Alert archive / Tennessee / Tornado Watches in 2009
Tornado Watch 383
The Storm Prediction Center issued this tornado watch at Jun 11, 2009, 9:18 PM EDT for 7 counties in Kentucky; 53 counties in Tennessee. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 11, 2009, 9:18 PM EDT (01:18 UTC)
- Expired
- Jun 12, 2009, 1:00 AM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 60 counties
Bell County, KY, Knox County, KY, Laurel County, KY, McCreary County, KY, Pulaski County, KY, Wayne County, KY, Whitley County, KY, Anderson County, TN, Bedford County, TN, Benton County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Cannon County, TN, Cheatham County, TN, Clay County, TN, Coffee County, TN, Cumberland County, TN, Davidson County, TN, DeKalb County, TN, Dickson County, TN, Fentress County, TN, Grundy County, TN, Hamilton County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Jackson County, TN, Knox County, TN, Loudon County, TN, Macon County, TN, Marshall County, TN, Maury County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Montgomery County, TN, Morgan County, TN, Overton County, TN, Pickett County, TN, Polk County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Robertson County, TN, Rutherford County, TN, Scott County, TN, Sequatchie County, TN, Sevier County, TN, Smith County, TN, Stewart County, TN, Sumner County, TN, Trousdale County, TN, Union County, TN, Van Buren County, TN, Warren County, TN, White County, TN, Williamson County, TN, Wilson County, TN
The radar
The Nashville radar (KOHX), 39 km from the middle of the area, began a volume at 01:21 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
- 50%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 9:36 PM EDT | Severe Thunderstorm Warning | OHX | Clay, Pickett | 24 min |
| Jun 11, 9:49 PM EDT | Severe Thunderstorm Warning | OHX | Montgomery, Robertson | 41 min |
| Jun 11, 9:52 PM EDT | Severe Thunderstorm Warning | OHX | Clay, Macon, Robertson, Sumner | 38 min |
| Jun 11, 9:58 PM EDT | Severe Thunderstorm Warning | OHX | Clay, Fentress, Pickett | 32 min |
| Jun 11, 10:12 PM EDT | Tornado Warning | OHX | Pickett | 18 min |
| Jun 11, 10:30 PM EDT | Severe Thunderstorm Warning | OHX | Cheatham, Robertson | 32 min |
| Jun 11, 10:37 PM EDT | Tornado Warning | OHX | Van Buren | 23 min |
| Jun 11, 10:53 PM EDT | Tornado Warning | MRX | Bledsoe | 37 min |
| Jun 11, 10:57 PM EDT | Severe Thunderstorm Warning | OHX | Van Buren | 18 min |
| Jun 11, 11:03 PM EDT | Severe Thunderstorm Warning | MRX | Bledsoe | 27 min |
| Jun 11, 11:12 PM EDT | Tornado Warning | OHX | Coffee, Grundy, Warren | 33 min |
| Jun 11, 11:27 PM EDT | Tornado Warning | MRX | Bledsoe, Hamilton, Rhea | 36 min |
| Jun 11, 11:46 PM EDT | Severe Thunderstorm Warning | MRX | Morgan, Scott | 42 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
Nashville Metro, TN (KBNA), launched 00:00Z, 1.3 hours before the alert went out and 46 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
- 2096 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 896 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 132 m²/s²
- 0-3 km storm-relative helicity
- 201 m²/s²
- Significant tornado parameter
- 1.6
- Supercell composite
- 8.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 8:47 PM EDT | Mesoscale Discussion | SPC | Adair, Allen, Barren, Bell, Calloway, Casey and 26 more | 58 min |
| Jun 11, 11:29 PM EDT | Mesoscale Discussion | SPC | Bell | 61 min |
| Jun 11, 8:24 PM EDT | Mesoscale Discussion | SPC | Alamance, Caswell, Chatham, Durham, Edgecombe, Franklin and 18 more | 66 min |
| Jun 12, 2:08 PM EDT | Mesoscale Discussion | SPC | Alamance, Alexander, Burke, Cabarrus, Catawba, Cleveland and 19 more | 67 min |
| Jun 12, 4:49 PM EDT | Severe Thunderstorm Watch | SPC | Beaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 32 more | 6 hr |
| Jun 12, 11:03 AM EDT | Mesoscale Discussion | SPC | Fayette, Shelby | 87 min |
| Jun 12, 12:35 PM EDT | Severe Thunderstorm Watch | SPC | Chester, Decatur, Fayette, Hardeman, Hardin, Haywood and 6 more | 9 hr |
| Jun 12, 2:30 PM EDT | Mesoscale Discussion | SPC | Shelby | 90 min |
| Jun 12, 4:01 PM EDT | Severe Thunderstorm Watch | SPC | Franklin, Lincoln, Moore | 7 hr |
| Jun 12, 4:22 PM EDT | Mesoscale Discussion | SPC | Fayette, Hardeman, McNairy, Shelby, Tipton | 83 min |
| Jun 12, 6:24 PM EDT | Mesoscale Discussion | SPC | Chester, Crockett, Decatur, Fayette, Franklin, Giles and 12 more | 96 min |
| Jun 12, 6:54 PM EDT | Severe Thunderstorm Watch | SPC | Bedford, Cannon, Coffee, Giles, Grundy, Hickman and 9 more | 5 hr |
Nearby
Tornado Watches in Tennessee, 2009Tornado Watches in Kentucky, 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.