Alert archive / Iowa / Tornado Warnings in 2001
Tornado Warning 72, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at Aug 17, 2001, 6:39 PM CDT for Ida County, Woodbury County, Iowa. It was in force for 51 min. 7 reports 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, 6:39 PM CDT (23:39 UTC)
- Expired
- Aug 17, 2001, 7:30 PM CDT
- In force
- 51 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Ida County, IA, Woodbury County, IA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 17, 6:53 PM CDT | Hail 0.75 | Pierson, IA | |
| Aug 17, 7:06 PM CDT | Hail 1.75 | Correctionville, IA | |
| Aug 17, 7:08 PM CDT | Hail 1.75 | Correctionville, IA | |
| Aug 17, 7:25 PM CDT | Tornado F0 | Danbury, IA | A brief tornado caused no reported damage. |
| Aug 17, 7:30 PM CDT | Hail 0.75 | Ida Grove, IA | |
| Aug 17, 7:30 PM CDT | Hail 1 | Danbury, IA | |
| Aug 17, 7:35 PM CDT | Hail 0.88 | Battle Creek, IA |
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, 11.7 hours before the alert went out and 134 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.
799 WFUS53 KFSD 172340 TORFSD IAC093-193-180030- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 639 PM CDT FRI AUG 17 2001 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * TORNADO WARNING FOR... WESTERN IDA COUNTY IN NORTHWEST IOWA EASTERN WOODBURY COUNTY IN NORTHWEST IOWA * UNTIL 730 PM CDT * AT 639 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A TORNADO 6 MILES NORTH OF PIERSON...OR ABOUT 18 MILES SOUTHEAST OF LE MARS...MOVING SOUTHEAST AT 40 MPH. * THE TORNADO WILL BE NEAR... PIERSON AROUND 645 PM CDT CORRECTIONVILLE AROUND 655 PM CDT ANTHON...CUSHING AROUND 700 PM CDT BATTLE CREEK AROUND 715 PM CDT DANBURY AROUND 720 PM CDT IF YOU ARE IN THE PATH OF THIS TORNADO...TAKE COVER IMMEDIATELY. FUNNEL CLOUDS WERE REPORTED JUST NORTH OF KINGSLEY AT 638 PM. LAT...LON 4256 9570 4256 9599 4222 9582 4223 9549
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, 5:30 PM CDT | Tornado Warning | FSD | Plymouth | 30 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, 6:44 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.