Thunderstorm Wind, Mackinac
- When
- July 31, 12:30 AM EST
- Where
- Mackinac County, Curtis
- Measured
- 50 kt (58 mph)
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 46.200, -85.750
Trees down.
Flash Flood and Damaging Winds in Michigan, July 31, 1999
Bow echo moved east across much of eastern upper and northern lower Michigan ahead of a cold front moving over the upper Midwest. Numerous reports of straight line wind damage were associated with the bow.
Where it happened
Every event with a place to put it; 2 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
- 18
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 APX wrote it up.
Bow echo moved east across much of eastern upper and northern lower Michigan ahead of a cold front moving over the upper Midwest. Numerous reports of straight line wind damage were associated with the bow. Storms with heavy rain ahead of bow caused some flooding across Mackinac county.
The radar
The national radar mosaic for the moment the first event began.
Event by event
16 thunderstorm wind, 1 flash flood, 1 lightning. Local standard time, as filed.
Flash Flood, Mackinac
- When
- July 31, 12:30 AM EST
- Where
- Mackinac County, Engadine
- Reported by
- TRAINED SPOTTER
- Coordinates
- 45.872, -84.762 (the zone’s center; the record gives no point)
Few inches of standing water on local streets.
Thunderstorm Wind, Leelanau
- When
- July 31, 1:00 AM EST
- Where
- Leelanau County, Leland
- Measured
- 50 kt (58 mph)
- Reported by
- TRAINED SPOTTER
- Coordinates
- 45.020, -85.750
Thunderstorm Wind, Charlevoix
- When
- July 31, 1:30 AM EST
- Where
- Charlevoix County, Charlevoix
- Measured
- 50 kt (58 mph)
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 45.320, -85.250
Trees and power lines down.
Thunderstorm Wind, Chippewa
- When
- July 31, 1:30 AM EST
- Where
- Chippewa County, Brimley
- Measured
- 50 kt (58 mph)
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 46.400, -84.570
Trees and power lines down.
Thunderstorm Wind, Emmet
- When
- July 31, 1:40 AM EST
- Where
- Emmet County, Harbor Spgs
- Measured
- 65 kt (75 mph)
- Reported by
- TRAINED SPOTTER
- Coordinates
- 45.430, -84.980
Large park benches ripped from ground and thrown.
Thunderstorm Wind, Antrim
- When
- July 31, 1:45 AM EST
- Where
- Antrim County, Bellaire
- Measured
- 50 kt (58 mph)
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 44.970, -85.200
Large tree limbs down.
Thunderstorm Wind, Emmet
- When
- July 31, 1:50 AM EST
- Where
- Emmet County, Pellston Arpt
- Measured
- 65 kt (75 mph)
- Reported by
- TRAINED SPOTTER
- Coordinates
- 45.570, -84.800
Many trees and power lines down. Wind gust measured by automated wind equipment.
Thunderstorm Wind, Grand Traverse
- When
- July 31, 1:57 AM EST
- Where
- Grand Traverse County, Traverse City
- Measured
- 60 kt (69 mph)
- Reported by
- TRAINED SPOTTER
- Coordinates
- 44.770, -85.620
Trees and power lines down. One building destroyed.
Thunderstorm Wind, Cheboygan
- When
- July 31, 2:10 AM EST
- Where
- Cheboygan County, Cheboygan
- Measured
- 50 kt (58 mph)
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 45.650, -84.480
Trees and power lines down.
Lightning, Otsego
- When
- July 31, 2:15 AM EST
- Where
- Otsego County, Elmira
- Reported by
- TRAINED SPOTTER
- Coordinates
- 45.021, -84.599 (the zone’s center; the record gives no point)
Two horses killed by lightning.
Thunderstorm Wind, Wexford
- When
- July 31, 2:18 AM EST
- Where
- Wexford County, Cadillac
- Measured
- 50 kt (58 mph)
- Reported by
- TRAINED SPOTTER
- Coordinates
- 44.250, -85.400
Power lines down.
Thunderstorm Wind, Kalkaska
- When
- July 31, 2:20 AM EST
- Where
- Kalkaska County, Kalkaska
- Measured
- 50 kt (58 mph)
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 44.730, -85.170
Trees down.
Thunderstorm Wind, Otsego
- When
- July 31, 2:20 AM EST
- Where
- Otsego County, Otsego Lake
- Measured
- 50 kt (58 mph)
- Reported by
- NWS EMPLOYEE(OFF DUTY)
- Coordinates
- 44.920, -84.700
Large tree limbs and power lines down.
Thunderstorm Wind, Presque Isle
- When
- July 31, 2:38 AM EST
- Where
- Presque Isle County, 10 mi N of Rogers City
- Measured
- 60 kt (69 mph)
- Reported by
- TRAINED SPOTTER
- Coordinates
- 45.570, -83.830
Thunderstorm Wind, Cheboygan
- When
- July 31, 2:40 AM EST
- Where
- Cheboygan County, Cheboygan
- Measured
- 50 kt (58 mph)
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 45.650, -84.480
Trees and power lines down.
Thunderstorm Wind, Kalkaska
- When
- July 31, 2:40 AM EST
- Where
- Kalkaska County, 2 mi E of Darragh
- Measured
- 50 kt (58 mph)
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 44.770, -85.020
Trees down.
Thunderstorm Wind, Presque Isle
- When
- July 31, 2:40 AM EST
- Where
- Presque Isle County, Hammond
- Measured
- 50 kt (58 mph)
- Reported by
- TRAINED SPOTTER
- Coordinates
- 45.500, -84.030
Trees down.
What these are
- 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.
- 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.
- Lightning
- A lightning strike that killed, injured or caused damage.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Damaging Winds in New York, July 31, 1999
- Heavy Rain in New Mexico, July 31, 1999
- Heat in Arkansas, July 31, 1999
- Hail and Damaging Winds in Michigan, July 31, 1999
- Flash Flood in Colorado, July 31, 1999
- Flooding in Iowa, July 31, 1999
- Hail and Damaging Winds in Ohio, July 31, 1999
- Damaging Winds in Pennsylvania, July 31, 1999
- Damaging Winds in Virginia, July 31, 1999
- Damaging Winds in Ohio, July 31, 1999
- Damaging Winds and Lightning Strike in Ohio, July 31, 1999
- Damaging Winds in West Virginia, July 31, 1999
More
Every storm in Michigan in 1999Every state in 1999This day in weather historyWarnings in Michigan, July 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: 5700399, 5700410, 5700397, 5700400, 5700401, 5700403, 5700402, 5700411, 5700398, 5700404, 5700412, 5700800, 5700406, 5700408, 5700396, 5700405, 5700407, 5700409.