Thunderstorm Wind, Shiawassee
- When
- June 28, 8:20 PM EST
- Where
- Shiawassee County, Byron
- Measured
- 52 kt (60 mph)
- Property damage
- $4,000
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 42.820, -83.950
Flash Flood and Damaging Winds in Michigan, June 28 to 29, 1999
A slow moving cold front was drifting southeast across Michigan, with a weak area of low pressure moving northeast along the front. These helped numerous thunderstorms develop during the evening and nighttime hours.
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
- $25,000
- Crop damage
- None recorded
- Events
- 3
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 DTX wrote it up.
A slow moving cold front was drifting southeast across Michigan, with a weak area of low pressure moving northeast along the front. These helped numerous thunderstorms develop during the evening and nighttime hours. Only a couple of these became severe, with trees and power lines downed in Byron and Sparlingville.Training of thunderstorms occurred for a short time in the evening in northern Oakland County. A spotter measured 3.64 inches of rain from 845 pm to 1045 pm EDT in Ortonville. Runoff caused flash flooding in northern Oakland County, with several gravel roads washed out in rural areas, and some street flooding in the towns of Holly and Ortonville.
The radar
The Detroit radar (KDTX), 41 km away, was scanning. The volume nearest the first event began at 01:19 UTC.
Event by event
2 thunderstorm wind, 1 flash flood. Local standard time, as filed.
Flash Flood, Oakland
- When
- June 28, 9:40 PM EST to June 29, 12:45 AM EST
- Where
- Oakland County, Holly
- Property damage
- $15,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 42.660, -83.386 (the zone’s center; the record gives no point)
Thunderstorm Wind, St. Clair
- When
- June 28, 10:00 PM EST
- Where
- St. Clair County, Sparlingville
- Measured
- 52 kt (60 mph)
- Property damage
- $6,000
- Reported by
- NEWSPAPER
- Coordinates
- 42.970, -82.520
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.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Flash Flood in Alabama, June 28, 1999
- Heavy Rain in Alabama, June 28, 1999
- Flash Flood in Alabama, June 28, 1999
- Tornado in Missouri, June 28, 1999
- Damaging Winds in Kansas, June 28, 1999
- Flash Flood in Alabama, June 28, 1999
- Flash Flood and Flooding in Kansas, June 28, 1999
- Tornado and Lightning Strike in Georgia, June 28, 1999
- Damaging Winds in Kansas, June 28, 1999
- Flash Flood in Alabama, June 28, 1999
- Hail and Damaging Winds in Michigan, June 28, 1999
- High Wind in Oklahoma, June 28, 1999
More
Every storm in Michigan in 1999Every state in 1999This day in weather historyWarnings in Michigan, June 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: 5706326, 5706328, 5706327.