Alert archive / Iowa / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 519
The Storm Prediction Center issued this severe thunderstorm watch at Jul 25, 2012, 5:16 PM CDT for 54 counties in Iowa; 17 counties in Minnesota; 11 counties in Wisconsin. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 25, 2012, 5:16 PM CDT (22:16 UTC)
- Expired
- Jul 26, 2012, 1:00 AM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 82 counties
Adair County, IA, Adams County, IA, Allamakee County, IA, Audubon County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Cherokee County, IA, Chickasaw County, IA, Clay County, IA, Clayton County, IA, Crawford County, IA, Dallas County, IA, Dickinson County, IA, Emmet County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Howard County, IA, Humboldt County, IA, Ida County, IA, Jasper County, IA, Kossuth County, IA, Madison County, IA, Marshall County, IA, Mitchell County, IA, O'Brien County, IA, Palo Alto County, IA, Pocahontas County, IA, Polk County, IA, Poweshiek County, IA, Sac County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Webster County, IA, Winnebago County, IA, Winneshiek County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Blue Earth County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Houston County, MN, Jackson County, MN, Martin County, MN, Mower County, MN, Olmsted County, MN, Rice County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Watonwan County, MN, Winona County, MN, Adams County, WI, Buffalo County, WI, Crawford County, WI, Grant County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Monroe County, WI, Richland County, WI, Trempealeau County, WI, Vernon County, WI
The radar
The Des Moines radar (KDMX), 135 km from the middle of the area, began a volume at 22:18 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
27 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 5:16 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 29 min |
| Jul 25, 5:25 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, O'Brien | 35 min |
| Jul 25, 5:31 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 59 min |
| Jul 25, 5:43 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 47 min |
| Jul 25, 6:03 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson | 42 min |
| Jul 25, 6:08 PM CDT | Severe Thunderstorm Warning | DMX | Emmet, Palo Alto | 52 min |
| Jul 25, 6:17 PM CDT | Severe Thunderstorm Warning | DMX | Emmet, Kossuth, Palo Alto | 43 min |
| Jul 25, 6:38 PM CDT | Severe Thunderstorm Warning | DMX | Palo Alto | 52 min |
| Jul 25, 6:58 PM CDT | Severe Thunderstorm Warning | DMX | Kossuth | 47 min |
| Jul 25, 7:09 PM CDT | Severe Thunderstorm Warning | DMX | Humboldt, Pocahontas | 51 min |
| Jul 25, 7:23 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Carroll, Greene, Sac | 37 min |
| Jul 25, 7:29 PM CDT | Severe Thunderstorm Warning | DMX | Hancock, Wright | 46 min |
| Jul 25, 8:02 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Calhoun, Greene, Hamilton, Webster | 43 min |
| Jul 25, 8:09 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Franklin, Hamilton, Hancock, Hardin, Wright | 51 min |
| Jul 25, 8:22 PM CDT | Severe Thunderstorm Warning | DMX | Marshall | 53 min |
| Jul 25, 8:38 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 22 min |
| Jul 25, 8:39 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Hamilton, Hardin, Story, Webster | 66 min |
| Jul 25, 9:03 PM CDT | Severe Thunderstorm Warning | ARX | Grant | 57 min |
| Jul 25, 9:04 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marion, Polk, Story, Warren | 41 min |
| Jul 25, 9:10 PM CDT | Severe Thunderstorm Warning | DMX | Grundy, Hardin, Marshall, Story, Tama | 50 min |
| Jul 25, 9:40 PM CDT | Severe Thunderstorm Warning | ARX | Chickasaw | 35 min |
| Jul 25, 9:52 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk | 33 min |
| Jul 25, 9:57 PM CDT | Severe Thunderstorm Warning | DMX | Poweshiek, Tama | 34 min |
| Jul 25, 10:03 PM CDT | Severe Thunderstorm Warning | ARX | Fayette, Winneshiek | 43 min |
| Jul 25, 10:25 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 65 min |
| Jul 25, 10:49 PM CDT | Severe Thunderstorm Warning | ARX | Grant | 56 min |
| Jul 25, 11:45 PM CDT | Severe Thunderstorm Warning | ARX | Richland | 30 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
Omaha, NE (KOAX), launched 12:00Z, 10.3 hours before the alert went out and 218 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
- 675 J/kg
- Mixed-layer CIN
- -402 J/kg
- Mixed-layer LCL
- 2150 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 198 m²/s²
- 0-3 km storm-relative helicity
- 222 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 4:28 PM CDT | Severe Thunderstorm Watch | SPC | Fremont, Harrison, Mills, Monona, Montgomery, Page and 2 more | 7 hr |
| Jul 24, 9:08 PM CDT | Severe Thunderstorm Watch | SPC | Becker, Cass, Clay, Crow Wing, Douglas, Grant and 8 more | 7 hr |
| Jul 24, 11:24 PM CDT | Mesoscale Discussion | SPC | Aitkin, Becker, Benton, Big Stone, Cass, Clay and 20 more | 96 min |
| Jul 25, 2:05 AM CDT | Mesoscale Discussion | SPC | Aitkin, Carlton, Cass, Crow Wing, Pine | 55 min |
| Jul 25, 2:24 AM CDT | Severe Thunderstorm Watch | SPC | Aitkin, Benton, Carlton, Cass, Chisago, Crow Wing and 13 more | 5 hr |
| Jul 25, 3:41 AM CDT | Mesoscale Discussion | SPC | Becker, Clay, Grant, Hubbard, Mahnomen, Otter Tail and 2 more | 34 min |
| Jul 25, 5:24 AM CDT | Mesoscale Discussion | SPC | Aitkin, Benton, Big Stone, Carlton, Cass, Chisago and 20 more | 66 min |
| Jul 25, 1:56 PM CDT | Mesoscale Discussion | SPC | Becker, Beltrami, Big Stone, Clay, Clearwater, Grant and 14 more | 2 hr |
| Jul 25, 2:52 PM CDT | Mesoscale Discussion | SPC | Adams, Antelope, Boone, Buffalo, Butler, Cedar and 42 more | 113 min |
| Jul 25, 2:57 PM CDT | Mesoscale Discussion | SPC | Brown, Calumet, Clark, Eau Claire, Fond du Lac, Jackson and 17 more | 2 hr |
| Jul 25, 6:25 PM CDT | Mesoscale Discussion | SPC | Brown, Calumet, Dodge, Fond du Lac, Green Lake, Kewaunee and 8 more | 95 min |
| Jul 25, 6:38 PM CDT | Severe Thunderstorm Watch | SPC | Brown, Calumet, Columbia, Dane, Dodge, Fond du Lac and 23 more | 7 hr |
Nearby
Severe Thunderstorm Watches in Iowa, 2012Severe Thunderstorm Watches in Minnesota, 2012Severe Thunderstorm Watches in Wisconsin, 2012Every severe thunderstorm watch in 2012
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.