Alert archive / Iowa / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 5, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 7, 2001, 2:11 AM CDT for Union County, South Dakota; Plymouth County, Woodbury County, Iowa; Dakota County, Nebraska. It was in force for 34 min. 3 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
- Apr 7, 2001, 2:11 AM CDT (07:11 UTC)
- Expired
- Apr 7, 2001, 2:45 AM CDT
- In force
- 34 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Plymouth County, IA, Woodbury County, IA, Dakota County, NE, Union County, SD
The radar
The Sioux Falls radar (KFSD), 113 km from the middle of the area, began a volume at 07:12 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, 2:13 AM CDT | Thunderstorm Wind 52 E | Sioux City, IA | |
| Apr 7, 2:20 AM CDT | Thunderstorm Wind 52 E | North Sioux City, SD | Thunderstorm winds caused tree and power line damage, resulting in power outages in parts of the county. The winds also destroyed a silo, blew out the wall of a barn, the roof of a shed, windows on the south side of a house, and damaged road signs and outbuild |
| Apr 7, 2:30 AM CDT | Thunderstorm Wind 52 M | Le Mars Muni Arpt, 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 |
|---|---|---|---|
| Apr 7, 1:45 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 7.2 hours before the alert went out and 141 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 070712 SVRFSD IAC149-193-NEC043-051-SDC127-070745- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 211 AM CDT SAT APR 7 2001 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... DAKOTA COUNTY IN NORTHEAST NEBRASKA DIXON COUNTY IN NORTHEAST NEBRASKA PLYMOUTH COUNTY IN NORTHWEST IOWA WOODBURY COUNTY IN NORTHWEST IOWA UNION COUNTY IN SOUTHEAST SOUTH DAKOTA * UNTIL 245 AM CDT * AT 211 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER JACKSON...OR ABOUT 8 MILES SOUTHWEST OF SIOUX CITY...MOVING NORTH AT 40 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... JEFFERSON AROUND 220 AM CDT ELK POINT...HINTON AROUND 225 AM CDT MERRILL AROUND 235 AM CDT AKRON...LE MARS AROUND 240 AM CDT LAW ENFORCEMENT IN DAKOTA COUNTY REPORTED WINDS IN EXCESS OF 70 MPH AT 208 AM. : THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WIND. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS. LAT...LON 4243 9672 4235 9630 4278 9614 4292 9679
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 6, 9:17 PM CDT | Severe Thunderstorm Warning | FSD | Kingsbury, Miner | 28 min |
| Apr 6, 9:45 PM CDT | Severe Thunderstorm Warning | FSD | Charles Mix, Gregory | 30 min |
| Apr 7, 2:22 AM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Minnehaha | 38 min |
| Apr 7, 2:22 AM CDT | Severe Thunderstorm Warning | FSD | Moody | 38 min |
| Apr 7, 3:05 AM CDT | Severe Thunderstorm Warning | FSD | Lyon, O'Brien, Osceola | 25 min |
| Apr 7, 2:11 AM CDT | Severe Thunderstorm Warning | FSD | Dixon | 34 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2001Severe Thunderstorm Warnings in South Dakota, 2001Severe Thunderstorm Warnings in Nebraska, 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.