Alert archive / Kentucky / Severe Thunderstorm Watches in 2009
Severe Thunderstorm Watch 657
The Storm Prediction Center issued this severe thunderstorm watch at Aug 4, 2009, 12:21 PM CDT for Spencer County, Vanderburgh County, Warrick County, Indiana; 64 counties in Kentucky. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 4, 2009, 12:21 PM CDT (17:21 UTC)
- Expired
- Aug 4, 2009, 6:58 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 67 counties
Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Adair County, KY, Allen County, KY, Anderson County, KY, Barren County, KY, Bell County, KY, Bourbon County, KY, Boyle County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Casey County, KY, Clark County, KY, Clay County, KY, Clinton County, KY, Cumberland County, KY, Daviess County, KY, Edmonson County, KY, Estill County, KY, Fayette County, KY, Franklin County, KY, Garrard County, KY, Grayson County, KY, Green County, KY, Hancock County, KY, Hardin County, KY, Harrison County, KY, Hart County, KY, Henderson County, KY, Jackson County, KY, Jessamine County, KY, Knox County, KY, Larue County, KY, Laurel County, KY, Lee County, KY, Lincoln County, KY, Logan County, KY, Madison County, KY, Marion County, KY, McCreary County, KY, McLean County, KY, Meade County, KY, Mercer County, KY, Metcalfe County, KY, Monroe County, KY, Montgomery County, KY, Muhlenberg County, KY, Nelson County, KY, Nicholas County, KY, Ohio County, KY, Owsley County, KY, Powell County, KY, Pulaski County, KY, Rockcastle County, KY, Russell County, KY, Scott County, KY, Shelby County, KY, Simpson County, KY, Spencer County, KY, Taylor County, KY, Warren County, KY, Washington County, KY, Wayne County, KY, Whitley County, KY, Woodford County, KY
The radar
The Louisville radar (KLVX), 27 km from the middle of the area, began a volume at 17:23 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
- 5%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 80%
- One or more gusts of 65 knots or more
- 30%
- 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
- 95%
Warnings issued inside it
25 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 12:54 PM CDT | Severe Thunderstorm Warning | LMK | Jefferson, Oldham, Shelby | 36 min |
| Aug 4, 12:56 PM CDT | Flash Flood Warning | LMK | Bourbon, Harrison, Nicholas, Scott | 4 hr |
| Aug 4, 1:20 PM CDT | Severe Thunderstorm Warning | JKL | Bell, Clay, Knox | 40 min |
| Aug 4, 1:31 PM CDT | Severe Thunderstorm Warning | LMK | Bourbon, Clark, Fayette, Harrison, Jessamine, Scott and 1 more | 29 min |
| Aug 4, 1:40 PM CDT | Severe Thunderstorm Warning | JKL | Bell, Harlan, Knox | 50 min |
| Aug 4, 1:47 PM CDT | Flash Flood Warning | JKL | Bath, Breathitt, Estill, Lee, Menifee, Montgomery and 2 more | 13 min |
| Aug 4, 1:55 PM CDT | Flash Flood Warning | LMK | Franklin | 3 hr |
| Aug 4, 1:57 PM CDT | Flash Flood Warning | JKL | Bath, Breathitt, Estill, Lee, Menifee, Montgomery and 3 more | 4 hr |
| Aug 4, 1:59 PM CDT | Severe Thunderstorm Warning | LMK | Bourbon, Clark, Fayette, Madison | 46 min |
| Aug 4, 2:06 PM CDT | Severe Thunderstorm Warning | JKL | Bath, Fleming, Menifee, Montgomery, Powell, Rowan | 39 min |
| Aug 4, 2:12 PM CDT | Flash Flood Warning | LMK | Fayette | 4 hr |
| Aug 4, 2:18 PM CDT | Flash Flood Warning | LMK | Clark | 3 hr |
| Aug 4, 2:26 PM CDT | Flash Flood Warning | JKL | Bell, Knox | 4 hr |
| Aug 4, 2:27 PM CDT | Severe Thunderstorm Warning | JKL | Bath, Breathitt, Estill, Lee, Menifee, Montgomery and 4 more | 48 min |
| Aug 4, 2:30 PM CDT | Severe Thunderstorm Warning | JKL | McCreary, Pulaski, Wayne, Whitley | 45 min |
| Aug 4, 2:42 PM CDT | Severe Thunderstorm Warning | LMK | Madison | 34 min |
| Aug 4, 2:51 PM CDT | Flash Flood Warning | LMK | Madison | 2 hr |
| Aug 4, 2:57 PM CDT | Severe Thunderstorm Warning | PAH | Muhlenberg | 33 min |
| Aug 4, 3:10 PM CDT | Severe Thunderstorm Warning | LMK | Butler, Edmonson, Warren | 35 min |
| Aug 4, 3:15 PM CDT | Severe Thunderstorm Warning | JKL | Knox, Laurel, McCreary, Pulaski, Whitley | 45 min |
| Aug 4, 3:32 PM CDT | Severe Thunderstorm Warning | PAH | Muhlenberg, Todd | 43 min |
| Aug 4, 3:58 PM CDT | Severe Thunderstorm Warning | JKL | Bell, Clay, Knox, Laurel, Leslie | 32 min |
| Aug 4, 4:09 PM CDT | Severe Thunderstorm Warning | LMK | Warren | 25 min |
| Aug 4, 5:13 PM CDT | Severe Thunderstorm Warning | LMK | Logan, Simpson | 32 min |
| Aug 4, 6:56 PM CDT | Flash Flood Warning | LMK | Butler, Ohio | 3 hr |
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 12:00Z, 5.4 hours before the alert went out and 186 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
- 3443 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 680 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 80 m²/s²
- 0-3 km storm-relative helicity
- 42 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.8
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 4:37 AM CDT | Mesoscale Discussion | SPC | Adams, Bartholomew, Blackford, Brown, Dearborn, Decatur and 24 more | 53 min |
| Aug 4, 7:39 AM CDT | Severe Thunderstorm Watch | SPC | Benton | 4 hr |
| Aug 4, 8:24 AM CDT | Mesoscale Discussion | SPC | Bartholomew, Boone, Brown, Clay, Clinton, Dearborn and 33 more | 36 min |
| Aug 4, 8:41 AM CDT | Severe Thunderstorm Watch | SPC | Bartholomew, Boone, Brown, Carroll, Clark, Clay and 51 more | 6 hr |
| Aug 4, 8:47 AM CDT | Mesoscale Discussion | SPC | Bartholomew, Boone, Clark, Dearborn, Decatur, Fayette and 20 more | 58 min |
| Aug 4, 11:41 AM CDT | Mesoscale Discussion | SPC | Clark, Crawford, Dubois, Floyd, Harrison, Jackson and 10 more | 94 min |
| Aug 4, 5:45 PM CDT | Mesoscale Discussion | SPC | Perry, Spencer | 90 min |
| Aug 4, 2:36 PM CDT | Mesoscale Discussion | SPC | Adair, Allen, Ballard, Barren, Boyle, Butler and 44 more | 84 min |
| Aug 4, 3:09 PM CDT | Severe Thunderstorm Watch | SPC | Ballard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 13 more | 7 hr |
| Aug 4, 3:29 PM CDT | Severe Thunderstorm Watch | SPC | Harlan, Knott, Leslie, Letcher, Perry | 6 hr |
| Aug 4, 6:21 PM CDT | Mesoscale Discussion | SPC | Ballard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 11 more | 114 min |
Nearby
Severe Thunderstorm Watches in Kentucky, 2009Severe Thunderstorm Watches in Indiana, 2009Every severe thunderstorm 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.