Alert archive / South Dakota / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 91, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 25, 1997, 9:54 PM CDT for Kingsbury County, South Dakota. It was in force for 46 min. 2 reports 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 25, 1997, 9:54 PM CDT (02:54 UTC)
- Expired
- Jul 25, 1997, 10:40 PM CDT
- In force
- 46 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Kingsbury County, SD
The radar
The Sioux Falls radar (KFSD), 106 km from the middle of the area, began a volume at 02:54 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 25, 10:10 PM CDT | Thunderstorm Wind 52 | Lake Preston, SD | Thunderstorm winds blew down power lines and caused tree damage. |
| Jul 25, 10:10 PM CDT | Thunderstorm Wind 61 | Arlington, SD | Thunderstorm winds caused widespread tree, power line, and pole damage. The winds also damaged a car wash under construction, blew down road signs, and broke windows. Some vehicles were damaged, mainly by trees or tree debris. |
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 |
|---|---|---|---|
| Jul 25, 6:00 PM CDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 2.9 hours before the alert went out and 93 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
- 3331 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 1007 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 68 m²/s²
- Significant tornado parameter
- 1.2
- Supercell composite
- 4.3
The text
As transmitted, in the capitals the NWS used until 2016.
503 WUUS1 KFSD 260305 RRA SVRFSD SDC077-260340- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING...CORRECTED NATIONAL WEATHER SERVICE SIOUX FALLS SD 954 PM CDT FRI JUL 25 1997 * SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN KINGSBURY COUNTY IN EASTCENTRAL SOUTH DAKOTA * UNTIL 1040 PM CDT * SOME AREAS AFFECTED BANCROFT AROUND 955 PM CDT MANCHESTER AROUND 1000 PM CDT DE SMET AROUND 1020 PM CDT * AT 952 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 18 MILES NORTHEAST OF HURON OR 6 MILES WEST OF BANCROFT MOVING EAST AT 30 MPH. A TORNADO WATCH IS ALSO IN EFFECT. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH... DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. BLOOM
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 25, 8:34 PM CDT, 1 hour 20 minutes earlier.
Area forecast discussion, Jul 25, 8:34 PM CDT, 1 hour 20 minutes before
SOUTH DAKOTA/NORTHWEST IOWA/SOUTHWEST MINNESOTA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SIOUX FALLS SD 834 PM CDT FRI JUL 25 1997 NEXRAD AT FSD SHOWS TSTMS OVR NERN SD MOVG SE TWD FORECAST AREA. THESE TSTMS SHOULD REACH COUNTIES IN WATCH AND FORECAST AREA THIS EVE. NEXRAD AT ABR ALSO SUPPPORTS THIS. TSTMS HAVE BEEN DVLPG ON PREVIOUS TSTM S BOUND OUTFLOW BOUNDRIES. NEXRAD AT FSD ALSO SHOWS TSTMS LONG RANGE OVR N CNTRL NE HAVE WEAKENED. TSTMS OVR CNTRL NE MOVG SLOWLY NORTHEAST BUT PAST HOUR HAVE ALSO SHOWN SIGNS OF WEAKENING. THESE APPEAR TO BE SEVERAL HOURS FROM FORECAST AREA ATTM BUT MAY REACH FORECAST AREA AFTER MIDN. MAY ISSUE UPDATE ON FORECAST FOR STRONGER WORDING ON TSTMS OVR NERN PART OF FORECAST AREA. .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 25, 10:13 PM CDT | Severe Thunderstorm Warning | FSD | Kingsbury | 47 min |
| Jul 25, 10:45 PM CDT | Severe Thunderstorm Warning | FSD | Brookings | 50 min |
| Jul 25, 11:03 PM CDT | Severe Thunderstorm Warning | FSD | Kingsbury, Lake | 47 min |
| Jul 25, 11:32 PM CDT | Tornado Warning | FSD | Lake | 48 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.