Alert archive / South Dakota / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 87, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 24, 1997, 9:36 PM CDT for Hanson County, South Dakota. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 24, 1997, 9:36 PM CDT (02:36 UTC)
- Expired
- Jul 24, 1997, 10:10 PM CDT
- In force
- 34 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Hanson County, SD
The radar
The Sioux Falls radar (KFSD), 86 km from the middle of the area, began a volume at 02:39 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 nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 2.6 hours before the alert went out and 145 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 250237 RRA SVRFSD SDC061-250310- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 936 PM CDT THU JUL 24 1997 * SEVERE THUNDERSTORM WARNING FOR HANSON COUNTY IN SOUTHEASTERN SOUTH DAKOTA * UNTIL 1010 PM CDT * THIS STORM IS EXPECTED TO REMAIN IN RURAL AREAS. * AT 930 PM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED DAMAGING WINDS AND LARGE HAIL NEAR MITCHELL MOVING NORTHEAST AT 15 MPH. SOM<E OF THESE STORMS MAY CONTAIN SMALL HAIL...GUSTY WINDS...DEADLY LIGHTNING AND VERY HEAVY DOWNPOURS OF RAIN. & 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, 1 hour 4 minutes earlier.
Area forecast discussion, Jul 24, 8:32 PM CDT, 1 hour 4 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, 9:08 PM CDT | Severe Thunderstorm Warning | FSD | Beadle, Kingsbury | 47 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.