Michigan, 1999

Heat in Michigan, July 4 to 5, 1999

July 4 to 5, 1999 · NWS DTX · 17 events in 17 counties and zones

Hot and extremely humid weather rolled into southeast Michigan for the Fourth of July holiday weekend. High temperatures climbed into the 90s across the area, with dew points well into the 70s.

Where it happened

Every event with a place to put it; 17 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

Open the live radar over this ground

The toll

Deaths
0
Injuries
52
Property damage
None recorded
Crop damage
None recorded
Events
17

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.

Hot and extremely humid weather rolled into southeast Michigan for the Fourth of July holiday weekend. High temperatures climbed into the 90s across the area, with dew points well into the 70s. This resulted in triple-digit heat indices across southeast Michigan on both the 4th and 5th. The heat index exceeded 105 in and near Detroit. This resulted in numerous heat-related illnesses, as people overdid outdoor activities during the holiday weekend. Numerous hospitals in metro Detroit reported cases of heat stroke, heat exhaustion, dehydration, and severe sunburn. However, unlike many other parts of the country, no fatalities were reported.

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

17 heat. Local standard time, as filed.

Heat, Bay

When
July 4, 11:00 AM EST to July 5, 6:00 PM EST
Where
Bay forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
43.721, -83.942 (the zone’s center; the record gives no point)

Heat, Midland

When
July 4, 11:00 AM EST to July 5, 6:00 PM EST
Where
Midland forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
43.647, -84.388 (the zone’s center; the record gives no point)

Heat, Saginaw

When
July 4, 11:00 AM EST to July 5, 6:00 PM EST
Where
Saginaw forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
43.335, -84.053 (the zone’s center; the record gives no point)

Heat, Huron

When
July 4, 11:00 AM EST to July 5, 6:00 PM EST
Where
Huron forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
43.910, -82.855 (the zone’s center; the record gives no point)

Heat, Tuscola

When
July 4, 11:00 AM EST to July 5, 6:00 PM EST
Where
Tuscola forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
43.491, -83.440 (the zone’s center; the record gives no point)

Heat, Sanilac

When
July 4, 11:00 AM EST to July 5, 6:00 PM EST
Where
Sanilac forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
43.443, -82.646 (the zone’s center; the record gives no point)

Heat, Shiawassee

When
July 4, 11:00 AM EST to July 5, 6:00 PM EST
Where
Shiawassee forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
42.954, -84.147 (the zone’s center; the record gives no point)

Heat, Genesee

When
July 4, 11:00 AM EST to July 5, 6:00 PM EST
Where
Genesee forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
43.022, -83.707 (the zone’s center; the record gives no point)

Heat, Lapeer

When
July 4, 11:00 AM EST to July 5, 6:00 PM EST
Where
Lapeer forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
43.090, -83.222 (the zone’s center; the record gives no point)

Heat, St. Clair

When
July 4, 11:00 AM EST to July 5, 6:00 PM EST
Where
St. Clair forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
42.931, -82.664 (the zone’s center; the record gives no point)

Heat, Livingston

When
July 4, 11:00 AM EST to July 5, 6:00 PM EST
Where
Livingston forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
42.603, -83.911 (the zone’s center; the record gives no point)

Heat, Oakland

When
July 4, 11:00 AM EST to July 5, 6:00 PM EST
Where
Oakland forecast zone
Injuries
20 direct, 0 indirect
Reported by
OFFICIAL NWS OBS.
Coordinates
42.660, -83.386 (the zone’s center; the record gives no point)

Heat, Macomb

When
July 4, 11:00 AM EST to July 5, 6:00 PM EST
Where
Macomb forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
42.673, -82.910 (the zone’s center; the record gives no point)

Heat, Washtenaw

When
July 4, 11:00 AM EST to July 5, 6:00 PM EST
Where
Washtenaw forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
42.253, -83.839 (the zone’s center; the record gives no point)

Heat, Wayne

When
July 4, 11:00 AM EST to July 5, 6:00 PM EST
Where
Wayne forecast zone
Injuries
32 direct, 0 indirect
Reported by
OFFICIAL NWS OBS.
Coordinates
42.285, -83.261 (the zone’s center; the record gives no point)

Heat, Lenawee

When
July 4, 11:00 AM EST to July 5, 6:00 PM EST
Where
Lenawee forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
41.895, -84.066 (the zone’s center; the record gives no point)

Heat, Monroe

When
July 4, 11:00 AM EST to July 5, 6:00 PM EST
Where
Monroe forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
41.921, -83.494 (the zone’s center; the record gives no point)

What these are

Heat
Heat below excessive heat criteria that still caused deaths, injuries or significant impacts.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

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: 5707971, 5707972, 5707973, 5708055, 5708056, 5708057, 5708058, 5708059, 5708060, 5708061, 5708062, 5708063, 5708064, 5708065, 5708066, 5708067, 5708068.