Alert archive / South Dakota / Tornado Watches in 2006
Tornado Watch 746
The Storm Prediction Center issued this tornado watch at Aug 24, 2006, 5:51 PM CDT for 6 counties in Iowa; 8 counties in Minnesota; 17 counties in South Dakota. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 24, 2006, 5:51 PM CDT (22:51 UTC)
- Expired
- Aug 24, 2006, 10:12 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 70 kt
All 31 counties
Clay 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, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Aurora County, SD, Beadle County, SD, Brookings County, SD, Davison County, SD, Douglas County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld 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
The radar
The Sioux Falls radar (KFSD), 58 km from the middle of the area, began a volume at 22:54 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 SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 70%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 24, 6:27 PM CDT | Tornado Warning | FSD | Beadle | 63 min |
| Aug 24, 7:11 PM CDT | Tornado Warning | FSD | Beadle | 64 min |
| Aug 24, 7:23 PM CDT | Tornado Warning | FSD | Kingsbury | 52 min |
| Aug 24, 8:01 PM CDT | Tornado Warning | FSD | Miner | 36 min |
| Aug 24, 8:12 PM CDT | Tornado Warning | FSD | Kingsbury | 33 min |
| Aug 24, 8:27 PM CDT | Severe Thunderstorm Warning | FSD | Hanson, McCook | 37 min |
| Aug 24, 9:25 PM CDT | Severe Thunderstorm Warning | FSD | Minnehaha | 35 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
Aberdeen, SD (KABR), launched 12:00Z, 10.9 hours before the alert went out and 140 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
- 3787 J/kg
- Mixed-layer CIN
- -166 J/kg
- Mixed-layer LCL
- 769 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 130 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 24, 1:05 PM CDT | Mesoscale Discussion | SPC | Allamakee | 115 min |
| Aug 24, 3:17 PM CDT | Tornado Watch | SPC | Allamakee, Howard, Mitchell, Winneshiek | 9 hr |
| Aug 24, 5:36 PM CDT | Mesoscale Discussion | SPC | Lyon | 54 min |
| Aug 24, 6:03 PM CDT | Mesoscale Discussion | SPC | Allamakee, Howard, Mitchell, Winneshiek | 87 min |
| Aug 24, 8:44 AM CDT | Severe Thunderstorm Watch | SPC | Anoka, Benton, Blue Earth, Brown, Carver, Chippewa and 39 more | 7 hr |
| Aug 24, 10:18 AM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Blue Earth, Brown, Carver, Chippewa and 38 more | 87 min |
| Aug 24, 11:52 AM CDT | Severe Thunderstorm Watch | SPC | Big Stone, Clay, Grant, Otter Tail, Traverse, Wilkin | 5 hr |
| Aug 24, 2:44 PM CDT | Mesoscale Discussion | SPC | Blue Earth, Brown, Cottonwood, Dodge, Goodhue, Lac qui Parle and 16 more | 3 hr |
| Aug 24, 2:57 PM CDT | Mesoscale Discussion | SPC | Big Stone, Traverse, Wilkin | 2 hr |
| Aug 24, 3:40 PM CDT | Tornado Watch | SPC | Big Stone, Clay, Grant, Otter Tail, Traverse, Wilkin | 6 hr |
Nearby
Tornado Watches in South Dakota, 2006Tornado Watches in Minnesota, 2006Tornado Watches in Iowa, 2006Every tornado watch in 2006
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.