A moist and unstable airmass and an upper level disturbance brought a third straight day of thunderstorms to western and central Wyoming. The strongest thunderstorm formed over the Absaroka Range and become severe as it moved east across the Big Horn Basin and into Johnson County. There were numerous reports of large hail in a swath from near Barnum to Midwest with the largest stones being ping pong ball sized in Midwest. The storm also brought wind gusts up to 60 mph. In addition, a wind gust from a collapsing thunderstorm in Sublette County produced a 59 mph wind gust at the Big Piney Airport.

Thunderstorm Wind in HOT SPRINGS, WYOMING
From 05-JUL-13 15:15:00 to 05-JUL-13 15:15:00 (MST-7)
Location: KIRBY
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Hot Springs County emergency manager reported a 60 mph wind gust at Kirby.

Hail in NATRONA, WYOMING
From 05-JUL-13 18:05:00 to 05-JUL-13 18:10:00 (MST-7)
Location: MIDWEST
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters reported quarter sized hail from Midwest to Edgerton.

Thunderstorm Wind in NATRONA, WYOMING
From 05-JUL-13 18:05:00 to 05-JUL-13 18:10:00 (MST-7)
Location: MIDWEST
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts of 60 mph were estimated by a trained spotter in Midwest. The wind blew down one wall of a wooden garage in town.

Hail in NATRONA, WYOMING
From 05-JUL-13 17:40:00 to 05-JUL-13 17:45:00 (MST-7)
Location: MIDWEST
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters reported one inch diameter hail.

Thunderstorm Wind in NATRONA, WYOMING
From 05-JUL-13 17:23:00 to 05-JUL-13 17:33:00 (MST-7)
Location: MERINO
Magnitude: 70.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Public

Five large cottonwood trees were toppled and limbs up to one foot in diameter were ripped to the ground by wind gusts estimated up to 80 mph. At a ranch along West Willow Creek Road, one large feeding shed was gradually torn apart by the wind while another was rolled.

Flash Flood in JOHNSON, WYOMING
From 05-JUL-13 17:20:00 to 05-JUL-13 19:00:00 (MST-7)
Location: KAYCEE
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Public

Heavy rainfall estimated by radar to be 1 to 1.5 inches in less than 30 minutes inundated areas south of Barnum and into northern Natrona County. Blue Creek was flooded as were Poker Creek and some smaller streams feeding the Middle Fork of the Powder River. Several corrals were lost and damage was done to at least one out-building. One observer said it was the worst flooding they had seen in 27 years at their residence. Bar C Gap ran 6 to 7 feet deep and Bar C Ranch Road was covered with mud and debris.
Another hard hit area centered on Willow Creek and nearby drainages along the TTT-Lone Bear Road and West Willow Creek Road. Water was running over the roads in more than one location.

Thunderstorm Wind in WASHAKIE, WYOMING
From 05-JUL-13 14:55:00 to 05-JUL-13 15:10:00 (MST-7)
Location: DURKEE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 1.00M
Reported by: Newspaper

Wind gusts estimated at 60 mph combined with one-half inch diameter hail to devastate barley and corn fields in northern Washakie County. There were a few cottonwood trees downed by the wind, one of which fell across State Highway 433. The same thunderstorm caused one irrigation ditch to fill quickly and produce minor flooding of a nearby road.

Hail in HOT SPRINGS, WYOMING
From 05-JUL-13 15:18:00 to 05-JUL-13 15:22:00 (MST-7)
Location: KIRBY
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Penny to nickel sized hail was reported in Kirby.

Hail in JOHNSON, WYOMING
From 05-JUL-13 17:06:00 to 05-JUL-13 17:09:00 (MST-7)
Location: BARNUM
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Penny sized hail was reported at a ranch south of Barnum.

Thunderstorm Wind in NATRONA, WYOMING
From 05-JUL-13 17:40:00 to 05-JUL-13 17:45:00 (MST-7)
Location: MIDWEST
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated at 60 mph broke seven-inch diameter branches from trees. A combination of the wind and quarter sized hail stripped leaves from some smaller trees.

Hail in NATRONA, WYOMING
From 05-JUL-13 18:05:00 to 05-JUL-13 18:05:00 (MST-7)
Location: MIDWEST
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported ping pong ball sized hail in Midwest.

Thunderstorm Wind in SUBLETTE, WYOMING
From 05-JUL-13 19:18:00 to 05-JUL-13 19:18:00 (MST-7)
Location: (BPI)BIG PINEY ARPT
Magnitude: 51.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The ASOS at Big Piney-Marbleton Airport recorded an outflow thunderstorm wind gust from the northwest that measured 59 mph.

Thunderstorm Wind in JOHNSON, WYOMING
From 05-JUL-13 17:03:00 to 05-JUL-13 17:12:00 (MST-7)
Location: BARNUM
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts estimated at 75 to 80 mph blew down several trees along the Bar C Ranch Road from Barnum to the Bar C Ranch.

Hail in PARK, WYOMING
From 05-JUL-13 14:15:00 to 05-JUL-13 14:15:00 (MST-7)
Location: PITCHFORK
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Nickel sized hail was reported near Sunshine Reservoir.