Alert archive / Kentucky / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 111

April 9, 20114 states

The Storm Prediction Center issued this severe thunderstorm watch at Apr 9, 2011, 7:25 AM CDT for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Apr 9, 2011, 7:25 AM CDT (12:25 UTC)
Expired: Apr 9, 2011, 1:00 PM CDT
In force: 6 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 129 counties

Edwards County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Johnson County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Wabash County, IL, Wayne County, IL, White County, IL, Bartholomew County, IN, Brown County, IN, Clark County, IN, Crawford County, IN, Daviess County, IN, Dubois County, IN, Floyd County, IN, Gibson County, IN, Greene County, IN, Harrison County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Monroe County, IN, Orange County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Ripley County, IN, Scott County, IN, Spencer County, IN, Sullivan County, IN, Switzerland County, IN, Vanderburgh County, IN, Warrick County, IN, Washington County, IN, Adair County, KY, Allen County, KY, Anderson County, KY, Ballard County, KY, Barren County, KY, Bourbon County, KY, Boyle County, KY, Bracken County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Carroll County, KY, Casey County, KY, Christian County, KY, Clark County, KY, Clinton County, KY, Crittenden County, KY, Cumberland County, KY, Daviess County, KY, Edmonson County, KY, Fayette County, KY, Franklin County, KY, Fulton County, KY, Gallatin County, KY, Garrard County, KY, Grant County, KY, Graves County, KY, Grayson County, KY, Green County, KY, Hancock County, KY, Hardin County, KY, Harrison County, KY, Hart County, KY, Henderson County, KY, Henry County, KY, Hickman County, KY, Hopkins County, KY, Jefferson County, KY, Jessamine County, KY, Larue County, KY, Lincoln County, KY, Livingston County, KY, Logan County, KY, Lyon County, KY, Madison County, KY, Marion County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Meade County, KY, Mercer County, KY, Metcalfe County, KY, Monroe County, KY, Muhlenberg County, KY, Nelson County, KY, Nicholas County, KY, Ohio County, KY, Oldham County, KY, Owen County, KY, Pendleton County, KY, Robertson County, KY, Russell County, KY, Scott County, KY, Shelby County, KY, Simpson County, KY, Spencer County, KY, Taylor County, KY, Todd County, KY, Trigg County, KY, Trimble County, KY, Union County, KY, Warren County, KY, Washington County, KY, Webster County, KY, Woodford County, KY, Clay County, TN, Jackson County, TN, Macon County, TN, Montgomery County, TN, Overton County, TN, Pickett County, TN, Robertson County, TN, Stewart County, TN, Sumner County, TN, Trousdale County, TN

The radar

The Evansville,IN radar (KVWX), 88 km from the middle of the area, began a volume at 12:25 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: 20%
One or more EF2 to EF5 tornadoes: 5%
Ten or more severe wind reports: 50%
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: 40%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

