Heat, Adams
- When
- July 18, 12:00 PM CST to July 31, 6:00 PM CST
- Where
- Adams forecast zone
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 39.988, -91.188 (the zone’s center; the record gives no point)
Heat in Illinois, July 18 to 31, 1999
A heat wave gripped the region the last 2 weeks of July. Temperatures remained in the middle to upper 90s with a few days topping 100 degrees.
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
The toll
- Deaths
- 8
- Injuries
- 119
- 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 LSX wrote it up.
A heat wave gripped the region the last 2 weeks of July. Temperatures remained in the middle to upper 90s with a few days topping 100 degrees. The Heat Index ranged from 105 to near 115 degrees. Most of the deaths and injuries occurred in the Metro East area of St. Louis, primarily Madison and St. Clair counties.
The radar
The national radar mosaic for the moment the first event began.
Event by event
17 heat. Local standard time, as filed.
Heat, Bond
- When
- July 18, 12:00 PM CST to July 31, 6:00 PM CST
- Where
- Bond forecast zone
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 38.887, -89.436 (the zone’s center; the record gives no point)
Heat, Brown
- When
- July 18, 12:00 PM CST to July 31, 6:00 PM CST
- Where
- Brown forecast zone
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 39.962, -90.750 (the zone’s center; the record gives no point)
Heat, Calhoun
- When
- July 18, 12:00 PM CST to July 31, 6:00 PM CST
- Where
- Calhoun forecast zone
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 39.169, -90.667 (the zone’s center; the record gives no point)
Heat, Clinton
- When
- July 18, 12:00 PM CST to July 31, 6:00 PM CST
- Where
- Clinton forecast zone
- Injuries
- 2 direct, 0 indirect
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 38.607, -89.422 (the zone’s center; the record gives no point)
Heat, Fayette
- When
- July 18, 12:00 PM CST to July 31, 6:00 PM CST
- Where
- Fayette forecast zone
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 39.000, -89.024 (the zone’s center; the record gives no point)
Heat, Greene
- When
- July 18, 12:00 PM CST to July 31, 6:00 PM CST
- Where
- Greene forecast zone
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 39.356, -90.390 (the zone’s center; the record gives no point)
Heat, Jersey
- When
- July 18, 12:00 PM CST to July 31, 6:00 PM CST
- Where
- Jersey forecast zone
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 39.086, -90.357 (the zone’s center; the record gives no point)
Heat, Macoupin
- When
- July 18, 12:00 PM CST to July 31, 6:00 PM CST
- Where
- Macoupin forecast zone
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 39.261, -89.924 (the zone’s center; the record gives no point)
Heat, Madison
- When
- July 18, 12:00 PM CST to July 31, 6:00 PM CST
- Where
- Madison forecast zone
- Deaths
- 1 direct, 0 indirect
- Injuries
- 10 direct, 0 indirect
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 38.830, -89.905 (the zone’s center; the record gives no point)
Heat, Marion
- When
- July 18, 12:00 PM CST to July 31, 6:00 PM CST
- Where
- Marion forecast zone
- Injuries
- 1 direct, 0 indirect
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 38.650, -88.919 (the zone’s center; the record gives no point)
Heat, Monroe
- When
- July 18, 12:00 PM CST to July 31, 6:00 PM CST
- Where
- Monroe forecast zone
- Injuries
- 6 direct, 0 indirect
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 38.279, -90.177 (the zone’s center; the record gives no point)
Heat, Montgomery
- When
- July 18, 12:00 PM CST to July 31, 6:00 PM CST
- Where
- Montgomery forecast zone
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 39.231, -89.479 (the zone’s center; the record gives no point)
Heat, Pike
- When
- July 18, 12:00 PM CST to July 31, 6:00 PM CST
- Where
- Pike forecast zone
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 39.623, -90.886 (the zone’s center; the record gives no point)
Heat, Randolph
- When
- July 18, 12:00 PM CST to July 31, 6:00 PM CST
- Where
- Randolph forecast zone
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 38.052, -89.825 (the zone’s center; the record gives no point)
Heat, St. Clair
- When
- July 18, 12:00 PM CST to July 31, 6:00 PM CST
- Where
- St. Clair forecast zone
- Deaths
- 7 direct, 0 indirect
- Injuries
- 100 direct, 0 indirect
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 38.470, -89.928 (the zone’s center; the record gives no point)
Heat, Washington
- When
- July 18, 12:00 PM CST to July 31, 6:00 PM CST
- Where
- Washington forecast zone
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 38.352, -89.410 (the zone’s center; the record gives no point)
The people who died
As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.
| Event | Date | Age | Sex | Where | Kind |
|---|---|---|---|---|---|
| Heat, Madison | 1999-07-31 | 86 | Female | Permanent Home | Direct |
| Heat, St. Clair | 1999-07-23 | 76 | Male | Mobile/Trailer Home | Direct |
| Heat, St. Clair | 1999-07-28 | 52 | Female | Permanent Home | Direct |
| Heat, St. Clair | 1999-07-30 | 74 | Male | Permanent Home | Direct |
| Heat, St. Clair | 1999-07-31 | 68 | Male | Permanent Home | Direct |
| Heat, St. Clair | 1999-07-31 | 80 | Male | Permanent Home | Direct |
| Heat, St. Clair | 1999-07-23 | 88 | Female | Permanent Home | Direct |
| Heat, St. Clair | 1999-07-27 | 72 | Female | Permanent Home | Direct |
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
- Heat in Missouri, July 18 to 31, 1999
- Heat in Missouri, July 18 to 31, 1999
- Heat in Illinois, July 18 to 31, 1999
- Flash Flooding in Iowa, July 18 to 19, 1999
- Heat in Kentucky, July 18 to 31, 1999
- Heat in Missouri, July 18 to 31, 1999
- Heat in Kansas, July 18 to 31, 1999
- Lightning Strike in Texas, July 18, 1999
- Flash Flooding and Damaging Winds in Iowa, July 18 to 19, 1999
- Flash Flood in Minnesota, July 18, 1999
- Hail and Damaging Winds in New York, July 18, 1999
- Damaging Winds in New York, July 18, 1999
More
Every storm in Illinois in 1999Every state in 1999This day in weather historyWarnings in Illinois, 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: 5710096, 5710097, 5710098, 5710099, 5710100, 5710101, 5710102, 5710103, 5710104, 5710105, 5710106, 5710198, 5710199, 5710200, 5710201, 5710202, 5710203.