Alert archive / Iowa / Tornado Warnings in 2001
Tornado Warning 66, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at Aug 17, 2001, 5:30 PM CDT for Plymouth County, Iowa. It was in force for 30 min. 1 report came from inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.
The facts
- Issued
- Aug 17, 2001, 5:30 PM CDT (22:30 UTC)
- Expired
- Aug 17, 2001, 6:00 PM CDT
- In force
- 30 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Plymouth County, IA
The radar
The Sioux Falls radar (KFSD), 106 km from the middle of the area, began a volume at 22:32 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 17, 5:34 PM CDT | Tornado F0 | Remsen, IA | A brief tornado caused no reported damage. |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 17, 5:30 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 10.5 hours before the alert went out and 163 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1475 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- -21 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
252 WFUS53 KFSD 172230 TORFSD IAC149-172300- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 530 PM CDT FRI AUG 17 2001 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * TORNADO WARNING FOR... EASTERN PLYMOUTH COUNTY IN NORTHWEST IOWA * UNTIL 600 PM CDT * AT 530 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A TORNADO 4 MILES EAST OF LE MARS...MOVING SOUTHEAST AT 20 MPH. * THE TORNADO WILL BE NEAR... REMSEN AROUND 535 PM CDT LAT...LON 4289 9609 4275 9626 4257 9599 4275 9587
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 4:07 PM CDT | Severe Thunderstorm Warning | FSD | Lyon | 23 min |
| Aug 17, 4:27 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Sioux | 33 min |
| Aug 17, 4:57 PM CDT | Severe Thunderstorm Warning | FSD | Sioux | 33 min |
| Aug 17, 5:04 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Plymouth | 26 min |
| Aug 17, 5:15 PM CDT | Tornado Warning | FSD | Sioux | 30 min |
| Aug 17, 5:22 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 23 min |
| Aug 17, 5:28 PM CDT | Tornado Warning | FSD | Woodbury | 32 min |
| Aug 17, 5:37 PM CDT | Tornado Warning | FSD | Cherokee | 23 min |
| Aug 17, 5:43 PM CDT | Tornado Warning | FSD | Sioux | 32 min |
| Aug 17, 5:55 PM CDT | Tornado Warning | FSD | Cherokee, Plymouth | 50 min |
| Aug 17, 5:55 PM CDT | Tornado Warning | FSD | Woodbury | 35 min |
| Aug 17, 6:30 PM CDT | Tornado Warning | FSD | Woodbury | 15 min |
| Aug 17, 6:39 PM CDT | Tornado Warning | FSD | Ida, Woodbury | 51 min |
| Aug 17, 6:44 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Plymouth | 16 min |
Nearby
Tornado Warnings in Iowa, 2001Every tornado warning in 2001Tornadoes in 2001
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.