Alert archive / Iowa / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 9, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 7, 2001, 3:05 AM CDT for Lyon County, O'Brien County, Osceola County, Iowa; Nobles County, Rock County, Minnesota. It was in force for 25 min. 4 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Apr 7, 2001, 3:05 AM CDT (08:05 UTC)
- Expired
- Apr 7, 2001, 3:30 AM CDT
- In force
- 25 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Lyon County, IA, O'Brien County, IA, Osceola County, IA, Nobles County, MN, Rock County, MN
The radar
The Sioux Falls radar (KFSD), 69 km from the middle of the area, began a volume at 08:04 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 |
|---|---|---|---|
| Apr 7, 3:15 AM CDT | Thunderstorm Wind 52 E | Little Rock, IA | |
| Apr 7, 3:25 AM CDT | Thunderstorm Wind 52 E | Sibley, IA | |
| Apr 7, 3:25 AM CDT | Thunderstorm Wind 52 E | Sheldon, IA | |
| Apr 7, 3:29 AM CDT | Thunderstorm Wind 52 E | Adrian, MN |
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 |
|---|---|---|---|
| Apr 7, 1:45 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 8.1 hours before the alert went out and 239 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
- 770 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 454 m above ground
- 0-6 km bulk shear
- 78 kt
- 0-1 km storm-relative helicity
- 205 m²/s²
- 0-3 km storm-relative helicity
- 278 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.9
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS53 KFSD 070805 RRA SVRFSD IAC119-141-143-MNC105-133-070830- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 305 AM CDT SAT APR 7 2001 THE NATIONAL WEATHER SERVICE
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 7, 2:11 AM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 34 min |
| Apr 7, 2:22 AM CDT | Severe Thunderstorm Warning | FSD | Lyon, Sioux | 38 min |
| Apr 7, 3:29 AM CDT | Severe Thunderstorm Warning | FSD | Nobles | 31 min |
| Apr 7, 3:51 AM CDT | Tornado Warning | FSD | Murray, Nobles | 24 min |
| Apr 7, 4:23 AM CDT | Severe Thunderstorm Warning | FSD | Murray | 37 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2001Severe Thunderstorm Warnings in Minnesota, 2001Every severe thunderstorm warning 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.