Heat in Ohio, July 20 to 31, 1999

Name: Heat in Ohio, July 20 to 31, 1999
Start: 1999-07-20T00:00
End: 1999-07-31T23:59
Location: Ohio

July 20 to 31, 1999 · NWS ILN · 32 events in 32 counties and zones

Where it happened

Every event with a place to put it; 32 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: 13
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 32

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 ILN wrote it up.

The last part of July was very hot and humid across the state with temperatures reaching into the 90s most days and above 100 for a few days. The dewpoints and overnight lows were in the 70s through much of the period. The excessive heat contributed to 10 deaths in the Cincinnati metro area and 3 in the Dayton metro area.

The radar

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

Open the radar archive at this moment

Event by event

32 heat. Local standard time, as filed.

Heat, Adams

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Adams forecast zone
Deaths: 13 direct, 0 indirect
Reported by: NEWSPAPER
Coordinates: 38.846, -83.472 (the zone’s center; the record gives no point)

Heat, Auglaize

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Auglaize forecast zone
Reported by: NEWSPAPER
Coordinates: 40.561, -84.222 (the zone’s center; the record gives no point)

Heat, Brown

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Brown forecast zone
Reported by: NEWSPAPER
Coordinates: 38.934, -83.867 (the zone’s center; the record gives no point)

Heat, Butler

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Butler forecast zone
Reported by: NEWSPAPER
Coordinates: 39.439, -84.576 (the zone’s center; the record gives no point)

Heat, Champaign

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Champaign forecast zone
Reported by: NEWSPAPER
Coordinates: 40.138, -83.769 (the zone’s center; the record gives no point)

Heat, Clark

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Clark forecast zone
Reported by: NEWSPAPER
Coordinates: 39.917, -83.784 (the zone’s center; the record gives no point)

Heat, Clermont

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Clermont forecast zone
Reported by: NEWSPAPER
Coordinates: 39.047, -84.152 (the zone’s center; the record gives no point)

Heat, Clinton

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Clinton forecast zone
Reported by: NEWSPAPER
Coordinates: 39.415, -83.808 (the zone’s center; the record gives no point)

Heat, Darke

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Darke forecast zone
Reported by: NEWSPAPER
Coordinates: 40.133, -84.619 (the zone’s center; the record gives no point)

Heat, Delaware

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Delaware forecast zone
Reported by: NEWSPAPER
Coordinates: 40.278, -83.005 (the zone’s center; the record gives no point)

Heat, Fairfield

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Fairfield forecast zone
Reported by: NEWSPAPER
Coordinates: 39.752, -82.631 (the zone’s center; the record gives no point)

Heat, Fayette

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Fayette forecast zone
Reported by: NEWSPAPER
Coordinates: 39.560, -83.456 (the zone’s center; the record gives no point)

Heat, Franklin

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Franklin forecast zone
Reported by: NEWSPAPER
Coordinates: 39.970, -83.009 (the zone’s center; the record gives no point)

Heat, Greene

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Greene forecast zone
Reported by: NEWSPAPER
Coordinates: 39.692, -83.890 (the zone’s center; the record gives no point)

Heat, Hamilton

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Hamilton forecast zone
Reported by: NEWSPAPER
Coordinates: 39.196, -84.543 (the zone’s center; the record gives no point)

Heat, Hardin

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Hardin forecast zone
Reported by: NEWSPAPER
Coordinates: 40.662, -83.659 (the zone’s center; the record gives no point)

Heat, Highland

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Highland forecast zone
Reported by: NEWSPAPER
Coordinates: 39.185, -83.601 (the zone’s center; the record gives no point)

Heat, Hocking

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Hocking forecast zone
Reported by: NEWSPAPER
Coordinates: 39.497, -82.479 (the zone’s center; the record gives no point)

Heat, Licking

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Licking forecast zone
Reported by: NEWSPAPER
Coordinates: 40.092, -82.483 (the zone’s center; the record gives no point)

Heat, Logan

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Logan forecast zone
Reported by: NEWSPAPER
Coordinates: 40.388, -83.766 (the zone’s center; the record gives no point)

Heat, Madison

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Madison forecast zone
Reported by: NEWSPAPER
Coordinates: 39.894, -83.400 (the zone’s center; the record gives no point)

Heat, Mercer

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Mercer forecast zone
Reported by: NEWSPAPER
Coordinates: 40.540, -84.629 (the zone’s center; the record gives no point)

Heat, Miami

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Miami forecast zone
Reported by: NEWSPAPER
Coordinates: 40.053, -84.229 (the zone’s center; the record gives no point)

Heat, Montgomery

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Montgomery forecast zone
Reported by: NEWSPAPER
Coordinates: 39.755, -84.291 (the zone’s center; the record gives no point)

Heat, Pickaway

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Pickaway forecast zone
Reported by: NEWSPAPER
Coordinates: 39.642, -83.024 (the zone’s center; the record gives no point)

Heat, Pike

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Pike forecast zone
Reported by: NEWSPAPER
Coordinates: 39.077, -83.067 (the zone’s center; the record gives no point)

Heat, Preble

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Preble forecast zone
Reported by: NEWSPAPER
Coordinates: 39.742, -84.648 (the zone’s center; the record gives no point)

Heat, Ross

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Ross forecast zone
Reported by: NEWSPAPER
Coordinates: 39.338, -83.057 (the zone’s center; the record gives no point)

Heat, Scioto

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Scioto forecast zone
Reported by: NEWSPAPER
Coordinates: 38.804, -82.993 (the zone’s center; the record gives no point)

Heat, Shelby

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Shelby forecast zone
Reported by: NEWSPAPER
Coordinates: 40.332, -84.205 (the zone’s center; the record gives no point)

Heat, Union

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Union forecast zone
Reported by: NEWSPAPER
Coordinates: 40.299, -83.372 (the zone’s center; the record gives no point)

Heat, Warren

When: July 20, 12:00 AM EST to July 31, 11:59 PM EST
Where: Warren forecast zone
Reported by: NEWSPAPER
Coordinates: 39.428, -84.167 (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, Adams	1999-07-26	34	Female	Permanent Home	Direct
Heat, Adams	1999-07-31	46	Male	Permanent Home	Direct
Heat, Adams	1999-07-26	47	Male	Permanent Home	Direct
Heat, Adams	1999-07-31	50	Male	Permanent Home	Direct
Heat, Adams	1999-07-26	69	Male	Permanent Home	Direct
Heat, Adams	1999-07-26	70	Female	Permanent Home	Direct
Heat, Adams	1999-07-26	75	Female	Permanent Home	Direct
Heat, Adams	1999-07-30	83	Male	Permanent Home	Direct
Heat, Adams	1999-07-26	85	Male	Permanent Home	Direct
Heat, Adams	1999-07-26	88	Female	Permanent Home	Direct
Heat, Adams	1999-07-26	91	Female	Permanent Home	Direct
Heat, Adams	1999-07-26	98	Female	Permanent Home	Direct
Heat, Adams	1999-07-26	64	Male	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

Every storm in Ohio in 1999 Every state in 1999 This day in weather history Warnings in Ohio, 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: 5707187, 5707188, 5707189, 5707190, 5707191, 5707192, 5707193, 5707194, 5707195, 5707196, 5707197, 5707198, 5707199, 5707200, 5707201, 5707202, 5707203, 5707204, 5707205, 5707206, 5707207, 5707208, 5707209, 5707210, 5707211, 5707212, 5707213, 5707214, 5707215, 5707216, 5707217, 5707218.