Tornadoes · United States · Iowa · 2004
F1 tornado, Vincennes to Montrose, Iowa, May 30, 2004
From Vincennes to Montrose, this F1 tornado ran 0.5 miles across Lee County on May 30, 2004, touching down at 2:30 PM CDT and reaching 70 yards wide. It killed nobody, and did $20,000 of property damage.
The rating scale
Tracks are drawn in the color of the rating. The Fujita scale rates the damage rather than measuring the wind: the speeds are what that damage is taken to imply.
F040 to 72 mph
Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.
F173 to 112 mphthis tornado
Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.
F2113 to 157 mph
Considerable damage. Roofs torn off well-built houses, frame homes shifted on their foundations, mobile homes destroyed, large trees snapped or uprooted, cars lifted off the ground.
F3158 to 206 mph
Severe damage. Whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, trees debarked, heavy cars lifted and thrown.
F4207 to 260 mph
Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.
F5261 to 318 mph
Incredible damage. Strong frame houses swept off their foundations, car-sized missiles thrown more than 100 meters, steel-reinforced concrete badly damaged, high-rise buildings deformed.
Unrated
The survey recorded a tornado but could not put a number on it, most often because it crossed open country and damaged nothing a rating can be read from.
The record
- Rating
- F1
- Date
- May 30, 2004
- Touchdown
- 2:30 PM CDT (19:30 UTC)
- Path length
- 0.5 miles (0.8 km)
- Path width
- 70 yards (64 m)
- Deaths
- 0
- Injuries
- 0
- Property damage
- $20,000
- County
- Lee County
- Touchdown point
- 40.520, -91.430
- Lift-off point
- 40.530, -91.420
- Record number
- 374
What the Weather Service recorded
Tornado was the first of 4 that developed out of a cyclic supercell in Lee County Iowa. Tornado touched down north of 320th Street just east of the Shafer Farm and moved generally east causing tree damage.
Second tornado from cyclic supercell developed in the creek bottoms of Little Sugar Creek and moved generally east. It hit the Jim Newsbaum Farm destroying an outbuilding and machine shed and causing considerable tree damage.
Third tornado of the cyclic Lee supercell developed in the bottom land west of 223rd Avenue and moved generally east hitting the property of the Eastman Residence on Ambrosia Lane. Numerous trees were downed with a satellite dish crumpled and a picnic table thrown. A gas grill was tossed into car damaging its side.
The fourth and final tornado in the cyclic Lee County supercell developed just east of the Bardlow Farm and moved east northeast to the edge of Montrose before dissipating. Numerous trees and power lines were downed with a garage being totally destroyed. A barn had its roof lifted, slightly twisted, and then set back down on the parent structure. If the tornado have gone another two blocks, it would have moved into a residential area of Montrose.
Tree damage
Rated F1
Rated very high end F0
Rated F1
From NOAA NCEI's Storm Events Database, the narrative the local forecast office wrote for Storm Data.
The warnings
1 minute of warning. NWS DVN issued a tornado warning for this county at 19:29 UTC, 1 minute before the tornado touched down, in force until 20:15 UTC.
| Issued (UTC) | Expired | Product | Office |
|---|---|---|---|
| 19:18 UTC | 20:00 UTC | Severe Thunderstorm Warning | DVN |
| 19:29 UTC | 20:15 UTC | Tornado Warning | DVN |
| 19:47 UTC | 01:00 UTC | Flash Flood Warning | DVN |
Every warning and watch covering the touchdown point that day, from the Iowa Environmental Mesonet's archive of National Weather Service products. Lead time is measured from the issue of the warning in force to the touchdown time in the database, both of which were recorded to the minute by different people.
The forecast that day
The Storm Prediction Center had this point in a Moderate Risk, with a 0.25 chance of a tornado within 25 miles. The outlook in force was issued at 16:38 UTC.
SPC's Day 1 convective outlook as it stood when the tornado began, read at the touchdown point. The same archive is on the radar archive.