29 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Apr 9, 7:27 AM CDT	Severe Thunderstorm Warning	IND	Clay, Greene, Sullivan, Vigo	48 min
Apr 9, 7:53 AM CDT	Severe Thunderstorm Warning	PAH	White	37 min
Apr 9, 7:55 AM CDT	Severe Thunderstorm Warning	PAH	Edwards, Wabash	35 min
Apr 9, 8:03 AM CDT	Severe Thunderstorm Warning	IND	Greene, Knox, Sullivan	27 min
Apr 9, 8:05 AM CDT	Severe Thunderstorm Warning	PAH	Edwards, Wabash, White	40 min
Apr 9, 8:06 AM CDT	Severe Thunderstorm Warning	IND	Daviess, Knox, Sullivan	39 min
Apr 9, 8:22 AM CDT	Severe Thunderstorm Warning	IND	Greene, Monroe, Owen	38 min
Apr 9, 8:31 AM CDT	Severe Thunderstorm Warning	IND	Daviess, Greene, Knox, Sullivan	44 min
Apr 9, 8:47 AM CDT	Flash Flood Warning	IND	Greene, Owen, Sullivan, Vigo	5 hr
Apr 9, 8:48 AM CDT	Severe Thunderstorm Warning	PAH	Pike	27 min
Apr 9, 8:54 AM CDT	Severe Thunderstorm Warning	LMK	Crawford, Dubois, Orange	36 min
Apr 9, 9:10 AM CDT	Flash Flood Warning	IND	Brown, Daviess, Lawrence, Martin, Monroe	4 hr
Apr 9, 9:12 AM CDT	Severe Thunderstorm Warning	LMK	Crawford, Dubois, Perry	33 min
Apr 9, 9:15 AM CDT	Severe Thunderstorm Warning	PAH	Spencer	10 min
Apr 9, 9:21 AM CDT	Severe Thunderstorm Warning	IND	Jackson, Lawrence	39 min
Apr 9, 9:22 AM CDT	Severe Thunderstorm Warning	LMK	Crawford, Harrison, Orange, Washington	23 min
Apr 9, 9:35 AM CDT	Severe Thunderstorm Warning	LMK	Crawford, Floyd, Harrison	25 min
Apr 9, 9:55 AM CDT	Severe Thunderstorm Warning	LMK	Clark, Floyd	35 min
Apr 9, 10:16 AM CDT	Severe Thunderstorm Warning	LMK	Bullitt, Jefferson, Shelby, Spencer	29 min
Apr 9, 10:21 AM CDT	Severe Thunderstorm Warning	LMK	Clark	24 min
Apr 9, 10:32 AM CDT	Severe Thunderstorm Warning	LMK	Anderson, Franklin, Shelby	28 min
Apr 9, 10:40 AM CDT	Severe Thunderstorm Warning	ILN	Boone, Campbell, Carroll, Gallatin, Grant, Kenton and 2 more	50 min
Apr 9, 10:52 AM CDT	Severe Thunderstorm Warning	LMK	Anderson, Woodford	23 min
Apr 9, 12:07 PM CDT	Severe Thunderstorm Warning	LMK	Nelson, Washington	23 min
Apr 9, 12:13 PM CDT	Severe Thunderstorm Warning	LMK	Adair, Casey, Taylor	32 min
Apr 9, 12:23 PM CDT	Severe Thunderstorm Warning	LMK	Clark, Madison	22 min
Apr 9, 12:25 PM CDT	Severe Thunderstorm Warning	LMK	Casey, Lincoln	35 min
Apr 9, 12:38 PM CDT	Severe Thunderstorm Warning	LMK	Garrard, Lincoln	37 min
Apr 9, 12:57 PM CDT	Tornado Warning	LMK	Casey	3 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, 0.4 hours before the alert went out and 169 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2430 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 760 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 125 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 9, 4:12 AM CDT	Mesoscale Discussion	SPC	Bond, Calhoun, Cass, Christian, Clark, Clay and 31 more	93 min
Apr 9, 6:41 AM CDT	Mesoscale Discussion	SPC	Edwards, Gallatin, Hamilton, Hardin, Johnson, Lawrence and 10 more	2 hr
Apr 8, 10:07 PM CDT	Severe Thunderstorm Watch	SPC	Breathitt, Estill, Floyd, Knott, Lee, Letcher and 6 more	6 hr
Apr 8, 11:42 PM CDT	Mesoscale Discussion	SPC	Knott, Letcher, Perry	93 min
Apr 9, 11:07 AM CDT	Mesoscale Discussion	SPC	Bath, Bell, Breathitt, Clark, Clay, Clinton and 25 more	83 min
Apr 9, 11:34 AM CDT	Severe Thunderstorm Watch	SPC	Bath, Bell, Boyd, Breathitt, Carter, Clay and 30 more	4 hr
Apr 9, 1:00 PM CDT	Tornado Watch	SPC	Bell, Boyd, Breathitt, Carter, Clay, Elliott and 27 more	7 hr
Apr 9, 2:23 AM CDT	Mesoscale Discussion	SPC	Carter, Johnson, Sullivan	67 min
Apr 9, 3:21 PM CDT	Mesoscale Discussion	SPC	Anderson, Blount, Bradley, Campbell, Carter, Claiborne and 21 more	84 min

Nearby

Severe Thunderstorm Watches in Kentucky, 2011 Severe Thunderstorm Watches in Indiana, 2011 Severe Thunderstorm Watches in Illinois, 2011 Every severe thunderstorm watch in 2011

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.