Alert archive / South Dakota / Severe Thunderstorm Watches in 1997
Severe Thunderstorm Watch 487
The Storm Prediction Center issued this severe thunderstorm watch at Jun 20, 1997, 5:00 AM CDT for 4 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 20, 1997, 5:00 AM CDT (10:00 UTC)
- Expired
- Jun 20, 1997, 10:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 55 counties
Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Sioux County, IA, Cottonwood County, MN, Jackson County, MN, Martin County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Watonwan County, MN, Boyd County, NE, Keya Paha County, NE, Aurora County, SD, Bennett County, SD, Bon Homme County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Haakon County, SD, Hanson County, SD, Hutchinson County, SD, Jackson County, SD, Jerauld County, SD, Jones County, SD, Lake County, SD, Lincoln County, SD, Lyman County, SD, McCook County, SD, Mellette County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Oglala Lakota County, SD, Pennington County, SD, Sanborn County, SD, Stanley County, SD, Todd County, SD, Tripp County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The North Platte radar (KLNX), 212 km from the middle of the area, began a volume at 09:59 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
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 5:00 AM CDT | Severe Thunderstorm Warning | FSD | Minnehaha | 30 min |
| Jun 20, 5:14 AM CDT | Severe Thunderstorm Warning | FSD | Turner | 31 min |
| Jun 20, 5:19 AM CDT | Severe Thunderstorm Warning | FSD | Douglas, Hutchinson | 36 min |
| Jun 20, 5:32 AM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Minnehaha | 33 min |
| Jun 20, 5:54 AM CDT | Severe Thunderstorm Warning | FSD | Lyon, Sioux | 31 min |
| Jun 20, 5:59 AM CDT | Severe Thunderstorm Warning | FSD | Hutchinson, Yankton | 31 min |
| Jun 20, 6:29 AM CDT | Severe Thunderstorm Warning | FSD | Sioux | 36 min |
| Jun 20, 6:38 AM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Union | 32 min |
| Jun 20, 8:28 AM CDT | Severe Thunderstorm Warning | FSD | O'Brien, Osceola | 32 min |
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 10.0 hours before the alert went out and 163 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
- 941 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 1569 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.7
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 |
|---|---|---|---|---|
| Jun 19, 9:30 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 21 more | 5 hr |
| Jun 20, 1:00 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Audubon, Boone, Carroll, Cass and 21 more | 5 hr |
| Jun 20, 4:15 AM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Audubon, Benton, Black Hawk, Boone, Bremer and 53 more | 6 hr |
| Jun 19, 10:00 PM CDT | Severe Thunderstorm Watch | SPC | Becker, Benton, Big Stone, Blue Earth, Brown, Carver and 35 more | 4 hr |
| Jun 20, 3:30 PM CDT | Tornado Watch | SPC | Arthur, Banner, Box Butte, Chase, Cherry, Cheyenne and 26 more | 7 hr |
| Jun 20, 12:00 AM CDT | Severe Thunderstorm Watch | SPC | Aurora, Beadle, Bennett, Bon Homme, Brookings, Brule and 31 more | 5 hr |
Nearby
Severe Thunderstorm Watches in South Dakota, 1997Severe Thunderstorm Watches in Iowa, 1997Severe Thunderstorm Watches in Minnesota, 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.