Alert archive / Iowa / Tornado Watches in 2009
Tornado Watch 347
The Storm Prediction Center issued this tornado watch at Jun 7, 2009, 10:53 PM CDT for 4 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 7, 2009, 10:53 PM CDT (03:53 UTC)
- Expired
- Jun 8, 2009, 3:56 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 60 kt
All 55 counties
Adair County, IA, Adams County, IA, Cass County, IA, Clarke County, IA, Dallas County, IA, Decatur County, IA, Fremont County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Marion County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Wayne County, IA, Brown County, KS, Doniphan County, KS, Marshall County, KS, Nemaha County, KS, Washington County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Caldwell County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Livingston County, MO, Mercer County, MO, Nodaway County, MO, Worth County, MO, Cass County, NE, Douglas County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE
The radar
The Omaha radar (KOAX), 97 km from the middle of the area, began a volume at 03:56 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
- 60%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 60%
- One or more hailstones of 2 inches or more
- 50%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 7, 10:55 PM CDT | Tornado Warning | EAX | Daviess | 35 min |
| Jun 7, 11:05 PM CDT | Severe Thunderstorm Warning | EAX | Daviess | 30 min |
| Jun 7, 11:20 PM CDT | Severe Thunderstorm Warning | OAX | Gage, Jefferson, Lancaster, Saline | 40 min |
| Jun 7, 11:22 PM CDT | Flash Flood Warning | DMX | Adams, Taylor | 6 hr |
| Jun 7, 11:26 PM CDT | Severe Thunderstorm Warning | EAX | Grundy, Livingston | 34 min |
| Jun 7, 11:33 PM CDT | Severe Thunderstorm Warning | OAX | Cass, Sarpy, Saunders | 57 min |
| Jun 7, 11:48 PM CDT | Severe Thunderstorm Warning | OAX | Gage, Johnson, Lancaster, Otoe | 42 min |
| Jun 7, 11:56 PM CDT | Severe Thunderstorm Warning | DMX | Ringgold | 38 min |
| Jun 8, 12:02 AM CDT | Severe Thunderstorm Warning | DMX | Adair, Cass | 43 min |
| Jun 8, 12:22 AM CDT | Severe Thunderstorm Warning | OAX | Fremont | 25 min |
| Jun 8, 12:38 AM CDT | Severe Thunderstorm Warning | DMX | Decatur, Ringgold | 21 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 00:00Z, 3.9 hours before the alert went out and 98 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
- 1712 J/kg
- Mixed-layer CIN
- -173 J/kg
- Mixed-layer LCL
- 750 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 246 m²/s²
- 0-3 km storm-relative helicity
- 272 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.6
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 7, 8:49 PM CDT | Mesoscale Discussion | SPC | Appanoose, Benton, Buchanan, Cedar, Davis, Henry and 18 more | 56 min |
| Jun 7, 10:22 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Cass, Dallas, Fremont, Madison and 7 more | 53 min |
| Jun 7, 11:09 PM CDT | Severe Thunderstorm Watch | SPC | Des Moines, Henry, Jefferson, Lee, Louisa, Van Buren | 6 hr |
| Jun 8, 2:30 AM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Cass, Clarke, Dallas and 22 more | 60 min |
| Jun 8, 3:25 AM CDT | Mesoscale Discussion | SPC | Des Moines, Henry, Jefferson, Lee, Louisa, Van Buren | 65 min |
| Jun 7, 7:08 PM CDT | Mesoscale Discussion | SPC | Anderson, Barber, Butler, Chase, Coffey, Greenwood and 7 more | 67 min |
| Jun 7, 8:13 PM CDT | Mesoscale Discussion | SPC | Graham, Jewell, Mitchell, Norton, Osborne, Phillips and 3 more | 62 min |
| Jun 7, 11:31 PM CDT | Severe Thunderstorm Watch | SPC | Allen, Bourbon, Butler, Chase, Chautauqua, Cherokee and 14 more | 5 hr |
| Jun 8, 12:34 AM CDT | Severe Thunderstorm Watch | SPC | Jewell, Mitchell, Osborne, Phillips, Rooks, Smith | 1 min |
| Jun 8, 3:20 PM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Cape Girardeau, Carter, Christian, Crawford and 26 more | 85 min |
| Jun 8, 4:33 PM CDT | Severe Thunderstorm Watch | SPC | Bollinger, Butler, Cape Girardeau, Carter, Crawford, Dent and 20 more | 5 hr |
Nearby
Tornado Watches in Iowa, 2009Tornado Watches in Missouri, 2009Tornado Watches in Nebraska, 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.