Iowa, 1999

Damaging Wind and Lightning Strike in Iowa, August 12, 1999

August 12, 1999 · NWS DMX · 2 events in 2 counties and zones

Thunderstorms rolled across Warren County. As they passed through the Indianola area, three lightning bolts descended upon Hillman Hall on the Simpson College campus.

Where it happened

Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

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The toll

Deaths
0
Injuries
0
Property damage
$21,000
Crop damage
None recorded
Events
2

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 DMX wrote it up.

Thunderstorms rolled across Warren County. As they passed through the Indianola area, three lightning bolts descended upon Hillman Hall on the Simpson College campus. The lightning struck the northwest central tower, punching an 18 inch hole through nearly 10 inches of brick. In addition to the structural damage, part of the buildings's phone and fire alarm systems were damaged. Total damage was placed at $16,000. As the storms moved east, once cell became severe around 0100 CST in Davis County. Damage occurred on a farm near Pulaski with several sheds flattened and some damage reported to the farm house.

The radar

The Des Moines radar (KDMX), 46 km away, was scanning. The volume nearest the first event began at 07:04 UTC.

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Event by event

1 lightning, 1 thunderstorm wind. Local standard time, as filed.

Lightning, Warren

When
August 12, 12:10 AM CST
Where
Warren County, Indianola
Property damage
$16,000
Reported by
NEWSPAPER
Coordinates
41.334, -93.561 (the zone’s center; the record gives no point)

Thunderstorm Wind, Davis

When
August 12, 1:02 AM CST
Where
Davis County, Pulaski
Measured
61 kt (70 mph)
Property damage
$5,000
Reported by
NEWSPAPER
Coordinates
40.700, -92.270

What these are

Lightning
A lightning strike that killed, injured or caused damage.
Thunderstorm Wind
Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.

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

The same day elsewhere

More

Every storm in Iowa in 1999Every state in 1999This day in weather historyWarnings in Iowa, August 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: 5712059, 5712060.