Iowa, 2002

Tornadoes and Damaging Winds in Iowa, August 21, 2002

August 21, 2002 · NWS DVN · 6 events in 3 counties and zones

2 thunderstorm wind, 2 tornado, 2 funnel cloud, as filed by the National Weather Service.

Where it happened

Every event with a place to put it; 2 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
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 forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Quad Cities, IA wrote its last area forecast discussion before the first event at Aug 21, 12:51 PM CST, 2 hours 9 minutes earlier.

Area forecast discussion, Aug 21, 12:51 PM CST, 2 hours 9 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
151 PM CDT WED AUG 21 2002

SYNOPSIS...
MORNING UA AND SURFACE ANALISIS SHOWS THE AREA IS NOW IN THE WARM AND
MOIST SECTOR.  THE SURFACE WARM FRONT AT 15Z EXTENDS FROM NEAR FSD TO
ALO TO VYS.  WELL DEFINED SHORT WAVE JUST WEST OF MCI AT 12Z...NOW
APPROACHING THE UPPER MIDWEST FROM THE SOUTHWEST.  THIS WAVE HAS
SPAWNED OVERNIGHT CONVECTION FROM KANSAS THROUGH NORTHWEST IOWA.  MUCH
OF THIS IS NOW DECAYING AS EXPECTED...WITH THE EXCEPTION OF PORTION
NEAR MCI.  THIS WILL BE THE CONVECTIVE CLUSTER TO WATCH AS IT
APPROACHES THE CWA THIS AFTERNOON.  CIRRUS AND DEBRIS CLOUDS CONTINUE
TO SLOWLY THIN NORTH OF INTERSTATE 80...WITH MODERATED INSOLATION
ALREADY IN PLACE SOUTH OF THE INTERSTATE.  THIS WILL ALLOW ADEQUATE
HEATING FOR STORMS TO INTENSIFY IN OUR AREA THIS AFTERNOON.

SHORT TERM...
SEVERE WEATHER THREAT WILL MAINLY AFFECT THE AREA THIS EVENING...WITH
HEAVY RAIN EXPECTED LATE EVENING AND OVERNIGHT.  PWAT VALUES IN EXCESS
OF TWO INCHES NOTED ON THE OMA 12Z SOUNDING AND NEAR 2 INCHES ON 18Z
DVN SOUNDING...SHOW TROPICAL AIRMASS OVER THE REGION.  DESPITE MODEL
DIFFERENCES...ALL SHORT TERM MODELS INDICATE DIFFLUENT THICKNESS OVER
THE CWA TONIGHT THROUGH THURSDAY MORNING.  TRAINING CELLS APPEAR TO BE
LIKELY GIVEN NEARY STATIONARY BOUNDARY OVER THE CWA.  ALL THIS SAID...
COUNTY FFG GUIDANCE VALUES ARE RUNNING RATHER HIGH AND CROPS ARE MATURE.
 THEREFORE I FEEL WIDESPREAD FLOODING PROBLEMS DO NOT WARRANT A FLOOD
WATCH AT THIS TIME. URBAN FLOODING MAY BECOME AN ISSUE...IF STORMS PICK
ON ONE AREA REPEATEDLY.  THE FRONT BECOMES QUASI-STATIONARY THURSDAY AND
FRIDAY...WITH SEVERAL ROUNDS OF HEAVY RAIN AND THUNDESTORMS EXPECTED
THROUGH FRIDAY NIGHT.  IF HEAVY RAIN DOES MATERIALIZE TONIGHT...A FLOOD
WATCH MAY BE NEEDED FOR THURSDAY NIGHT AND FRIDAY FOR AREAS THAT RECIEVE
HEAVY RAIN TONIGHT.

