Alert archive / Minnesota / Tornado Watches in 2010
Tornado Watch 664
The Storm Prediction Center issued this tornado watch at Sep 15, 2010, 2:19 PM CDT for 20 counties in Iowa; 26 counties in Minnesota; 22 counties in South Dakota. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 15, 2010, 2:19 PM CDT (19:19 UTC)
- Expired
- Sep 15, 2010, 8:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 68 counties
Buena Vista County, IA, Cerro Gordo County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Hancock County, IA, Humboldt County, IA, Ida County, IA, Kossuth 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, Winnebago County, IA, Woodbury County, IA, Worth County, IA, Blue Earth County, MN, Brown County, MN, Chippewa County, MN, Cottonwood County, MN, Faribault County, MN, Freeborn County, MN, Jackson County, MN, Lac qui Parle County, MN, Le Sueur County, MN, Lincoln County, MN, Lyon County, MN, Martin County, MN, McLeod County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Pipestone County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Rock County, MN, Sibley County, MN, Steele County, MN, Waseca County, MN, Watonwan County, MN, Yellow Medicine County, MN, Beadle County, SD, Bon Homme County, SD, Brookings County, SD, Clark County, SD, Clay County, SD, Codington County, SD, Davison County, SD, Deuel County, SD, Hamlin County, SD, Hanson County, SD, Hutchinson County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 71 km from the middle of the area, began a volume at 19:20 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 SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 50%
- One or more EF2 to EF5 tornadoes
- 30%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 15, 3:06 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Yankton | 24 min |
| Sep 15, 3:28 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Yankton | 32 min |
| Sep 15, 3:38 PM CDT | Severe Thunderstorm Warning | FSD | Lake, Miner | 37 min |
| Sep 15, 4:00 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Yankton | 45 min |
| Sep 15, 5:17 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 28 min |
| Sep 15, 5:20 PM CDT | Flash Flood Warning | ABR | Codington, Deuel, Hamlin | 6 hr |
| Sep 15, 5:21 PM CDT | Severe Thunderstorm Warning | MPX | Blue Earth, Waseca | 39 min |
| Sep 15, 5:27 PM CDT | Severe Thunderstorm Warning | MPX | Blue Earth, Le Sueur, Nicollet | 48 min |
| Sep 15, 5:38 PM CDT | Severe Thunderstorm Warning | DMX | Kossuth | 27 min |
| Sep 15, 5:39 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Plymouth, Woodbury | 51 min |
| Sep 15, 5:43 PM CDT | Severe Thunderstorm Warning | MPX | Blue Earth, Le Sueur, Rice, Waseca | 32 min |
| Sep 15, 5:49 PM CDT | Severe Thunderstorm Warning | MPX | Steele, Waseca | 41 min |
| Sep 15, 6:13 PM CDT | Tornado Warning | MPX | Le Sueur | 32 min |
| Sep 15, 6:21 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Ida | 54 min |
| Sep 15, 7:01 PM CDT | Severe Thunderstorm Warning | FSD | Ida, Woodbury | 44 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 7.3 hours before the alert went out and 221 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 732 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 210 m²/s²
- 0-3 km storm-relative helicity
- 302 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 15, 1:50 PM CDT | Mesoscale Discussion | SPC | Clay, Dickinson, Emmet, Lyon, O'Brien, Osceola and 2 more | 55 min |
| Sep 15, 3:42 PM CDT | Mesoscale Discussion | SPC | Audubon, Carroll, Cherokee, Crawford, Guthrie, Harrison and 8 more | 93 min |
| Sep 15, 6:07 PM CDT | Mesoscale Discussion | SPC | Allamakee, Bremer, Buena Vista, Butler, Cerro Gordo, Cherokee and 26 more | 53 min |
| Sep 14, 8:02 PM CDT | Mesoscale Discussion | SPC | Bennett, Brule, Gregory, Lyman, Mellette, Todd and 1 more | 88 min |
| Sep 14, 9:54 PM CDT | Severe Thunderstorm Watch | SPC | Aurora, Beadle, Bennett, Brown, Brule, Buffalo and 36 more | 7 hr |
| Sep 14, 11:25 PM CDT | Mesoscale Discussion | SPC | Aurora, Beadle, Brown, Brule, Buffalo, Clark and 19 more | 65 min |
| Sep 15, 4:00 AM CDT | Mesoscale Discussion | SPC | Beadle, Brown, Buffalo, Clark, Dewey, Edmunds and 13 more | 60 min |
Nearby
Tornado Watches in Minnesota, 2010Tornado Watches in South Dakota, 2010Tornado Watches in Iowa, 2010Every tornado watch in 2010
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.