Tornado, Logan
- When
- August 17, 12:50 PM MST
- Where
- Logan County, 6 mi E of Crook
- Rating
- F0
- Path length
- 0.1 mi
- Path width
- 25 yd
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.850, -102.680
Tornadoes and Flash Flood in Colorado, August 17, 1999
A gauntlet of severe weather hammered western Sedgwick County. Numerous tornadoes were reported, along with large hail, very heavy rain and flash flooding.
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
- 8
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 BOU wrote it up.
A gauntlet of severe weather hammered western Sedgwick County. Numerous tornadoes were reported, along with large hail, very heavy rain and flash flooding. The tornadoes formed harmlessly over open country. The combination of heavy rain and hail, however, coupled with the stationary movement of the thunderstorm complex, caused extensive flash flooding. Up to 8 inches of rainfall occurred over a 3-hour period south of Ovid. A few resident were trapped by the floodwaters along the South Platte River. The flooding forced the closure of County Road 29 southbound from Ovid. Numerous accidents were also reported along Interstate 76, when several vehicles hydroplaned and lost control. Large hail, up to baseball size, accumulated up to a foot deep in spots. Extensive damage to vehicles, buildings, crops and land was reported. Approximately 60 farm dwellings, 8 farm structures, 25 pieces of farm equipment and 150 acres of land was damaged.
The radar
The Cheyenne radar (KCYS), 182 km away, was scanning. The volume nearest the first event began at 19:52 UTC.
Event by event
4 tornado, 3 hail, 1 flash flood. Local standard time, as filed.
Tornado, Sedgwick
- When
- August 17, 12:55 PM MST
- Where
- Sedgwick County, 4 mi NW of Sedgwick
- Rating
- F0
- Path length
- 0.1 mi
- Path width
- 25 yd
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.970, -102.570
Tornado, Sedgwick
- When
- August 17, 1:00 PM MST
- Where
- Sedgwick County, 9 mi S of Sedgwick
- Rating
- F0
- Path length
- 0.1 mi
- Path width
- 25 yd
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.800, -102.520
Hail, Sedgwick
- When
- August 17, 1:50 PM MST
- Where
- Sedgwick County, Ovid
- Measured
- 1.75 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.950, -102.380
Hail, Sedgwick
- When
- August 17, 1:50 PM MST
- Where
- Sedgwick County, 5 mi S of Ovid
- Measured
- 1.75 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.880, -102.380
Hail, Sedgwick
- When
- August 17, 1:50 PM MST
- Where
- Sedgwick County, 4 mi S of Ovid
- Measured
- 2.75 in hail
- Reported by
- NEWSPAPER
- Coordinates
- 40.900, -102.380
Tornado, Sedgwick
- When
- August 17, 2:00 PM MST
- Where
- Sedgwick County, 5 mi W of Ovid
- Rating
- F0
- Path length
- 0.1 mi
- Path width
- 25 yd
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.950, -102.480
Two small tornadoes touched down, but did no damage.
Flash Flood, Sedgwick
- When
- August 17, 3:30 PM MST
- Where
- Sedgwick County, 6 mi S of Ovid
- Reported by
- NEWSPAPER
- Coordinates
- 40.876, -102.352 (the zone’s center; the record gives no point)
What these are
- Tornado
- A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.
- Hail
- Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
- 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
- Heat in Oklahoma, August 17, 1999
- Hail and Damaging Winds in Nebraska, August 17, 1999
- Hail and Damaging Wind in Nebraska, August 17, 1999
- Tornadoes and Hail in Nebraska, August 17, 1999
- Hail and Damaging Winds in Nebraska, August 17, 1999
- Damaging Wind and Lightning Strike in New Hampshire, August 17, 1999
- Damaging Winds in New York, August 17, 1999
- Damaging Wind in Florida, August 17, 1999
- Damaging Wind in Nebraska, August 17, 1999
- Lightning Strike in Florida, August 17, 1999
- Hail and Damaging Wind in Nebraska, August 17, 1999
- Hail and Damaging Wind in Kansas, August 17, 1999
More
Every storm in Colorado in 1999Every state in 1999This day in weather historyThe tornado archive for Colorado, 1999Warnings in Colorado, 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: 5718629, 5718630, 5718631, 5718632, 5718633, 5718634, 5718635, 5718636.