it. Front will
be dry for most of the area except the far north. Monday will be
not as warm but still quite dry and windy with continued elevated
fire weather threat. Generally dry wly flow Tuesday through
Wednesday with mild temps. Some model differences show up by the
end on whether another disturbance approaches from the w/nw or
maybe even some moisture around the periphery of the over the srn
high plains but will keep a generally dry and warm forecast going.

&&

.AVIATION...(For the 00Z TAFS through 00Z Thursday evening) Issued
at 1250 PM MDT Wed Jun 6 2018

Widely scattered to scattered thunderstorms are expected through
this evening, some of which may be quite strong to severe (with
large hail potential and 60 mph or greater wind gusts). The
strongest storms will be east of the divide. Most of this activity
should be east of the area by 06z Thursday. Some MVFR ceilings
and patchy fog may develop east of the Divide, especially along
and east of Interstate 25 as skies clear early Thursday morning.
Thursday will be much drier with only isolated thunderstorms
possible across the north. A strong storm is possible in northern
Johnson County Thu afternoon.

&&

.FIRE WEATHER...
Issued AT 1250 PM MDT Wed Jun 6 2018

A weather system will cross the area today and bring late afternoon
and evening showers and thunderstorm, mainly to the northern half
of the state. Some storms could become strong to severe with
large hail and damaging winds, especially in the Big Horn Basin
and Johnson County. Relative humidity will fall under 15 percent
in southern Wyoming, but remain above critical levels elsewhere.
The minimum relative humidity will be down around 10 to 15
percent Thursday in the southern zones. Mixing and smoke
dispersal will range from fair in some of the basins to excellent
in southeastern Sweetwater County.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

SHORT TERM...Lipson
LONG TERM...Skrbac
AVIATION...Skrbac
FIRE WEATHER...Lipson

Hazardous Weather Outlook
National Weather Service Riverton WY
121 AM MDT Wed Jun 6 2018

WYZ001>020-022>030-071200-
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-
121 AM MDT Wed Jun 6 2018

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight

Isolated to scattered afternoon and evening thunderstorms. Some
storms will likely become severe in northern and eastern areas
with large hail and damaging winds the main threat. The main areas
of concern will be the Big Horn Basin, Johnson County and northern
Fremont County.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Thursday...Isolated to widely scattered thunderstorms over
northern areas. A few strong thunderstorms possible mainly over
the northern Big Horn Basin and Johnson County.

Friday...Isolated afternoon and evening thunderstorms mainly over
the north.

.SPOTTER INFORMATION STATEMENT...

Spotters are urged to report wind gusts over 45 mph and hail.
Thank you.

TEAM RIVERTON

Special Weather Statement
National Weather Service Riverton WY
539 PM MDT WED JUN 6 2018

WYZ001-012-013-070015-
Yellowstone National Park-Jackson Hole-Teton and Gros Ventre
Mountains-
539 PM MDT WED JUN 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL TETON COUNTY UNTIL 615 PM
MDT...

At 537 PM MDT, Doppler radar was tracking a strong thunderstorm 7
miles southeast of South Entrance, moving northeast at 30 mph. Other
thunderstorms were located to the south across Grand Teton National
Park, also moving northeast.

Pea-sized to one-half inch diameter hail, winds around 40 mph, and
dangerous lightning will be possible with these storms.

This strong thunderstorm will be near...
  South Entrance around 545 PM MDT.
  Heart Lake around 610 PM MDT.
  South Arm Of Lake Yellowstone around 615 PM MDT.

Other locations impacted by this storm include Jackson Lake, Flagg
Ranch Village, and Colter Bay.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If on or near Jackson Lake, get out of the water and move indoors or
inside a vehicle. 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 4367 11033 4372 11093 4447 11094 4449 11019
TIME...MOT...LOC 2337Z 206DEG 25KT 4404 11060

CNJ

Special Weather Statement
National Weather Service Riverton WY
550 PM MDT WED JUN 6 2018

WYZ004-070030-
North Big Horn Basin-
550 PM MDT WED JUN 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN BIG HORN COUNTY
UNTIL 630 PM MDT...

At 549 PM MDT, Doppler radar was tracking a strong thunderstorm near
Otto, or 10 miles west of Basin, moving northeast at 45 mph.

Dime size hail and wind gusts to around 50 mph will be possible with
this storm.

This strong thunderstorm will be near...
  Basin around 605 PM MDT.
  Greybull around 610 PM MDT.
  Shell around 625 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4464 10781 4417 10767 4417 10852 4443 10852
TIME...MOT...LOC 2349Z 244DEG 38KT 4434 10825

CNJ

Special Weather Statement
National Weather Service Riverton WY
621 PM MDT WED JUN 6 2018

WYZ006-008-070045-
Southeast Big Horn Basin-Bighorn Mountains West-
621 PM MDT WED JUN 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN WASHAKIE COUNTY
UNTIL 645 PM MDT...

At 621 PM MDT, Doppler radar was tracking a strong thunderstorm near
Ten Sleep. This storm was nearly stationary.

Dime size hail will be possible with this storm.

This strong thunderstorm will be near...
  Ten Sleep around 635 PM MDT.
  Tensleep Canyon around 645 PM MDT.

Other locations impacted by this storm include Wigwam Fish Rearing
Station and Leigh Creek Campground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4390 10737 4401 10750 4415 10738 4396 10716
TIME...MOT...LOC 0021Z 231DEG 3KT 4399 10742

Meunier

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
624 PM MDT WED JUN 6 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0600 PM     HAIL             6 WNW BUFFALO           44.38N 106.82W
06/06/2018  E0.75 INCH       JOHNSON            WY   TRAINED SPOTTER

&&

DAL

Special Weather Statement
National Weather Service Riverton WY
634 PM MDT WED JUN 6 2018

WYZ009>011-070115-
Southeast Johnson County-Bighorn Mountains Southeast-Northeast
Johnson County-
634 PM MDT WED JUN 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL JOHNSON COUNTY
UNTIL 715 PM MDT...

At 633 PM MDT, Doppler radar was tracking a strong thunderstorm 10
miles south of Buffalo, moving northeast at 20 mph.

Nickel size hail will be possible with this storm.

This strong thunderstorm will be near...
  Buffalo around 710 PM MDT.

Other locations impacted by this storm include Johnson County
Fairgrounds.

This includes the following highways...
 Interstate 25 between mile markers 283 and 299.
 Interstate 90 between mile markers 57 and 75.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4408 10675 4422 10690 4443 10661 4422 10638
TIME...MOT...LOC 0033Z 221DEG 17KT 4420 10678

Meunier

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
644 PM MDT WED JUN 6 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0608 PM     FUNNEL CLOUD     8 ESE THERMOPOLIS       43.60N 108.07W
06/06/2018                   HOT SPRINGS        WY   STORM CHASER

0611 PM     FUNNEL CLOUD     8 ESE THERMOPOLIS       43.60N 108.07W
06/06/2018                   HOT SPRINGS        WY   TRAINED SPOTTER

            SEEN FROM SOUTHEAST HOT SPRINGS COUNTY

0612 PM     FUNNEL CLOUD     8 ESE THERMOPOLIS       43.60N 108.07W
06/06/2018                   HOT SPRINGS        WY   STORM CHASER

&&

GSWANSON