Alert archive / Minnesota / Severe Thunderstorm Watches in 1997
Severe Thunderstorm Watch 734
The Storm Prediction Center issued this severe thunderstorm watch at Sep 18, 1997, 9:15 PM CDT for 5 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 18, 1997, 9:15 PM CDT (02:15 UTC)
- Expired
- Sep 19, 1997, 4:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
All 74 counties
Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dickinson County, IA, Emmet County, IA, Hancock County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Lyon County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Sac County, IA, Sioux County, IA, Webster County, IA, Winnebago County, IA, Woodbury County, IA, Worth County, IA, Blue Earth County, MN, Brown County, MN, Carver County, MN, Cottonwood County, MN, Dakota County, MN, Dodge County, MN, Faribault County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Jackson County, MN, Kandiyohi County, MN, Le Sueur County, MN, Martin County, MN, McLeod County, MN, Meeker County, MN, Mower County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Olmsted County, MN, Ramsey County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Rock County, MN, Scott County, MN, Sibley County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Washington County, MN, Watonwan County, MN, Wright County, MN, Antelope County, NE, Cedar County, NE, Dakota County, NE, Dixon County, NE, Pierce County, NE, Thurston County, NE, Wayne County, NE, Clay County, SD, Lincoln County, SD, Union County, SD, Chippewa County, WI, Dunn County, WI, Pepin County, WI, Pierce County, WI, Saint Croix County, WI
The radar
The Sioux Falls radar (KFSD), 111 km from the middle of the area, began a volume at 02:15 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 |
|---|---|---|---|---|
| Sep 18, 9:45 PM CDT | Severe Thunderstorm Warning | FSD | Dixon | 45 min |
| Sep 18, 9:49 PM CDT | Severe Thunderstorm Warning | OAX | Cedar | 46 min |
| Sep 18, 10:28 PM CDT | Severe Thunderstorm Warning | FSD | Dakota, Dixon | 47 min |
| Sep 18, 11:32 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 33 min |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 2.3 hours before the alert went out and 224 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
- 1943 J/kg
- Mixed-layer CIN
- -114 J/kg
- Mixed-layer LCL
- 867 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 298 m²/s²
- 0-3 km storm-relative helicity
- 399 m²/s²
- Significant tornado parameter
- 2.1
- Supercell composite
- 8.4
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 |
|---|---|---|---|---|
| Sep 19, 11:00 AM CDT | Severe Thunderstorm Watch | SPC | Buchanan, Cedar, Clayton, Clinton, Delaware, Des Moines and 11 more | 5 hr |
| Sep 19, 12:00 AM CDT | Severe Thunderstorm Watch | SPC | Dakota | 6 hr |
| Sep 18, 7:30 PM CDT | Severe Thunderstorm Watch | SPC | Florence, Forest, Langlade, Lincoln, Marinette, Oneida and 1 more | 7 hr |
Nearby
Severe Thunderstorm Watches in Minnesota, 1997Severe Thunderstorm Watches in Iowa, 1997Severe Thunderstorm Watches in Nebraska, 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.