EXTENDED...
NO MAJOR CHANGES EXPECTED IN EXTENDED AS CANADIAN HIGH SETTLES SOUTH
ACROSS THE AREA FOR SEVERAL DAYS OF PLEASANT WEATHER.  MRF AND UKMET
CONTINUE TO INDICATE A LOBE UPPER LEVEL VORTICITY WORKING SOUTH
ACROSS THE AREA MONDAY.  FOR NOW...I WILL NOT CHANGES THE GOING
FORECAST...BUT SHOWERS MAY NEED TO BE ADDED IF THIS FEATURE MOVES OVER
THE AREA DURING PEAK HEATING.  OTHERWISE...DRY WEATHER WILL CONTINUE
THROUGH WEDNESDAY...WITH SLOWLY MODERATING TEMPERATURES.

.DVN...
IA...NONE.
IL...NONE.
MO...NONE.

ERVIN/DVN LAST/OMA NEXT

In the hours before

Local storm report, Aug 21, 2:36 PM CST, 24 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
336 PM CDT WED AUG 21 2002

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0324 PM    12 E FAIRBANK             IA   50-55 MPH TSTM GUST
08/21/02   BUCHANAN                       WIND SPEEDS ESTIMATED.
                                          REPORTED BY STORM
                                          SPOTTER.

The radar

The Quad Cities radar (KDVN), 105 km away, was scanning. The volume nearest the first event began at 20:57 UTC.

Open the radar archive at this moment

Event by event

2 thunderstorm wind, 2 tornado, 2 funnel cloud. Local standard time, as filed.

Thunderstorm Wind, Washington

When
August 21, 3:00 PM CST
Where
Washington County, Wellman
Measured
61 kt (70 mph)
Reported by
LAW ENFORCEMENT
Coordinates
41.467, -91.833

Several large trees blown down, barn on 540th Street Southwest heavily damaged, and corn flattened in spots on Angle Road Southwest.

Thunderstorm Wind, Muscatine

When
August 21, 4:56 PM CST
Where
Muscatine County, Nichols
Measured
52 kt (60 mph)
Reported by
LAW ENFORCEMENT
Coordinates
41.483, -91.317

Power lines and tree limbs blown down.

Tornado, Muscatine

When
August 21, 5:15 PM CST to 5:21 PM CST
Where
Muscatine County, 3 mi N of Muscatine
Rating
F1
Path length
1.6 mi
Path width
100 yd
Reported by
NWS STORM SURVEY
Coordinates
41.467, -91.050

An F1 tornado touched down north of Muscatine near Highway 38 doing extensive damage to a machine shed that housed a tractor, disk, planter and field cultivator. Damage to the shed and equipment was estimated at over $200,000. Nearby, the roof was partially blown off a farm house and windows were blown out. Also, it was reported that a pickup truck parked at the farm house was launched 40 feet, landing on an old garage. Corn was also flattened in spots, and trees were blown down starting at the Municipal Golf Course and continuing along the path.

Funnel Cloud, Muscatine

When
August 21, 5:30 PM CST
Where
Muscatine County, 4 mi W of Montpelier
Reported by
TRAINED SPOTTER
Coordinates
41.484, -91.113 (the zone’s center; the record gives no point)

Funnel Cloud, Scott

When
August 21, 5:55 PM CST
Where
Scott County, 2 mi N of Blue Grass
Reported by
NWS EMPLOYEE(OFF DUTY)
Coordinates
41.637, -90.623 (the zone’s center; the record gives no point)

Tornado, Scott

When
August 21, 6:00 PM CST
Where
Scott County, 2 mi N of Blue Grass
Rating
F0
Path length
0.1 mi
Path width
10 yd
Reported by
TRAINED SPOTTER
Coordinates
41.550, -90.767

An F0 tornado touched down briefly north of Blue Grass tearing down a large tree limb. Otherwise, no injuries or damage was reported.

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.
Funnel Cloud
A rotating column of cloud extending from a thunderstorm that did not reach the ground.

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

The same day elsewhere

More

Every storm in Iowa in 2002Every state in 2002This day in weather historyThe tornado archive for Iowa, 2002Warnings in Iowa, August 2002

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: 5312754, 5312755, 5312756, 5312845, 5312757, 5312844.