The surface observations
Keokuk Municipal (EOK), 7 km from the path, in the two hours either side.
| Time (UTC) | Temp (°F) | Dew point (°F) | Wind | Gust (kt) | Pressure (mb) | Weather |
|---|---|---|---|---|---|---|
| 17:40 UTC | 80 | 74 | 180° 11 kt | 16 | 998.6 | |
| 18:00 UTC | 81 | 75 | 160° 12 kt | 16 | 998.3 | |
| 18:20 UTC | 83 | 76 | 180° 11 kt | 17 | 997.6 | |
| 18:40 UTC | 83 | 76 | 160° 10 kt | 13 | 997.3 | |
| 19:00 UTC | 83 | 77 | 160° 12 kt | 16 | 997.3 | |
| 19:20 UTC | 84 | 77 | 160° 8 kt | 996.6 | ||
| 19:40 UTC | 76 | 69 | 250° 29 kt | 45 | 998 | |
| 20:00 UTC | 66 | 61 | 300° 13 kt | 18 | 997.6 | |
| 20:20 UTC | 66 | 62 | 0° 0 kt | 997 | ||
| 20:40 UTC | 67 | 63 | 0° 0 kt | 997.3 | ||
| 21:00 UTC | 69 | 64 | 200° 5 kt | 997.3 | ||
| 21:20 UTC | 69 | 65 | 230° 5 kt | 997.3 |
From the Iowa Environmental Mesonet's archive of airport observations.
The radar
The Quad Cities radar (KDVN), 140 km away, was scanning. The volume nearest the touchdown began at 19:31 UTC.
Open the radar archive at this moment, over the track
Reflectivity and velocity, decoded from the Level II archive in the browser. Volumes take a few seconds to open the first time.
This ground now
The live radar over the trackEvery 2004 tornado in IowaEvery tornado in Iowa since 1950Warnings in force in Iowa nowThe forecast where you are
The other tornadoes of May 30, 2004
80 more were confirmed in the United States that day.
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|---|---|---|---|---|---|---|---|
| May 30 | 1:42 AM CDT | F0 | Wagoner, OK | 3.5 | 300 | $10,000 | ||
| May 30 | 1:51 AM CDT | F1 | Mayes, OK | 7.2 | 600 | $30,000 | ||
| May 30 | 6:45 AM CDT | F1 | Grundy, TN | 1.0 | 10 | $30,000 | ||
| May 30 | 9:37 AM CDT | F0 | Tazewell, IL | 0.1 | 10 | |||
| May 30 | 12:15 PM CDT | F0 | McCracken, KY | 1.5 | 50 | $20,000 | ||
| May 30 | 1:05 PM EST | F1 | Owen, IN | 8.4 | 75 | $300,000 | ||
| May 30 | 1:33 PM EST | F0 | Fountain, IN | 0.1 | 30 | |||
| May 30 | 2:09 PM EST | F1 | Monroe, IN | 7.0 | 75 | $250,000 | ||
| May 30 | 2:18 PM CDT | F0 | Lee, IA | 0.3 | 40 | $3,000 | ||
| May 30 | 2:22 PM CDT | F0 | Todd, KY | 0.5 | 50 | |||
| May 30 | 2:23 PM CDT | F1 | Lee, IA | 0.3 | 70 | $20,000 | ||
| May 30 | 2:25 PM EST | F3 | Crawford, IN | 15.0 | 400 | 1 | 11 | $5.0 million |
| May 30 | 2:26 PM CDT | F0 | Lee, IA | 0.3 | 40 | $10,000 | ||
| May 30 | 3:30 PM EDT | F1 | Clark, IN | 2.0 | 10 | $500,000 | ||
| May 30 | 3:40 PM EDT | F0 | Floyd, IN | 3.8 | 10 | |||
| May 30 | 2:40 PM CDT | F2 | Hopkins, KY | 7.0 | 175 | $300,000 | ||
| May 30 | 3:10 PM EST | F1 | Washington, IN | 10.6 | 30 | $120,000 | ||
| May 30 | 3:12 PM CDT | F0 | Daviess, KY | 0.1 | 30 | |||
| May 30 | 3:23 PM CDT | F0 | Shannon, MO | 0.1 | 50 | |||
| May 30 | 3:28 PM CDT | F0 | Benton, IA | 0.2 | 40 | |||
| May 30 | 3:35 PM CDT | F0 | Sherburne, MN | 0.5 | 30 | |||
