Hail, Phillips
- When
- August 10, 1:50 PM MST
- Where
- Phillips County, 6 mi S of Holyoke
- Measured
- 1 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.500, -102.300
Tornadoes and Flash Flood in Colorado, August 10, 1999
3 hail, 3 thunderstorm wind, 3 tornado, 1 flash flood, as filed by the National Weather Service.
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
- 10
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.
The radar
The Goodland radar (KGLD), 136 km away, was scanning. The volume nearest the first event began at 20:49 UTC.
Event by event
3 hail, 3 thunderstorm wind, 3 tornado, 1 flash flood. Local standard time, as filed.
Hail, Logan
- When
- August 10, 2:35 PM MST
- Where
- Logan County, 2 mi S of Merino
- Measured
- 1 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.450, -103.350
Hail, Logan
- When
- August 10, 2:58 PM MST
- Where
- Logan County, 28 mi SE of Sterling
- Measured
- 0.75 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.350, -102.820
Thunderstorm Wind, Weld
- When
- August 10, 3:40 PM MST
- Where
- Weld County, 6 mi S of Ft Lupton
- Measured
- 70 kt (81 mph)
- Reported by
- GENERAL PUBLIC
- Coordinates
- 40.000, -104.800
Tornado, Weld
- When
- August 10, 3:46 PM MST
- Where
- Weld County, 6 mi S of Ft Lupton
- Rating
- F0
- Path length
- 0.1 mi
- Path width
- 25 yd
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 40.000, -104.800
A small tornado touched down, but did no damage.
Tornado, Weld
- When
- August 10, 3:55 PM MST
- Where
- Weld County, Platteville
- Rating
- F1
- Path length
- 0.1 mi
- Path width
- 25 yd
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 40.220, -104.820
A small tornado touched down, downing some power lines as well a tree, which fell onto a house.
Thunderstorm Wind, Morgan
- When
- August 10, 4:28 PM MST
- Where
- Morgan County, 3 mi S of Wiggins
- Measured
- 58 kt (67 mph)
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.180, -104.070
Tornado, Weld
- When
- August 10, 4:31 PM MST
- Where
- Weld County, 3 mi W of Nunn
- Rating
- F0
- Path length
- 0.1 mi
- Path width
- 25 yd
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.700, -104.820
Two small tornadoes touched down, but did no damage.
Thunderstorm Wind, Morgan
- When
- August 10, 5:08 PM MST
- Where
- Morgan County, Ft Morgan
- Measured
- 56 kt (64 mph)
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 40.250, -103.800
Strong thunderstorm winds blew a pickup truck off Interstate 76.
Flash Flood, Phillips
- When
- August 10, 6:30 PM MST to 8:45 PM MST
- Where
- Phillips County, 12 mi SE of Haxtun
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.594, -102.358 (the zone’s center; the record gives no point)
Thunderstorms producing heavy rain, with storm totals from 3 to 6 inches, caused flooding and flash flooding problems southeast of Haxtun, near the Yuma county line. Several county roads were washed out with widespread field flooding reported. Heavy rain coupled with small hail, stripped corn and sunflower crops in the area.
What these are
- Hail
- Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
- Thunderstorm Wind
- Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
- 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.
- 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 Texas, August 10 to 12, 1999
- Flooding and Hail in Arizona, August 10 to 31, 1999
- Flash Flooding in Nebraska, August 10 to 11, 1999
- Flash Flood and Hail in Nebraska, August 10, 1999
- Flood in Colorado, August 10, 1999
- Tornadoes and Flash Flood in Colorado, August 10, 1999
- Damaging Wind and Lightning Strikes in Oklahoma, August 10, 1999
- Damaging Wind in Oklahoma, August 10, 1999
- Hail in Oregon, August 10, 1999
- Hail in Colorado, August 10, 1999
- Hail and Lightning Strike in Wisconsin, August 10, 1999
- Hail in Kansas, August 10 to 11, 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: 5718526, 5718527, 5718528, 5718529, 5718530, 5718531, 5718532, 5718533, 5718534, 5718535.