Alert archive / South Dakota / Severe Thunderstorm Warnings in 2004
Severe Thunderstorm Warning 151, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at May 21, 2004, 10:14 PM CDT for Union County, South Dakota; Plymouth County, Iowa. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- May 21, 2004, 10:14 PM CDT (03:14 UTC)
- Expired
- May 21, 2004, 10:45 PM CDT
- In force
- 31 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Counties, with a storm outline in the text
Counties Plymouth County, IA, Union County, SD
The radar
The Sioux Falls radar (KFSD), 83 km from the middle of the area, began a volume at 03:15 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 |
|---|---|---|---|
| May 21, 9:55 PM CDT | Tornado Watch | SPC | 4 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 3.2 hours before the alert went out and 172 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
- 2589 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 1462 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 64 m²/s²
- 0-3 km storm-relative helicity
- 166 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 6.9
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS53 KFSD 220313 SVRFSD SDC083-220400- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 1013 PM CDT FRI MAY 21 2004 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... LINCOLN COUNTY IN SOUTHEAST SOUTH DAKOTA * UNTIL 1100 PM CDT * AT 1010 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 18 MILES SOUTH OF LENNOX...OR ABOUT 8 MILES WEST OF BERESFORD...MOVING NORTH AT 25 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... WORTHING...LENNOX AROUND 1055 PM CDT THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS. LAT...LON 4310 9693 4311 9677 4338 9670 4339 9691 $$ PS
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 7:50 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Union | 40 min |
| May 21, 8:08 PM CDT | Tornado Warning | FSD | Union | 37 min |
| May 21, 9:12 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Yankton | 33 min |
| May 21, 9:22 PM CDT | Tornado Warning | FSD | Clay, Yankton | 23 min |
| May 21, 9:47 PM CDT | Tornado Warning | FSD | Clay, Union | 28 min |
| May 21, 10:13 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln | 47 min |
| May 21, 10:28 PM CDT | Severe Thunderstorm Warning | FSD | Turner | 32 min |
| May 21, 11:24 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Minnehaha | 36 min |
| May 21, 8:19 PM CDT | Tornado Warning | FSD | Plymouth | 41 min |
| May 21, 8:37 PM CDT | Severe Thunderstorm Warning | FSD | Clay, O'Brien | 23 min |
| May 21, 8:56 PM CDT | Tornado Warning | FSD | Plymouth | 49 min |
| May 21, 9:25 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee | 35 min |
| May 21, 9:33 PM CDT | Severe Thunderstorm Warning | FSD | Clay | 27 min |
| May 21, 9:33 PM CDT | Severe Thunderstorm Warning | FSD | O'Brien | 42 min |
| May 21, 9:59 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Woodbury | 31 min |
| May 21, 10:12 PM CDT | Severe Thunderstorm Warning | FSD | Clay | 33 min |
| May 21, 10:29 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 16 min |
| May 21, 11:07 PM CDT | Severe Thunderstorm Warning | FSD | Ida, Woodbury | 23 min |
| May 21, 11:50 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 25 min |
| May 22, 12:03 AM CDT | Flash Flood Warning | FSD | Cherokee, Clay, O'Brien, Plymouth | 87 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 2004Severe Thunderstorm Warnings in Iowa, 2004Every severe thunderstorm warning in 2004
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.