Flash Flood, Grand
- When
- August 11, 12:15 PM MST to 1:00 PM MST
- Where
- Grand County, 17 mi N of Moab
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 38.982, -109.570 (the zone’s center; the record gives no point)
Flash Flood in Utah, August 11, 1999
Heavy rain resulted in flash flooding and closed roads in Arches National Park.
Where it happened
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 1
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
What happened
The episode as NWS GJT wrote it up.
Heavy rain resulted in flash flooding and closed roads in Arches National Park.
The radar
The Grand Junction radar (KGJX), 118 km away, was scanning. The volume nearest the first event began at 19:17 UTC.
Event by event
1 flash flood. Local standard time, as filed.
What these are
- Flash Flood
- Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Tornado in Utah, August 11, 1999
- Hail and Damaging Wind in Kansas, August 11 to 26, 1999
- Hail and Damaging Wind in South Dakota, August 11, 1999
- Hail in Colorado, August 11, 1999
- Damaging Winds in Missouri, August 11, 1999
- Hail and Damaging Winds in Virginia, August 11, 1999
- Tornado in North Dakota, August 11, 1999
- Tornado in Wyoming, August 11, 1999
- Hail in Colorado, August 11, 1999
- Hail and Damaging Winds in Wyoming, August 11, 1999
- Hail and Lightning Strike in South Dakota, August 11, 1999
- Hail and Damaging Winds in North Carolina, August 11, 1999
More
Every storm in Utah in 1999Every state in 1999This day in weather historyWarnings in Utah, August 1999
Sources
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5714036.