Alert archive / Iowa / Tornado Warnings in 2001
Tornado Warning 67, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at Aug 17, 2001, 5:37 PM CDT for Cherokee County, Iowa. It was in force for 23 min. No storm report in the archive falls 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.
The facts
- Issued
- Aug 17, 2001, 5:37 PM CDT (22:37 UTC)
- Expired
- Aug 17, 2001, 6:00 PM CDT
- In force
- 23 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Cherokee County, IA
The radar
The Sioux Falls radar (KFSD), 115 km from the middle of the area, began a volume at 22:38 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.
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, 10.6 hours before the alert went out and 175 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.
515 WFUS53 KFSD 172238 TORFSD IAC035-172300- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 537 PM CDT FRI AUG 17 2001 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * TORNADO WARNING FOR... WESTERN CHEROKEE COUNTY IN NORTHWEST IOWA * UNTIL 600 PM CDT * AT 537 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A TORNADO 6 MILES WEST OF MARCUS...OR ABOUT 12 MILES EAST OF LE MARS...MOVING EAST AT 25 MPH. * THE TORNADO WILL BE NEAR... MARCUS AROUND 545 PM CDT CLEGHORN AROUND 555 PM CDT A TRAINED WEATHER SPOTTER REPORTED A TORNADO NEAR REMSEN AT 534 PM CDT. THIS IS AN EXTREMELY DANGEROUS AND LIFE THREATENING SITUATION. TAKE COVER NOW. LAT...LON 4290 9586 4278 9587 4271 9562 4287 9562
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, 5:43 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.