Alert archive / South Dakota / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 86, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 24, 1997, 9:08 PM CDT for Beadle County, Kingsbury County, South Dakota. It was in force for 47 min. 1 report 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
- Jul 24, 1997, 9:08 PM CDT (02:08 UTC)
- Expired
- Jul 24, 1997, 9:55 PM CDT
- In force
- 47 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Beadle County, SD, Kingsbury County, SD
The radar
The Aberdeen radar (KABR), 125 km from the middle of the area, began a volume at 02:12 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 |
|---|---|---|---|
| Jul 24, 9:46 PM CDT | Tornado F0 | De Smet, SD | A brief tornado in an open area resulted in no reported damage. |
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 nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 2.1 hours before the alert went out and 70 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
- 2516 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 877 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 50 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFSD 250209 RRA SVRFSD SDC005-077-250255- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 908 PM CDT THU JUL 24 1997 * SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BEADLE COUNTY IN EASTCENTRAL SOUTH DAKOTA WESTERN KINGSBURY COUNTY IN EASTCENTRAL SOUTH DAKOTA * UNTIL 955 PM CDT * SOME AREAS AFFECTED IROQUOIS AROUND 925 PM CDT MANCHESTER AROUND 935 PM CDT * AT 906 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 16 MILES EAST OF HURON OR 6 MILES SOUTH OF IROQUOIS MOVING NORTH AT 15 MPH. IF YOU ARE OUTDOORS...MOVE TO A PLACE OF SHELTER IMMEDIATELY IF A STORM APPROACHES. MOTORISTS SHOULD REMAIN ALERT FOR REDUCED VISIBILITIES DURING DOWNPOURS OF RAIN. STREETS MAY FLOOD QUICKLY. UMLAND
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 24, 8:32 PM CDT, 36 minutes earlier.
Area forecast discussion, Jul 24, 8:32 PM CDT, 36 minutes before
SOUTH DAKOTA/NORTHWEST IOWA/SOUTHWEST MINNESOTA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SIOUX FALLS SD 832 PM CDT THU JUL 24 1997 NEXRAD RADAR AT SIOUX FALLS SHOWS SMALL CLUSTERS OF THUNDERSTORMS DVLPG JUST S OF LAKE ANDES...JUST N OF HURON AND AROUND THE SIOUX FALLS AREA. NEXRAD RADAR AT SIOUX FALLS HAS SHOWN SEVERE SIGNATURES WITH SOME OF THESE THUNDERSTORMS. FORECASTS ATTM LOOK REASONABLY GOOD SO UPDATES... IF ANY...SHOULD BE FOR MINOR CHANGES ONLY. NO TSTMS VCNTY FLASH FLOOD WATCH IN NORTHWEST IOWA ATTM BUT POTENTIAL STILL THERE FOR HEAVY RAIN TOWARD MIDNIGHT AND AFTER. .FSD...NONE BLOOM
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 7:15 PM CDT | Severe Thunderstorm Warning | FSD | Beadle | 35 min |
| Jul 24, 7:51 PM CDT | Severe Thunderstorm Warning | FSD | Beadle | 24 min |
| Jul 24, 8:12 PM CDT | Tornado Warning | FSD | Moody | 33 min |
| Jul 24, 8:18 PM CDT | Severe Thunderstorm Warning | FSD | Beadle | 32 min |
| Jul 24, 9:36 PM CDT | Severe Thunderstorm Warning | FSD | Hanson | 34 min |
| Jul 24, 9:49 PM CDT | Tornado Warning | FSD | Kingsbury | 31 min |
| Jul 24, 10:33 PM CDT | Tornado Warning | FSD | Kingsbury | 32 min |
| Jul 24, 11:05 PM CDT | Tornado Warning | FSD | Kingsbury | 35 min |
| Jul 24, 11:41 PM CDT | Severe Thunderstorm Warning | FSD | Brookings | 49 min |
| Jul 25, 12:02 AM CDT | Tornado Warning | FSD | Kingsbury | 33 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 1997Every severe thunderstorm warning in 1997
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.