Alert archive / Kentucky / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 166
The Storm Prediction Center issued this severe thunderstorm watch at May 11, 2015, 4:56 PM EDT for 7 counties in Indiana; 24 counties in Kentucky. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 11, 2015, 4:56 PM EDT (20:56 UTC)
- Expired
- May 11, 2015, 9:40 PM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 31 counties
Clark County, IN, Crawford County, IN, Floyd County, IN, Harrison County, IN, Jefferson County, IN, Perry County, IN, Scott County, IN, Allen County, KY, Barren County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Edmonson County, KY, Grayson County, KY, Hancock County, KY, Hardin County, KY, Hart County, KY, Henry County, KY, Jefferson County, KY, Larue County, KY, Logan County, KY, Meade County, KY, Monroe County, KY, Nelson County, KY, Ohio County, KY, Oldham County, KY, Shelby County, KY, Simpson County, KY, Spencer County, KY, Trimble County, KY, Warren County, KY
The radar
The Louisville radar (KLVX), 39 km from the middle of the area, began a volume at 20:59 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 6:21 PM EDT | Severe Thunderstorm Warning | LMK | Bullitt, Jefferson | 29 min |
| May 11, 6:35 PM EDT | Severe Thunderstorm Warning | LMK | Oldham, Shelby | 20 min |
| May 11, 6:52 PM EDT | Severe Thunderstorm Warning | LMK | Henry, Shelby, Trimble | 20 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 12:00Z, 8.9 hours before the alert went out and 183 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
- 347 J/kg
- Mixed-layer CIN
- -65 J/kg
- Mixed-layer LCL
- 1481 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 119 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.9
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 12:48 PM EDT | Mesoscale Discussion | SPC | Adams, Allen, Bartholomew, Blackford, Brown, Dearborn and 36 more | 2 hr |
| May 11, 1:14 PM EDT | Tornado Watch | SPC | Adams, Allen, Bartholomew, Blackford, Boone, Brown and 49 more | 7 hr |
| May 11, 2:58 PM EDT | Mesoscale Discussion | SPC | Adams, Jay, Randolph, Union, Wayne | 62 min |
| May 11, 4:03 PM EDT | Mesoscale Discussion | SPC | Clark, Crawford, Floyd, Harrison, Perry, Washington | 2 hr |
| May 11, 4:39 PM EDT | Mesoscale Discussion | SPC | Adams, Dearborn, Decatur, Fayette, Franklin, Henry and 5 more | 66 min |
| May 11, 1:53 PM EDT | Mesoscale Discussion | SPC | Adair, Anderson, Barren, Bath, Bourbon, Boyd and 59 more | 3 hr |
| May 11, 2:19 PM EDT | Severe Thunderstorm Watch | SPC | Adair, Anderson, Bath, Bourbon, Boyd, Boyle and 61 more | 8 hr |
| May 11, 4:13 PM EDT | Mesoscale Discussion | SPC | Adair, Bath, Bourbon, Boyd, Boyle, Bracken and 41 more | 92 min |
| May 11, 6:23 PM EDT | Mesoscale Discussion | SPC | Anderson, Bath, Boone, Bourbon, Boyle, Bracken and 33 more | 97 min |
| May 11, 3:24 PM EDT | Mesoscale Discussion | SPC | Anderson, Blount, Carter, Cocke, Grainger, Greene and 15 more | 3 hr |
Nearby
Severe Thunderstorm Watches in Kentucky, 2015Severe Thunderstorm Watches in Indiana, 2015Every severe thunderstorm watch in 2015
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.