Thunderstorms developed in advance of a strong, compact upper level disturbance.  The storms blossomed in more unstable air east of the Continental Divide and produced damaging wind and hail.

Thunderstorm Wind in FREMONT, WYOMING
From 22-AUG-07 16:35:00 to 22-AUG-07 16:35:00 (MST-7)
Location: LANDER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts on the north side of Lander were estimated at 60 mph.

Thunderstorm Wind in FREMONT, WYOMING
From 22-AUG-07 16:41:00 to 22-AUG-07 16:41:00 (MST-7)
Location: RIVERTON
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

A large window was blown-out of a house from thunderstorm wind.

Thunderstorm Wind in NATRONA, WYOMING
From 22-AUG-07 16:41:00 to 22-AUG-07 16:41:00 (MST-7)
Location: MILLS
Magnitude: 56.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Power lines reported down at 6th Avenue and Poison Spider Road.

Hail in NATRONA, WYOMING
From 22-AUG-07 18:15:00 to 22-AUG-07 18:15:00 (MST-7)
Location: CASPER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Nickel size hail was measured by a Cooperative Observer near Bates Creek.

Hail in NATRONA, WYOMING
From 22-AUG-07 16:00:00 to 22-AUG-07 16:00:00 (MST-7)
Location: MIDWEST
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail the size of pennies fell at Willow Creek Ranch.

Hail in NATRONA, WYOMING
From 22-AUG-07 16:46:00 to 22-AUG-07 16:46:00 (MST-7)
Location: CASPER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

One inch diameter hail occurred in Casper.

Thunderstorm Wind in NATRONA, WYOMING
From 22-AUG-07 16:33:00 to 22-AUG-07 16:33:00 (MST-7)
Location: CASPER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Wind gusts estimated at 60 mph occurred at the helipad in Casper.

Thunderstorm Wind in NATRONA, WYOMING
From 22-AUG-07 16:33:00 to 22-AUG-07 16:33:00 (MST-7)
Location: CASPER
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A semi-tractor trailer was overturned on Interstate 25 at mile marker 195 because of thunderstorm wind.

Thunderstorm Wind in NATRONA, WYOMING
From 22-AUG-07 16:54:00 to 22-AUG-07 16:54:00 (MST-7)
Location: CASPER
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm wind toppled a semi-tractor trailer on Interstate 25 near mile marker 182.

Hail in NATRONA, WYOMING
From 22-AUG-07 16:50:00 to 22-AUG-07 17:00:00 (MST-7)
Location: CASPER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny-sized hail fell for 10 minutes in association with a thunderstorm.  The parent thunderstorm produced 1.15 inches of rain.

Hail in NATRONA, WYOMING
From 22-AUG-07 17:00:00 to 22-AUG-07 17:00:00 (MST-7)
Location: CASPER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail the size of nickels fell near Paradise Valley.

Hail in NATRONA, WYOMING
From 22-AUG-07 17:02:00 to 22-AUG-07 17:23:00 (MST-7)
Location: CASPER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The public and a Bureau of Reclamation employee measured one inch diameter hail on Casper Mountain.

Hail in NATRONA, WYOMING
From 22-AUG-07 16:50:00 to 22-AUG-07 16:50:00 (MST-7)
Location: CASPER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A CoCoRaHS spotter estimated hail to be the size of golf balls.

Hail in NATRONA, WYOMING
From 22-AUG-07 17:05:00 to 22-AUG-07 17:05:00 (MST-7)
Location: CASPER
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The Natrona County Sheriff's Office relayed a report of 1.50 inch diameter hail on Casper Mountain.

Thunderstorm Wind in SWEETWATER, WYOMING
From 22-AUG-07 16:35:00 to 22-AUG-07 16:35:00 (MST-7)
Location: WAMSUTTER
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind instrumentation at the Kennecott Uranium Mine measured a thunderstorm wind gust of 63 mph.

Thunderstorm Wind in NATRONA, WYOMING
From 22-AUG-07 17:06:00 to 22-AUG-07 17:06:00 (MST-7)
Location: CASPER
Magnitude: 56.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A power line was toppled near the intersection of Mystery Bridge Road and East Yellowstone Road.