Alert archive / Iowa / Tornado Watches in 2010
Tornado Watch 391
The Storm Prediction Center issued this tornado watch at Jun 23, 2010, 1:29 AM CDT for 4 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 23, 2010, 1:29 AM CDT (06:29 UTC)
- Expired
- Jun 23, 2010, 7:59 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 24 counties
Allamakee County, IA, Benton County, IA, Buchanan County, IA, Clayton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Jackson County, IA, Jones County, IA, Linn County, IA, Winneshiek County, IA, Carroll County, IL, Jo Daviess County, IL, Stephenson County, IL, Houston County, MN, Crawford County, WI, Dane County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Lafayette County, WI, Richland County, WI, Sauk County, WI, Vernon County, WI
The radar
The La Crosse radar (KARX), 91 km from the middle of the area, began a volume at 06:32 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
- 30%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 5%
- 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 |
|---|---|---|---|---|
| Jun 23, 1:41 AM CDT | Flash Flood Warning | ARX | Chickasaw, Fayette, Howard, Winneshiek | 3 hr |
| Jun 23, 1:50 AM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Fayette, Howard, Winneshiek | 55 min |
| Jun 23, 2:13 AM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Winneshiek | 52 min |
| Jun 23, 2:19 AM CDT | Severe Thunderstorm Warning | ARX | Fayette | 26 min |
| Jun 23, 2:28 AM CDT | Severe Thunderstorm Warning | DVN | Buchanan, Delaware | 62 min |
| Jun 23, 2:44 AM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Clayton, Fayette, Winneshiek | 61 min |
| Jun 23, 3:26 AM CDT | Severe Thunderstorm Warning | ARX | Crawford, Richland, Vernon | 32 min |
| Jun 23, 3:42 AM CDT | Severe Thunderstorm Warning | DVN | Carroll, Jo Daviess | 63 min |
| Jun 23, 4:07 AM CDT | Severe Thunderstorm Warning | ARX | Grant | 24 min |
| Jun 23, 4:11 AM CDT | Severe Thunderstorm Warning | MKX | Lafayette | 37 min |
| Jun 23, 4:19 AM CDT | Severe Thunderstorm Warning | DVN | Carroll, Rock Island, Whiteside | 56 min |
| Jun 23, 4:36 AM CDT | Severe Thunderstorm Warning | MKX | Green | 22 min |
| Jun 23, 5:07 AM CDT | Severe Thunderstorm Warning | DVN | Carroll, Henry, Jo Daviess, Rock Island, Stephenson, Whiteside | 43 min |
| Jun 23, 5:44 AM CDT | Flash Flood Warning | ARX | Richland | 4 hr |
| Jun 23, 5:56 AM CDT | Flash Flood Warning | DVN | Carroll | 8 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 6.5 hours before the alert went out and 165 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
- 3187 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 655 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 99 m²/s²
- 0-3 km storm-relative helicity
- 227 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 6.9
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 22, 11:47 PM CDT | Mesoscale Discussion | SPC | Jo Daviess | 88 min |
| Jun 23, 3:38 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Cook, DeKalb, DuPage, Grundy and 14 more | 6 hr |
| Jun 23, 8:31 AM CDT | Mesoscale Discussion | SPC | Grundy, Kankakee, LaSalle, Livingston, Marshall, Putnam and 3 more | 59 min |
| Jun 23, 1:01 PM CDT | Mesoscale Discussion | SPC | Bureau, Carroll, Cook, DeKalb, DuPage, Ford and 23 more | 59 min |
| Jun 23, 2:10 PM CDT | Tornado Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 33 more | 7 hr |
| Jun 23, 2:44 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Calhoun, Greene, Jersey, Pike | 7 hr |
| Jun 23, 5:56 PM CDT | Mesoscale Discussion | SPC | Bureau, Cook, DeKalb, DuPage, Ford, Fulton and 23 more | 94 min |
| Jun 23, 6:29 PM CDT | Mesoscale Discussion | SPC | Adams, Hancock | 2 hr |
| Jun 23, 6:50 PM CDT | Severe Thunderstorm Watch | SPC | Cass, Champaign, Christian, Coles, DeWitt, Douglas and 12 more | 5 hr |
| Jun 22, 7:08 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Benton, Black Hawk, Boone and 66 more | 2 hr |
| Jun 22, 7:56 PM CDT | Severe Thunderstorm Watch | SPC | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more | 8 hr |
| Jun 22, 9:00 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 49 more | 9 hr |
| Jun 22, 9:59 PM CDT | Mesoscale Discussion | SPC | Buena Vista, Calhoun, Carroll, Cherokee, Clay, Crawford and 20 more | 91 min |
| Jun 22, 10:49 PM CDT | Tornado Watch | SPC | Butler, Calhoun, Cerro Gordo, Franklin, Grundy, Hamilton and 8 more | 7 hr |
| Jun 23, 12:01 AM CDT | Severe Thunderstorm Watch | SPC | Fremont, Harrison, Mills, Monona, Montgomery, Page and 2 more | 3 hr |
| Jun 23, 12:40 AM CDT | Mesoscale Discussion | SPC | Butler, Cerro Gordo, Chickasaw, Clay, Dickinson, Emmet and 15 more | 95 min |
| Jun 23, 2:36 AM CDT | Severe Thunderstorm Watch | SPC | Howard, Mitchell | 5 hr |
| Jun 23, 5:46 AM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 28 more | 59 min |
| Jun 23, 2:48 PM CDT | Mesoscale Discussion | SPC | Allamakee, Winneshiek | 87 min |
| Jun 23, 1:49 AM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Chisago, Hennepin, Isanti, Kanabec and 7 more | 86 min |
| Jun 22, 8:58 PM CDT | Mesoscale Discussion | SPC | Ashland, Douglas, Florence, Forest, Iron, Oneida and 3 more | 92 min |
| Jun 23, 2:47 AM CDT | Mesoscale Discussion | SPC | Adams, Calumet, Columbia, Crawford, Dane, Dodge and 23 more | 88 min |
Nearby
Tornado Watches in Iowa, 2010Tornado Watches in Wisconsin, 2010Tornado Watches in Illinois, 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.