Copious moisture was brought north into Wyoming in strong monsoonal flow.  Low-level upslope flow from the north aided the development of showers and thunderstorms.  Atmospheric moisture values were around 200 percent of normal.

Flash Flood in PARK, WYOMING
From 25-JUL-07 16:30:00 to 25-JUL-07 16:35:00 (MST-7)
Location: EAST ENTRANCE
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Heavy rain caused a mudslide across East Entrance Road near Sylvan Pass.  The slide varied in depth from one to five feet, was about 50 feet long, and covered both lanes of the road.  The road remained closed for about 14 hours until crews could open a single lane.

Flash Flood in NATRONA, WYOMING
From 25-JUL-07 16:55:00 to 25-JUL-07 20:30:00 (MST-7)
Location: MILLS
Flood cause: Heavy Rain
Property damage: 300.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Rainfall estimated by radar to be three inches or more fell in a swath from Emigrant Gap to Bar Nunn.  The heavy rain caused flash flooding along Poison Spider Road and other nearby roads as culverts could not handle the large volume of water.  Portions of a ranch along Poison Spider Road were under several feet of water.  A mobile home park south of Bar Nunn was flooded as water flowed from surrounding higher terrain.  The lower floor of the rural Poison Spider Elementary School sustained flood damage as the water poured in through several doorways.

Flash Flood in FREMONT, WYOMING
From 25-JUL-07 16:30:00 to 25-JUL-07 17:30:00 (MST-7)
Location: DUBOIS
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Newspaper

Heavy rainfall of over one inch fell in about 30 minutes on the west side of Dubois.  Hardest hit were locations between the golf course and U.S. Highway 26.  Culverts were unable to handle the heavy rain, so water flowed over the top of at least one road.  Overflowing washes created temporary waterfalls pushing water and mud across Ramshorn Street (U.S. Highway 26 in Dubois).  A gas station along Warm Springs Drive reported two inches of mud and water inside the associated convenience store.  An antique pool table store had over one-half foot of water inside.  The Dubois cooperative observer recorded 1.39 inches of rainfall during the storm.  This set an all-time daily precipitation record for the station, which has recorded weather observations for nearly 90 years.

Flash Flood in PARK, WYOMING
From 25-JUL-07 14:30:00 to 25-JUL-07 16:00:00 (MST-7)
Location: VALLEY
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: County Official

Heavy rainfall caused three separate mudslides near Valley.  The mud enveloped the Valley School and trapped 15 vehicles on the South Fork Road.  The slides were not entirely cleared for two days.

Flash Flood in FREMONT, WYOMING
From 25-JUL-07 17:45:00 to 25-JUL-07 18:15:00 (MST-7)
Location: LANDER
Flood cause: Heavy Rain
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm produced 1.70 inches of rain in less than 30 minutes in Red Canyon.  The learning center at Red Canyon Ranch was inundated with six inches of mud and water causing extensive damage.  The mud, rock, and water also flooded a barn, shop, and several corrals at the ranch.  Red Canyon Creek and other small tributaries were out of their banks.  Road damage on the ranch was widespread.  The county portion of Red Canyon Road was covered with a three-foot-deep mud flow which closed the road for much of the next week.  At least one nearby residence sustained damage to a basement and destruction of their backyard landscaping due to a mud and water flow.