| May 30 | 3:36 PM CDT | F1 | Iowa, IA | 0.2 | 50 | $10,000 | ||
| May 30 | 3:50 PM CDT | F0 | Buchanan, IA | 0.2 | 30 | |||
| May 30 | 3:51 PM CDT | F0 | Buchanan, IA | 0.3 | 40 | $10,000 | ||
| May 30 | 3:53 PM CDT | F1 | Laclede, MO | 1.0 | 200 | $10,000 | ||
| May 30 | 3:56 PM CDT | F0 | Jones, IA | 0.3 | 30 | |||
| May 30 | 4:05 PM CDT | F1 | Madison, IL | 2.0 | 70 | |||
| May 30 | 5:27 PM EDT | F0 | Jefferson, KY | 0.3 | 30 | $100,000 | ||
| May 30 | 4:50 PM CDT | F1 | Clinton, IL | 7.0 | 80 | |||
| May 30 | 4:55 PM EST | F0 | Clay, IN | 0.1 | 25 | |||
| May 30 | 5:05 PM CDT | F1 | Woodford, IL | 9.0 | 75 | |||
| May 30 | 5:10 PM CDT | F0 | Fayette, IL | 0.1 | 40 | |||
| May 30 | 5:20 PM CDT | F1 | Saint Louis, MO | 2.0 | 50 | 1 | $100,000 | |
| May 30 | 5:45 PM CDT | F0 | Reynolds, MO | 0.1 | 40 | |||
| May 30 | 5:57 PM CDT | F0 | Logan, IL | 0.1 | 40 | 3 | $250,000 | |
| May 30 | 6:00 PM EST | F0 | Morgan, IN | 0.1 | 50 | $10,000 | ||
| May 30 | 7:05 PM EDT | F0 | Powell, KY | 0.1 | 17 | |||
| May 30 | 6:10 PM EST | F1 | Morgan, IN | 5.0 | 75 | $20,000 | ||
| May 30 | 6:11 PM CDT | F1 | Livingston, IL | 12.0 | 50 | |||
| May 30 | 6:12 PM CDT | F0 | Livingston, IL | 0.2 | 20 | |||
| May 30 | 6:24 PM CDT | F1 | Washington, IL | 4.5 | 70 | |||
| May 30 | 6:25 PM CDT | F1 | Washington, IL | 3.5 | 80 | |||
| May 30 | 6:25 PM CDT | F1 | Perry, IL | 12.0 | 75 | $250,000 | ||
| May 30 | 6:26 PM CDT | F1 | Washington, IL | 4.0 | 100 | |||
| May 30 | 6:27 PM CDT | F1 | Washington, IL | 4.5 | 70 | |||
| May 30 | 6:28 PM CDT | F1 | Washington, IL | 18.5 | 75 | $100,000 | ||
| May 30 | 6:30 PM EST | F0 | Hendricks, IN | 0.8 | 50 | |||
| May 30 | 6:32 PM CDT | F0 | Livingston, IL | 0.2 | 20 | |||
| May 30 | 6:32 PM CDT | F0 | Jackson, IL | 0.5 | 50 | |||
| May 30 | 6:32 PM EST | F0 | Hendricks, IN | 4.1 | 75 | |||
| May 30 | 6:40 PM CDT | F0 | Livingston, IL | 1.0 | 20 | |||
| May 30 | 7:00 PM CDT | F1 | Nevada, AR | 10.0 | 100 | $80,000 | ||
| May 30 | 7:00 PM EST | F2 | Marion, IN | 20.0 | 100 | 26 | $19 million | |
| May 30 | 7:13 PM CDT | F0 | Clay, IL | 0.2 | 50 | |||
| May 30 | 7:19 PM CDT | F0 | Clay, IL | 0.2 | 50 | |||
| May 30 | 7:26 PM EST | F0 | Tippecanoe, IN | 0.1 | 20 | |||
| May 30 | 7:28 PM CDT | F0 | Goodhue, MN | 0.5 | 25 | |||
| May 30 | 7:28 PM CDT | F0 | Chisago, MN | 0.3 | 25 | |||
| May 30 | 7:29 PM EST | F2 | Tippecanoe, IN | 1.8 | 75 | $1.0 million | ||
| May 30 | 7:32 PM CDT | F0 | Newton, IN | 2.5 | 20 |
What this means
Ratings are the survey's, read off the damage rather than measured; the rating scale is above. Tornado counts rise through the record as reporting improved, so a year in the 1950s is not comparable with one today except for the strongest tornadoes, which were always noticed.
Sources
NOAA Storm Prediction Center tornado database, 1950-2025, the official record kept by NOAA's Storm Prediction Center.