Alert archive / Iowa / Tornado Watches in 2007
Tornado Watch 524
The Storm Prediction Center issued this tornado watch at Jul 16, 2007, 2:07 PM CDT for 34 counties in Iowa; 29 counties in Minnesota; 14 counties in South Dakota. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 16, 2007, 2:07 PM CDT (19:07 UTC)
- Expired
- Jul 16, 2007, 9:42 PM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 70 kt
All 77 counties
Black Hawk County, IA, Bremer County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Cerro Gordo County, IA, Cherokee County, IA, Chickasaw County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Howard County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Lyon County, IA, Mitchell County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Sac County, IA, Sioux County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA, Blue Earth County, MN, Brown County, MN, Chippewa County, MN, Cottonwood County, MN, Dodge County, MN, Faribault County, MN, Freeborn County, MN, Jackson County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Le Sueur County, MN, Lincoln County, MN, Lyon County, MN, Martin County, MN, McLeod County, MN, Mower 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, Brookings County, SD, Clark County, SD, Codington County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Spink County, SD
The radar
The Sioux Falls radar (KFSD), 82 km from the middle of the area, began a volume at 19:07 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
- 95%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 95%
- One or more hailstones of 2 inches or more
- 50%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
26 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 16, 2:28 PM CDT | Severe Thunderstorm Warning | MPX | Yellow Medicine | 37 min |
| Jul 16, 2:39 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln | 36 min |
| Jul 16, 3:32 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln | 43 min |
| Jul 16, 4:12 PM CDT | Severe Thunderstorm Warning | FSD | Cottonwood | 33 min |
| Jul 16, 4:29 PM CDT | Severe Thunderstorm Warning | FSD | Pipestone | 31 min |
| Jul 16, 5:04 PM CDT | Severe Thunderstorm Warning | ARX | Howard | 26 min |
| Jul 16, 5:06 PM CDT | Severe Thunderstorm Warning | FSD | Jackson | 24 min |
| Jul 16, 5:09 PM CDT | Severe Thunderstorm Warning | MPX | Martin | 51 min |
| Jul 16, 5:13 PM CDT | Severe Thunderstorm Warning | ARX | Floyd | 32 min |
| Jul 16, 5:13 PM CDT | Severe Thunderstorm Warning | DMX | Emmet | 47 min |
| Jul 16, 5:31 PM CDT | Severe Thunderstorm Warning | ARX | Chickasaw | 59 min |
| Jul 16, 5:40 PM CDT | Severe Thunderstorm Warning | DMX | Bremer, Butler | 65 min |
| Jul 16, 5:43 PM CDT | Severe Thunderstorm Warning | DMX | Emmet, Kossuth | 47 min |
| Jul 16, 6:08 PM CDT | Severe Thunderstorm Warning | DMX | Hancock, Kossuth | 52 min |
| Jul 16, 6:38 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Butler | 37 min |
| Jul 16, 7:04 PM CDT | Severe Thunderstorm Warning | ARX | Howard | 26 min |
| Jul 16, 7:04 PM CDT | Severe Thunderstorm Warning | MPX | Freeborn | 23 min |
| Jul 16, 7:10 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk | 65 min |
| Jul 16, 7:14 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo | 16 min |
| Jul 16, 7:23 PM CDT | Severe Thunderstorm Warning | ARX | Mower | 37 min |
| Jul 16, 7:35 PM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Howard, Winneshiek | 25 min |
| Jul 16, 7:40 PM CDT | Severe Thunderstorm Warning | DMX | Butler, Franklin | 50 min |
| Jul 16, 7:48 PM CDT | Tornado Warning | ARX | Chickasaw | 17 min |
| Jul 16, 8:02 PM CDT | Severe Thunderstorm Warning | DMX | Grundy | 43 min |
| Jul 16, 8:22 PM CDT | Severe Thunderstorm Warning | DMX | Bremer | 38 min |
| Jul 16, 8:29 PM CDT | Tornado Warning | DMX | Black Hawk, Grundy, Tama | 31 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, 7.1 hours before the alert went out and 205 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
- 2 J/kg
- Mixed-layer CIN
- -184 J/kg
- Mixed-layer LCL
- 1130 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 169 m²/s²
- 0-3 km storm-relative helicity
- 231 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 |
|---|---|---|---|---|
| Jul 15, 9:37 PM CDT | Mesoscale Discussion | SPC | Harrison, Mills, Montgomery, Pottawattamie | 83 min |
| Jul 16, 1:36 PM CDT | Mesoscale Discussion | SPC | Buena Vista, Cerro Gordo, Clay, Dickinson, Emmet, Franklin and 13 more | 114 min |
| Jul 16, 3:11 PM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Bremer, Buchanan, Clayton, Delaware and 12 more | 2 hr |
| Jul 16, 3:38 PM CDT | Tornado Watch | SPC | Appanoose, Benton, Boone, Buchanan, Cedar, Clarke and 39 more | 7 hr |
| Jul 16, 5:24 PM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Boone, Bremer, Buchanan, Butler and 47 more | 2 hr |
| Jul 15, 7:42 PM CDT | Mesoscale Discussion | SPC | Becker, Big Stone, Chippewa, Clay, Douglas, Grant and 16 more | 93 min |
| Jul 15, 10:20 PM CDT | Mesoscale Discussion | SPC | Big Stone, Chippewa, Douglas, Grant, Kandiyohi, Lac qui Parle and 9 more | 55 min |
Nearby
Tornado Watches in Iowa, 2007Tornado Watches in Minnesota, 2007Tornado Watches in South Dakota, 2007Every tornado watch in 2007
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.