Alert archive / South Dakota / Tornado Watches in 2010
Tornado Watch 527
The Storm Prediction Center issued this tornado watch at Jul 23, 2010, 8:30 PM CDT for 4 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 23, 2010, 8:30 PM CDT (01:30 UTC)
- Expired
- Jul 24, 2010, 1:39 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 53 counties
Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Ida County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Brown County, MN, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Martin County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Redwood County, MN, Rock County, MN, Watonwan County, MN, Yellow Medicine County, MN, Antelope County, NE, Boyd County, NE, Cedar County, NE, Dakota County, NE, Dixon County, NE, Holt County, NE, Knox County, NE, Pierce County, NE, Wayne County, NE, Bon Homme County, SD, Brookings County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory 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), 21 km from the middle of the area, began a volume at 01:30 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
- 30%
- 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
- 70%
Warnings issued inside it
21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 8:39 PM CDT | Severe Thunderstorm Warning | FSD | Davison, Douglas, Hanson, Hutchinson, McCook | 36 min |
| Jul 23, 8:53 PM CDT | Severe Thunderstorm Warning | OAX | Knox | 52 min |
| Jul 23, 9:00 PM CDT | Severe Thunderstorm Warning | FSD | Kingsbury, Lake, Miner | 45 min |
| Jul 23, 9:13 PM CDT | Severe Thunderstorm Warning | FSD | Hanson, Hutchinson, McCook, Minnehaha, Turner | 47 min |
| Jul 23, 9:14 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Charles Mix | 46 min |
| Jul 23, 9:19 PM CDT | Severe Thunderstorm Warning | FSD | Brookings, Kingsbury, Lake, Moody | 41 min |
| Jul 23, 9:32 PM CDT | Severe Thunderstorm Warning | LBF | Boyd, Holt | 28 min |
| Jul 23, 9:40 PM CDT | Severe Thunderstorm Warning | FSD | Pipestone, Rock | 50 min |
| Jul 23, 9:43 PM CDT | Severe Thunderstorm Warning | OAX | Knox | 31 min |
| Jul 23, 9:44 PM CDT | Severe Thunderstorm Warning | FSD | Lyon | 46 min |
| Jul 23, 9:54 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Clay, Hutchinson, Lincoln, Turner, Yankton | 36 min |
| Jul 23, 9:58 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Pipestone | 47 min |
| Jul 23, 10:34 PM CDT | Severe Thunderstorm Warning | FSD | Jackson, Nobles, Rock | 41 min |
| Jul 23, 10:39 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Lyon, Murray, Nobles, Pipestone, Rock | 36 min |
| Jul 23, 10:46 PM CDT | Severe Thunderstorm Warning | MPX | Redwood | 44 min |
| Jul 23, 11:02 PM CDT | Severe Thunderstorm Warning | FSD | Cottonwood, Lyon, Murray | 43 min |
| Jul 23, 11:06 PM CDT | Severe Thunderstorm Warning | FSD | Jackson, Nobles | 39 min |
| Jul 23, 11:13 PM CDT | Severe Thunderstorm Warning | MPX | Brown, Martin, Redwood, Watonwan | 62 min |
| Jul 23, 11:38 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Clay, Dickinson, O'Brien, Osceola | 42 min |
| Jul 23, 11:41 PM CDT | Severe Thunderstorm Warning | FSD | Jackson | 34 min |
| Jul 23, 11:41 PM CDT | Flash Flood Warning | MPX | Brown, Nicollet, Redwood, Renville, Sibley | 99 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 00:00Z, 1.5 hours before the alert went out and 179 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
- 454 J/kg
- Mixed-layer CIN
- -44 J/kg
- Mixed-layer LCL
- 613 m above ground
- 0-6 km bulk shear
- 76 kt
- 0-1 km storm-relative helicity
- 236 m²/s²
- 0-3 km storm-relative helicity
- 543 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 5.6
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 7:50 PM CDT | Mesoscale Discussion | SPC | Clarke, Iowa, Jasper, Keokuk, Lucas, Mahaska and 7 more | 85 min |
| Jul 23, 10:49 PM CDT | Mesoscale Discussion | SPC | Bremer, Buena Vista, Butler, Calhoun, Cerro Gordo, Cherokee and 28 more | 86 min |
| Jul 23, 11:16 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 15 more | 5 hr |
| Jul 23, 11:31 PM CDT | Mesoscale Discussion | SPC | Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more | 2 hr |
| Jul 24, 1:53 PM CDT | Severe Thunderstorm Watch | SPC | Des Moines, Henry, Jefferson, Lee, Van Buren | 7 hr |
| Jul 24, 3:37 PM CDT | Mesoscale Discussion | SPC | Des Moines, Henry, Lee, Louisa, Muscatine, Scott and 1 more | 83 min |
Nearby
Tornado Watches in South Dakota, 2010Tornado Watches in Minnesota, 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.