Tornadoes · United States · Minnesota · 2004
F0 tornado, Clarissa to Browerville, Minnesota, August 29, 2004
From Clarissa to Browerville, this F0 tornado ran 0.1 miles across Todd County on August 29, 2004, touching down at 7:00 PM CDT and reaching 30 yards wide. It killed nobody.
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 mphthis tornado
Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.
F173 to 112 mph
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
- F0
- Date
- August 29, 2004
- Touchdown
- 7:00 PM CDT (00:00 UTC)
- Path length
- 0.1 miles (0.2 km)
- Path width
- 30 yards (27 m)
- Deaths
- 0
- Injuries
- 0
- County
- Todd County
- Touchdown point
- 46.050, -94.850
- Lift-off point
- 46.050, -94.850
- Record number
- 1536
What the Weather Service recorded
An off-duty police officer witnessed a brief touchdown of a tornado near the intersection of county routes 11 and 14. No damage was reported.
An off-duty emergency manager witnessed a brief touchdown of a tornado 3 miles south of Browerville, 1/2 mile east of Highway 71. No damage was reported.
From NOAA NCEI's Storm Events Database, the narrative the local forecast office wrote for Storm Data.
The warnings
4 minutes of warning. NWS MPX issued a tornado warning for this county at 23:56 UTC, 4 minutes before the tornado touched down, in force until 00:30 UTC.
| Issued (UTC) | Expired | Product | Office |
|---|---|---|---|
| 23:56 UTC | 00:30 UTC | Tornado Warning | MPX |
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 Slight Risk. The outlook in force was issued at 20:02 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 air that afternoon
The radiosonde launches on either side of the tornado, from the nearest station that was launching then, drawn and analyzed the way Storm Lab does: the same diagram, the same parcel and shear definitions SPC's mesoanalysis uses.
Minneapolis, MN (KMPX), 00:00Z
0.0 hours before the tornado, 165 km from the path. August 30, 2004.
- Mixed-layer CAPE
- 196 J/kg
- Mixed-layer CIN
- -28 J/kg
- Surface CAPE
- 366 J/kg
- Mixed-layer LCL
- 832 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 155 m²/s²
- 0-3 km storm-relative helicity
- 275 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.1
- 0-3 km lapse rate
- 6.2 K/km
Minneapolis, MN (KMPX), 12:00Z
12.0 hours after it, 165 km from the path. August 30, 2004.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- -80062 J/kg
- Surface CAPE
- 0 J/kg
- Mixed-layer LCL
- 1567 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 72 m²/s²
- 0-3 km storm-relative helicity
- 111 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
- 0-3 km lapse rate
- 3.5 K/km
The surface observations
Staples (SAZ), 37 km from the path, in the two hours either side.
| Time (UTC) | Temp (°F) | Dew point (°F) | Wind | Gust (kt) | Pressure (mb) | Weather |
|---|---|---|---|---|---|---|
| 22:00 UTC | 66.2 | 62.6 | 150° 5 kt | 1013.5 | ||
| 22:15 UTC | 66.2 | 62.6 | 160° 8 kt | 1012.9 | ||
| 22:35 UTC | 66.2 | 62.6 | 150° 8 kt | 1012.9 | ||
| 23:00 UTC | 66.2 | 64.4 | 160° 7 kt | 14 | 1012.5 | |
| 23:15 UTC | 66.2 | 62.6 | 160° 8 kt | 1012.5 | ||
| 23:35 UTC | 66.2 | 64.4 | 160° 7 kt | 1012.5 | ||
| 00:00 UTC | 66.2 | 64.4 | 160° 8 kt | 1012.2 | ||
| 00:15 UTC | 66.2 | 62.6 | 160° 9 kt | 1012.5 | ||
| 00:35 UTC | 64.4 | 62.6 | 160° 10 kt | 1012.5 | ||
| 01:00 UTC | 64.4 | 62.6 | 150° 5 kt | 1012.5 | ||
| 01:15 UTC | 62.6 | 62.6 | 160° 5 kt | 1012.9 | ||
| 01:35 UTC | 62.6 | 62.6 | 150° 4 kt | 1012.9 |
From the Iowa Environmental Mesonet's archive of airport observations.
The radar
The Minneapolis radar (KMPX), 167 km away, was scanning. The volume nearest the touchdown began at 00:03 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.
What was reported nearby
Local storm reports within 60 km of the path, in the three hours either side.
| Time (UTC) | Report | Where | County | Remark |
|---|---|---|---|---|
| 23:47 UTC | TORNADO | 3 S Clarissa | Todd, MN | BRIEF TOUCHDOWN WITNESSED BY OFF DUTY POLICE OFFICER. THIS WAS THE TORNADO THAT HAD BEEN REPORTED AS BEING 5 MILES NORTH OF LONG PRAIRIE. |
| 23:47 UTC | TORNADO | 3 S Clarissa | Todd, MN | BRIEF TOUCHDOWN WITNESSED BY OFF DUTY POLICE OFFICER. THIS WAS THE TORNADO THAT HAD BEEN REPORTED AS BEING 5 MILES NORTH OF LONG PRAIRIE. |
| 00:00 UTC | HAIL 1 | Browerville | Todd, MN | HAIL SWATH WAS ONE MILE WIDE FROM BROWERVILLE TO 10 MILES EAST OF BROWERVILLE. |
| 00:00 UTC | TORNADO | 3 Sse Browerville | Todd, MN | BRIEF TOUCHDOWN 3 MILES SOUTH OF BROWERVILLE AND 1/2 MILE EAST OF HIGHWAY 71. NO DAMAGE. |
| 00:00 UTC | TORNADO | 3 Sse Browerville | Todd, MN | BRIEF TOUCHDOWN 3 MILES SOUTH OF BROWERVILLE AND 1/2 MILE EAST OF HIGHWAY 71. NO DAMAGE. |
| 00:28 UTC | TORNADO | 9 E Long Prairie | Todd, MN | BRIEF TOUCHDOWN. |
| 00:28 UTC | TORNADO | 9 E Long Prairie | Todd, MN | BRIEF TOUCHDOWN. |
| 00:30 UTC | HAIL 0.75 | 4 Sw Randall | Morrison, MN | HAIL SWATH THAT BEGAN IN BROWERVILLE CONTINUED INTO MORRISON COUNTY. UNKNOWN HOW FAR HAIL SWATH CONTINUED BEYOND 4 SW RANDALL. |
| 01:55 UTC | HAIL 0.75 | 4 Nw Deer Creek | Otter Tail, MN |
From the Iowa Environmental Mesonet's archive of National Weather Service local storm reports.
This ground now
The live radar over the trackEvery 2004 tornado in MinnesotaEvery tornado in Minnesota since 1950Warnings in force in Minnesota nowThe forecast where you are
The other tornadoes of August 29, 2004
6 more were confirmed in the United States that day.
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.