Heat in Iowa, July 19 to 31, 1999

Name: Heat in Iowa, July 19 to 31, 1999
Start: 1999-07-19T04:00
End: 1999-07-31T20:00
Location: Iowa

July 19 to 31, 1999 · NWS DVN · 22 events in 22 counties and zones

S. produced very hot and humid conditions over the midwest from mid to late July.

Where it happened

Every event with a place to put it; 22 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: 0
Property damage: None recorded
Crop damage: None recorded
Events: 22

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 DVN wrote it up.

A strong ridge of high pressure over the central U.S. produced very hot and humid conditions over the midwest from mid to late July. Heat advisories and warnings were issued for portions of eastern Iowa during the period. Temperatures around the 100 degree mark combined with dewpoints in the 70s produced heat indicies of 105 to as high as 125 degrees. Newspaper accounts indicate at least 19 people in Illinois, and 27 in Missouri, died from heat-related factors since July 19th.

The radar

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

Open the radar archive at this moment

Event by event

22 heat. Local standard time, as filed.

Heat, Benton

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Benton forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 42.080, -92.066 (the zone’s center; the record gives no point)

Heat, Buchanan

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Buchanan forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 42.471, -91.838 (the zone’s center; the record gives no point)

Heat, Cedar

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Cedar forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 41.772, -91.132 (the zone’s center; the record gives no point)

Heat, Clayton

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Clayton forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 42.845, -91.341 (the zone’s center; the record gives no point)

Heat, Clinton

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Clinton forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 41.898, -90.532 (the zone’s center; the record gives no point)

Heat, Delaware

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Delaware forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 42.471, -91.367 (the zone’s center; the record gives no point)

Heat, Des Moines

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Des Moines forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 40.923, -91.181 (the zone’s center; the record gives no point)

Heat, Dubuque

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Dubuque forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 42.469, -90.882 (the zone’s center; the record gives no point)

Heat, Henry

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Henry forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 40.988, -91.544 (the zone’s center; the record gives no point)

Heat, Iowa

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Iowa forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 41.686, -92.065 (the zone’s center; the record gives no point)

Heat, Jackson

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Jackson forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 42.172, -90.574 (the zone’s center; the record gives no point)

Heat, Jefferson

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Jefferson forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 41.032, -91.949 (the zone’s center; the record gives no point)

Heat, Johnson

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Johnson forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 41.672, -91.588 (the zone’s center; the record gives no point)

Heat, Jones

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Jones forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 42.121, -91.131 (the zone’s center; the record gives no point)

Heat, Keokuk

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Keokuk forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 41.337, -92.179 (the zone’s center; the record gives no point)

Heat, Lee

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Lee forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 40.642, -91.479 (the zone’s center; the record gives no point)

Heat, Linn

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Linn forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 42.079, -91.599 (the zone’s center; the record gives no point)

Heat, Louisa

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Louisa forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 41.219, -91.260 (the zone’s center; the record gives no point)

Heat, Muscatine

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Muscatine forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 41.484, -91.113 (the zone’s center; the record gives no point)

Heat, Scott

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Scott forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 41.637, -90.623 (the zone’s center; the record gives no point)

Heat, Van Buren

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Van Buren forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 40.753, -91.950 (the zone’s center; the record gives no point)

Heat, Washington

When: July 19, 4:00 AM CST to July 31, 8:00 PM CST
Where: Washington forecast zone
Reported by: OFFICIAL NWS OBS.
Coordinates: 41.336, -91.718 (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

Every storm in Iowa in 1999 Every state in 1999 This day in weather history Warnings in Iowa, 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: 5719665, 5719666, 5719667, 5719668, 5719669, 5719670, 5719671, 5719672, 5719673, 5719721, 5719722, 5719723, 5719724, 5719725, 5719726, 5719727, 5719728, 5719729, 5719730, 5719731, 5719732, 5719733.