Alert archive / South Dakota / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 347, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 20, 2002, 7:25 PM CDT for Aurora County, South Dakota. It was in force for 35 min. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 20, 2002, 7:25 PM CDT (00:25 UTC)
- Expired
- Aug 20, 2002, 8:00 PM CDT
- In force
- 35 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Counties, with a storm outline in the text
County Aurora County, SD
The radar
The Sioux Falls radar (KFSD), 143 km from the middle of the area, began a volume at 00:24 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 |
|---|---|---|---|
| Aug 20, 7:32 PM CDT | Hail 0.75 | Plankinton, SD | |
| Aug 20, 7:57 PM CDT | Hail 0.75 | Mt Vernon, SD |
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 20, 2:35 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 0.4 hours before the alert went out and 121 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
- 1 J/kg
- Mixed-layer CIN
- -265 J/kg
- Mixed-layer LCL
- 857 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 90 m²/s²
- 0-3 km storm-relative helicity
- 256 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted, in the capitals the NWS used until 2016.
897 WUUS53 KFSD 210025 SVRFSD SDC003-210100- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 725 PM CDT TUE AUG 20 2002 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... AURORA COUNTY IN SOUTHEAST SOUTH DAKOTA * UNTIL 800 PM CDT * AT 725 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 8 MILES NORTH OF PLANKINTON...OR ABOUT 21 MILES WEST OF MITCHELL...MOVING EAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... RURAL AURORA COUNTY THROUGH 740 PM CDT THIS STORM WILL PRODUCE LARGE HAIL. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS. LAT...LON 4389 9858 4368 9860 4368 9833 4393 9834 BOUSTEAD
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 7:17 PM CDT | Severe Thunderstorm Warning | FSD | Davison, Sanborn | 43 min |
| Aug 20, 7:48 PM CDT | Severe Thunderstorm Warning | FSD | Gregory | 42 min |
| Aug 20, 8:25 PM CDT | Severe Thunderstorm Warning | FSD | Hanson | 50 min |
| Aug 20, 8:31 PM CDT | Severe Thunderstorm Warning | FSD | Davison | 29 min |
| Aug 20, 8:47 PM CDT | Severe Thunderstorm Warning | FSD | Lake, Miner | 43 min |
| Aug 20, 9:02 PM CDT | Severe Thunderstorm Warning | FSD | McCook | 43 min |
| Aug 20, 9:10 PM CDT | Tornado Warning | FSD | Hanson | 35 min |
| Aug 20, 9:10 PM CDT | Tornado Warning | FSD | Hanson | 35 min |
| Aug 20, 9:17 PM CDT | Severe Thunderstorm Warning | FSD | Aurora | 43 min |
| Aug 20, 9:25 PM CDT | Severe Thunderstorm Warning | FSD | Douglas | 50 min |
| Aug 20, 9:42 PM CDT | Flash Flood Warning | FSD | Aurora, Davison | 108 min |
| Aug 20, 9:42 PM CDT | Severe Thunderstorm Warning | FSD | Minnehaha | 63 min |
| Aug 20, 9:44 PM CDT | Severe Thunderstorm Warning | FSD | McCook | 46 min |
| Aug 20, 10:11 PM CDT | Severe Thunderstorm Warning | FSD | Hutchinson | 49 min |
| Aug 21, 7:46 AM CDT | Flash Flood Warning | FSD | Minnehaha | 119 min |
| Aug 21, 6:54 PM CDT | Severe Thunderstorm Warning | FSD | Gregory | 51 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 2002Every severe thunderstorm warning in 2002
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.