Alert archive / South Dakota / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 112, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 2, 1997, 8:37 PM CDT for Sanborn County, South Dakota. It was in force for 33 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
- Aug 2, 1997, 8:37 PM CDT (01:37 UTC)
- Expired
- Aug 2, 1997, 9:10 PM CDT
- In force
- 33 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Sanborn County, SD
The radar
The Sioux Falls radar (KFSD), 120 km from the middle of the area, began a volume at 01:40 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 |
|---|---|---|---|
| Aug 2, 4:00 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 1.6 hours before the alert went out and 101 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
- 290 J/kg
- Mixed-layer CIN
- -177 J/kg
- Mixed-layer LCL
- 1669 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 198 m²/s²
- 0-3 km storm-relative helicity
- 292 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFSD 030138 RRA SVRFSD SDC111-030210- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 837 PM CDT SAT AUG 2 1997 * SEVERE THUNDERSTORM WARNING FOR NORTHERN SANBORN COUNTY IN EASTCENTRAL SOUTH DAKOTA * UNTIL 910 PM CDT * THIS STORM IS EXPECTED TO REMAIN IN RURAL AREAS. * AT 836 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 7 MILES SOUTHEAST OF HURON MOVING SOUTHEAST AT 30 MPH. WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A STRONG BUILDING. DO NOT STAND BY WINDOWS. DO NOT USE TELEPHONES OR ELECTRICAL APPLIANCES UNTIL THE STORM HAS PASSED UNLESS IN AN EMERGENCY. MOTORISTS SHOULD NOT DR`IVE INTO LOW WATER CROSSINGS. 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 Aug 1, 8:56 PM CDT, 23 hours 41 minutes earlier.
Area forecast discussion, Aug 1, 8:56 PM CDT, 23 hours 41 minutes before
SOUTH DAKOTA/NORTHWEST IOWA/SOUTHWEST MINNESOTA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SIOUX FALLS SD 855 PM CDT FRI AUG 1 1997 SHORT WAVE TROUGH WELL EVIDENT IN WV IMAGERY AND IN EVNG RAOBS ACRS WRN ND...LTL STGR THAN MRNG MDLS INDICATE. ANY TSRA THAT WOULD SURVIVE NIGHTFALL SHOULD NOT AFFECT CWA. MAIN ISSUE TNGT BECOMES TMPS AND FOG POTENTIAL. AT SFC...WK CONVERGENCE BOUNDARY HELPING TO POOL LOW LVL MSTR ACRS FSD CWA. FLUSH OF LLM THRU MN IS MUCH WKR THAN 21Z RUC WOULD INDICATE...AND SUBSIDENCE FAVORING PROFILE STARTING TO WKN IN WDL PROFILER. FLOW ALREADY RETURNING TOWARD SRLY W. PATHETIC SFC GRADIENT MEANS ONLY SIG DRYING TNGT WOULD HAVE TO ORIGINATE FM ALOFT...AND MOST SHALLOW MOIST LYR OVR BIS-MPX. THIS MAY BE WKLY INDICATED BY MML DEWPOINT TREND. THUS COOLEST TMPS IN AREA SHOULD BE BTTR MIXED FAR W AND ALSO BKX-MML. ANY DEVIATION FM CRNT FCST SHUD BE A HALF CAT OR LESS...HIER SE AND LWR NE...SO WL HANDLE IN SHORT JTERM FCST. WL ALSO PUT IN MNTN OF FOG...ESPLY MO RVR AREAS AND NW IA IN AREAS OF ERLY MRNG RAINS. .FSD...NONE CHAPMAN
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 2, 8:11 PM CDT | Severe Thunderstorm Warning | FSD | Beadle | 49 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.