290 
WUUS55 KRIW 202229
SVRRIW
WYC019-202315-
/O.NEW.KRIW.SV.W.0016.260620T2229Z-260620T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Riverton WY
429 PM MDT Sat Jun 20 2026

The National Weather Service in Riverton has issued a

* Severe Thunderstorm Warning for...
  Johnson County in north central Wyoming...

* Until 515 PM MDT.

* At 427 PM MDT, a severe thunderstorm was located 10 miles northeast
  of Mayoworth, which is 17 miles north of Kaycee, moving northeast
  at 45 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* This severe thunderstorm will remain over mainly rural areas of
  Johnson County, including the following locations... South Fork
  Campground, Sussex, Buffalo Johnson County Airport, Lost Cabin
  Campground, and Johnson County Fairgrounds.

This includes the following highways...
 Interstate 25 between mile markers 257 and 299.
 Interstate 90 between mile markers 42 and 95.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4397 10713 4456 10714 4456 10601 4349 10602
TIME...MOT...LOC 2227Z 205DEG 37KT 4396 10668 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH

$$

Rowe

795 
WWUS55 KRIW 202249
SVSRIW

Severe Weather Statement
National Weather Service Riverton WY
449 PM MDT Sat Jun 20 2026

WYC019-202315-
/O.CON.KRIW.SV.W.0016.000000T0000Z-260620T2315Z/
Johnson-
449 PM MDT Sat Jun 20 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM MDT
FOR JOHNSON COUNTY...

At 449 PM MDT, a severe thunderstorm was located 14 miles southeast
of Buffalo, moving northeast at 45 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Buffalo, Powder River Rest Area, Fort Reno Historical Site, Fort Phil
Kearny Historical Site, Saddlestring, Powder River Pass, Lake De
Smet, South Fork Campground, Lost Cabin Campground, Johnson County
Fairgrounds, and Buffalo Johnson County Airport.

This includes the following highways...
 Interstate 25 between mile markers 265 and 299.
 Interstate 90 between mile markers 42 and 95.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4456 10714 4456 10601 4362 10602 4406 10713
TIME...MOT...LOC 2249Z 205DEG 37KT 4417 10655 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH

$$

Rowe