Alert archive / South Dakota / Severe Thunderstorm Watches in 1997
Severe Thunderstorm Watch 656
The Storm Prediction Center issued this severe thunderstorm watch at Jul 25, 1997, 11:00 PM CDT for 6 counties in Iowa; 7 counties in Minnesota; 11 counties in South Dakota. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 25, 1997, 11:00 PM CDT (04:00 UTC)
- Expired
- Jul 26, 1997, 3:00 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
All 24 counties
Cherokee County, IA, Dickinson County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Sioux County, IA, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Brookings County, SD, Hamlin County, SD, Hanson County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Turner County, SD
The radar
The Sioux Falls radar (KFSD), 45 km from the middle of the area, began a volume at 04:04 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.
Warnings issued inside it
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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 |
| Jul 25, 11:42 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Pipestone | 33 min |
| Jul 26, 12:14 AM CDT | Severe Thunderstorm Warning | FSD | Murray | 46 min |
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 4.0 hours before the alert went out and 181 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
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 7:45 PM CDT | Tornado Watch | SPC | Jackson | 5 hr |
| Jul 26, 11:00 AM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 12 more | 6 hr |
Nearby
Severe Thunderstorm Watches in South Dakota, 1997Severe Thunderstorm Watches in Minnesota, 1997Severe Thunderstorm Watches in Iowa, 1997Every severe thunderstorm watch 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.