Iowa, 1998

Tornadoes and Damaging Wind in Iowa, May 15, 1998

May 15, 1998 · NWS DVN · 6 events in 6 counties and zones

A tornado developed two miles Southwest of Washington Iowa and produced a 30 mile long continuous path of damage and debris as it moved to the Northeast at nearly 30 mph. The tornado weakened and lifted before reaching I-80 near West Branch Iowa shortly before 6pm.

Where it happened

Every event with a place to put it. 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

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The toll

Deaths
0
Injuries
47
Property damage
$15 million
Crop damage
None recorded
Events
6

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 tornado developed two miles Southwest of Washington Iowa and produced a 30 mile long continuous path of damage and debris as it moved to the Northeast at nearly 30 mph. The tornado weakened and lifted before reaching I-80 near West Branch Iowa shortly before 6pm. The tornado continued Northeast across Cedar County Iowa producing another 15 miles of isolated damage...not continuous. The storm producing this tornado continued Northeast producing a brief touchdown one mile west of Oxford Mills Iowa near the intersection of county roads E53 and X64. Another brief touchdown occurred south of Dubuque near Zwingle Iowa before the storm moved into Wisconsin. In Washington Iowa extensive damage was reported to businesses, a church, numerous homes, an apartment complex housing elderly residents and a livestock sale barn. Fourteen single family homes were destroyed, another fourteen received major damage and forty five reported minor damage. Three multi-family housing units were destroyed and two received major damage. Twenty six detached units (sheds and garages) were destroyed or sustained major damage. Across Washington county fourteen farmsteads were hit by the tornado with damage ranging from moderate to heavy. Utility damage was listed at $218,000. In the city of Washington twenty seven individuals sustained minor injuries requiring medical treatment. One person was hospitalized for treatment of injuries he received when his automobile was picked up and rolled over by the tornado. In Johnson County twenty miles of power lines and poles were damaged, fifteen roads were closed due to debris and one bridge was destroyed. Six residences were destroyed, eight more sustained minor the major damage, and three farms were affected. Seventeen people were treated and released for injuries in Johnson County. In Cedar County moderate to heavy damage was reported to five different properties as the tornado destroyed a home, barns, grain bins, machine and hog sheds, a hog nursery and a chicken coop. Two persons near Downey suffered injuries requiring stitches when bricks and debris fell upon them while they were taking shelter in their basement.

The radar

The Quad Cities radar (KDVN), 135 km away, was scanning. The volume nearest the first event began at 21:39 UTC.

Open the radar archive at this moment

Event by event

5 tornado, 1 thunderstorm wind. Local standard time, as filed.

Thunderstorm Wind, Jefferson

When
May 15, 3:40 PM CST
Where
Jefferson County, Fairfield
Property damage
$1,000
Reported by
EMERGENCY MANAGER
Coordinates
41.000, -91.980

Strong thunderstorm winds caused a major power outage across the city due to downed powerlines and tree limbs.

Tornado, Washington

When
May 15, 4:05 PM CST to 4:24 PM CST
Where
Washington County, Washington to 2 mi NE of Washington
Rating
F3
Path length
18 mi
Path width
400 yd
Injuries
28 direct, 0 indirect
Property damage
$9.0 million
Reported by
NWS STORM SURVEY
Coordinates
41.280, -91.730

Tornado, Johnson

When
May 15, 4:24 PM CST to 4:50 PM CST
Where
Johnson County, Hills to 4 mi SE of Iowa City
Rating
F3
Path length
14 mi
Path width
400 yd
Injuries
17 direct, 0 indirect
Property damage
$6.0 million
Reported by
NWS STORM SURVEY
Coordinates
41.520, -91.500

Tornado, Cedar

When
May 15, 5:06 PM CST to 5:27 PM CST
Where
Cedar County, Downey to Clarence
Rating
F3
Path length
15 mi
Path width
400 yd
Injuries
2 direct, 0 indirect
Property damage
$2,000
Reported by
NWS STORM SURVEY
Coordinates
41.620, -91.350

Tornado, Jones

When
May 15, 5:30 PM CST to 5:32 PM CST
Where
Jones County, Onslow to 8 mi W of Oxford Mills
Rating
F0
Path length
0.2 mi
Path width
3 yd
Property damage
$1,000
Reported by
NWS STORM SURVEY
Coordinates
42.020, -91.080

Tornado, Dubuque

When
May 15, 6:10 PM CST to 6:20 PM CST
Where
Dubuque County, 7 mi SW of Dubuque
Rating
F0
Path length
0.3 mi
Path width
1 yd
Property damage
$200
Reported by
NWS STORM SURVEY
Coordinates
42.430, -90.770

What these are

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.
Tornado
A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.

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

The same day elsewhere

More

Every storm in Iowa in 1998Every state in 1998This day in weather historyThe tornado archive for Iowa, 1998Warnings in Iowa, May 1998

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: 5662832, 5662833, 5662834, 5662835, 5662836, 5662837.