Heat, Columbia
- When
- July 23, 2:00 AM CST to July 24, 8:00 PM CST
- Where
- Columbia forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.467, -89.334 (the zone’s center; the record gives no point)
Heat in Wisconsin, July 23 to 24, 1999
Hot, muggy air settled over portions of southcentral and southeast Wisconsin in between rounds of thunderstorms. Early morning heat indices were around 80, and they rose to 105 to 110 during the afternoon hours.
Where it happened
Every event with a place to put it; 11 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
- 11
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 MKX wrote it up.
Hot, muggy air settled over portions of southcentral and southeast Wisconsin in between rounds of thunderstorms. Early morning heat indices were around 80, and they rose to 105 to 110 during the afternoon hours. Maximum air temperatures in the afternoon were in the lower to middle 90s and afternoon dewpoints were in the lower to mid 70s. Nighttime minimum air temperatures were generally in the lower 70s. The heat and humidity forced a near record demand for electricity, resulting in brownouts that left about 5000 customers without power for several hours on the 23rd, and 7000 customers without power on the 24th.
The radar
The national radar mosaic for the moment the first event began.
Event by event
11 heat. Local standard time, as filed.
Heat, Dane
- When
- July 23, 2:00 AM CST to July 24, 8:00 PM CST
- Where
- Dane forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.067, -89.418 (the zone’s center; the record gives no point)
Heat, Milwaukee
- When
- July 23, 2:00 AM CST to July 24, 8:00 PM CST
- Where
- Milwaukee forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.022, -87.929 (the zone’s center; the record gives no point)
Heat, Rock
- When
- July 23, 2:00 AM CST to July 24, 8:00 PM CST
- Where
- Rock forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 42.671, -89.072 (the zone’s center; the record gives no point)
Heat, Racine
- When
- July 23, 2:00 AM CST to July 24, 8:00 PM CST
- Where
- Racine forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 42.730, -87.812 (the zone’s center; the record gives no point)
Heat, Jefferson
- When
- July 23, 2:00 AM CST to July 24, 8:00 PM CST
- Where
- Jefferson forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.021, -88.776 (the zone’s center; the record gives no point)
Heat, Walworth
- When
- July 23, 2:00 AM CST to July 24, 8:00 PM CST
- Where
- Walworth forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 42.669, -88.542 (the zone’s center; the record gives no point)
Heat, Kenosha
- When
- July 23, 2:00 AM CST to July 24, 8:00 PM CST
- Where
- Kenosha forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 42.573, -87.840 (the zone’s center; the record gives no point)
Heat, Dodge
- When
- July 23, 2:00 AM CST to July 24, 8:00 PM CST
- Where
- Dodge forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.416, -88.707 (the zone’s center; the record gives no point)
Heat, Washington
- When
- July 23, 2:00 AM CST to July 24, 8:00 PM CST
- Where
- Washington forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.369, -88.231 (the zone’s center; the record gives no point)
Heat, Ozaukee
- When
- July 23, 2:00 AM CST to July 24, 8:00 PM CST
- Where
- Ozaukee forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.403, -87.891 (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
- Heat in Missouri, July 23 to 31, 1999
- Heat in Pennsylvania, July 23 to 31, 1999
- Heat in Wisconsin, July 23 to 31, 1999
- Hail and Damaging Winds in Michigan, July 23, 1999
- Heat in Minnesota, July 23 to 25, 1999
- Heat in Maryland, July 23 to 31, 1999
- Heat in South Carolina, July 23, 1999
- Heat in Arkansas, July 23, 1999
- Heat in Delaware, July 23 to 31, 1999
- Hail and Damaging Winds in Wisconsin, July 23, 1999
- Tornadoes and Hail in Michigan, July 23, 1999
- Hail and Damaging Winds in Ohio, July 23, 1999
More
Every storm in Wisconsin in 1999Every state in 1999This day in weather historyWarnings in Wisconsin, 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 2026-10-01. Each event’s entry at NCEI: 5709987, 5709988, 5709989, 5709990, 5709991, 5709992, 5709993, 5709994, 5709995, 5709996, 5709997.