Alert archive / Minnesota / Tornado Watches in 2009
Tornado Watch 449
The Storm Prediction Center issued this tornado watch at Jun 17, 2009, 7:01 PM CDT for 18 counties in Iowa; 19 counties in Minnesota. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 17, 2009, 7:01 PM CDT (00:01 UTC)
- Expired
- Jun 17, 2009, 11:59 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 37 counties
Allamakee County, IA, Bremer County, IA, Butler County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Hancock County, IA, Howard County, IA, Humboldt County, IA, Kossuth County, IA, Mitchell County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Wright County, IA, Blue Earth County, MN, Brown County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Houston County, MN, Le Sueur County, MN, Martin County, MN, Mower County, MN, Nicollet County, MN, Olmsted County, MN, Rice County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Watonwan County, MN, Winona County, MN
The radar
The Minneapolis radar (KMPX), 127 km from the middle of the area, began a volume at 00:00 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
- 70%
- One or more EF2 to EF5 tornadoes
- 50%
- Ten or more severe wind reports
- 40%
- 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
- 50%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
24 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 17, 7:12 PM CDT | Tornado Warning | MPX | Blue Earth, Faribault, Martin, Waseca, Watonwan | 33 min |
| Jun 17, 7:14 PM CDT | Severe Thunderstorm Warning | ARX | Dodge, Mower | 46 min |
| Jun 17, 7:14 PM CDT | Tornado Warning | MPX | Le Sueur, Rice | 31 min |
| Jun 17, 7:16 PM CDT | Tornado Warning | MPX | Freeborn, Steele | 44 min |
| Jun 17, 7:25 PM CDT | Severe Thunderstorm Warning | ARX | Howard, Mitchell | 65 min |
| Jun 17, 7:28 PM CDT | Tornado Warning | ARX | Floyd | 47 min |
| Jun 17, 7:35 PM CDT | Tornado Warning | ARX | Dodge, Mower | 55 min |
| Jun 17, 7:49 PM CDT | Severe Thunderstorm Warning | MPX | Le Sueur, Rice, Steele, Waseca | 56 min |
| Jun 17, 8:04 PM CDT | Tornado Warning | MPX | Rice, Steele, Waseca | 26 min |
| Jun 17, 8:10 PM CDT | Tornado Warning | ARX | Chickasaw, Floyd | 50 min |
| Jun 17, 8:11 PM CDT | Tornado Warning | ARX | Mower | 64 min |
| Jun 17, 8:24 PM CDT | Tornado Warning | MPX | Steele | 33 min |
| Jun 17, 8:29 PM CDT | Severe Thunderstorm Warning | ARX | Howard, Winneshiek | 46 min |
| Jun 17, 8:31 PM CDT | Tornado Warning | ARX | Dodge | 59 min |
| Jun 17, 8:52 PM CDT | Tornado Warning | ARX | Howard, Mitchell | 53 min |
| Jun 17, 8:59 PM CDT | Tornado Warning | ARX | Chickasaw | 46 min |
| Jun 17, 9:14 PM CDT | Severe Thunderstorm Warning | ARX | Mower, Olmsted | 39 min |
| Jun 17, 9:29 PM CDT | Flash Flood Warning | ARX | Chickasaw | 3 hr |
| Jun 17, 9:47 PM CDT | Severe Thunderstorm Warning | ARX | Howard | 45 min |
| Jun 17, 9:50 PM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Fayette | 25 min |
| Jun 17, 10:48 PM CDT | Severe Thunderstorm Warning | MPX | Dakota, Goodhue, Washington | 42 min |
| Jun 17, 10:49 PM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Howard, Winneshiek | 56 min |
| Jun 17, 11:20 PM CDT | Severe Thunderstorm Warning | MPX | Goodhue | 40 min |
| Jun 17, 11:31 PM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Fayette, Winneshiek | 57 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 00:00Z, 0.0 hours before the alert went out and 127 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
- 1471 J/kg
- Mixed-layer CIN
- -35 J/kg
- Mixed-layer LCL
- 751 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 219 m²/s²
- 0-3 km storm-relative helicity
- 350 m²/s²
- Significant tornado parameter
- 1.8
- Supercell composite
- 12.7
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 17, 8:04 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Cass, Fremont, Guthrie and 8 more | 56 min |
| Jun 17, 9:04 PM CDT | Tornado Watch | SPC | Fremont, Mills, Montgomery, Page, Pottawattamie | 3 hr |
| Jun 17, 11:07 PM CDT | Mesoscale Discussion | SPC | Allamakee, Chickasaw, Clayton, Fayette, Howard, Winneshiek | 53 min |
| Jun 17, 11:33 PM CDT | Mesoscale Discussion | SPC | Fremont, Mills, Pottawattamie | 87 min |
| Jun 17, 11:53 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Allamakee, Appanoose, Audubon, Benton, Black Hawk and 68 more | 6 hr |
| Jun 18, 1:01 AM CDT | Mesoscale Discussion | SPC | Appanoose, Davis, Decatur, Des Moines, Henry, Jefferson and 6 more | 89 min |
| Jun 18, 3:20 AM CDT | Mesoscale Discussion | SPC | Davis, Des Moines, Henry, Iowa, Jefferson, Johnson and 12 more | 85 min |
| Jun 18, 4:20 AM CDT | Severe Thunderstorm Watch | SPC | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more | 4 hr |
| Jun 18, 6:41 AM CDT | Mesoscale Discussion | SPC | Black Hawk, Boone, Bremer, Buchanan, Buena Vista, Butler and 31 more | 94 min |
| Jun 18, 7:04 AM CDT | Severe Thunderstorm Watch | SPC | Black Hawk, Bremer, Butler, Calhoun, Cerro Gordo, Chickasaw and 20 more | 4 hr |
| Jun 18, 9:42 AM CDT | Mesoscale Discussion | SPC | Benton, Buchanan, Cedar, Clinton, Delaware, Dubuque and 8 more | 93 min |
| Jun 18, 10:11 AM CDT | Severe Thunderstorm Watch | SPC | Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 11 more | 6 hr |
| Jun 18, 1:17 PM CDT | Mesoscale Discussion | SPC | Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 11 more | 88 min |
| Jun 18, 3:15 PM CDT | Mesoscale Discussion | SPC | Black Hawk, Boone, Bremer, Buena Vista, Butler, Calhoun and 25 more | 90 min |
| Jun 18, 6:52 PM CDT | Mesoscale Discussion | SPC | Lyon, Sioux | 113 min |
| Jun 18, 12:52 PM CDT | Mesoscale Discussion | SPC | Becker, Clay, Douglas, Grant, Otter Tail, Pope and 5 more | 83 min |
| Jun 18, 1:50 PM CDT | Severe Thunderstorm Watch | SPC | Becker, Big Stone, Cass, Chippewa, Clay, Crow Wing and 17 more | 7 hr |
| Jun 18, 3:12 PM CDT | Tornado Watch | SPC | Anoka, Benton, Blue Earth, Brown, Carver, Chippewa and 36 more | 8 hr |
| Jun 18, 6:49 PM CDT | Mesoscale Discussion | SPC | Becker, Big Stone, Cass, Crow Wing, Douglas, Grant and 9 more | 86 min |
Nearby
Tornado Watches in Minnesota, 2009Tornado Watches in Iowa, 2009Every tornado watch in 2009
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.