Alert archive / Indiana / Tornado Watches in 2010

Tornado Watch 121

May 1, 201041 counties in Indiana; 23 counties in Kentucky

The Storm Prediction Center issued this tornado watch at May 1, 2010, 2:11 AM EDT for 41 counties in Indiana; 23 counties in Kentucky. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: May 1, 2010, 2:11 AM EDT (06:11 UTC)
Expired: May 1, 2010, 8:00 AM EDT
In force: 6 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1 in
Strongest gust expected: 65 kt

All 64 counties

Bartholomew County, IN, Boone County, IN, Brown County, IN, Clay County, IN, Crawford County, IN, Daviess County, IN, Decatur County, IN, Dubois County, IN, Fountain County, IN, Gibson County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Harrison County, IN, Hendricks County, IN, Jackson County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Orange County, IN, Owen County, IN, Parke County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Putnam County, IN, Rush County, IN, Shelby County, IN, Spencer County, IN, Sullivan County, IN, Vanderburgh County, IN, Vermillion County, IN, Vigo County, IN, Warrick County, IN, Washington County, IN, Breckinridge County, KY, Butler County, KY, Caldwell County, KY, Calloway County, KY, Christian County, KY, Crittenden County, KY, Daviess County, KY, Grayson County, KY, Hancock County, KY, Henderson County, KY, Hopkins County, KY, Livingston County, KY, Logan County, KY, Lyon County, KY, Marshall County, KY, McLean County, KY, Meade County, KY, Muhlenberg County, KY, Ohio County, KY, Todd County, KY, Trigg County, KY, Union County, KY, Webster County, KY

The radar

The Evansville,IN radar (KVWX), 40 km from the middle of the area, began a volume at 06:11 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: 10%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 5%
One or more hailstones of 2 inches or more: 5%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 1, 2:29 AM EDT	Severe Thunderstorm Warning	IND	Clay, Greene, Owen, Parke, Putnam	46 min
May 1, 2:43 AM EDT	Severe Thunderstorm Warning	IND	Daviess, Greene, Martin	47 min
May 1, 2:47 AM EDT	Severe Thunderstorm Warning	LMK	Dubois	43 min
May 1, 2:59 AM EDT	Severe Thunderstorm Warning	IND	Lawrence, Monroe	46 min
May 1, 3:13 AM EDT	Severe Thunderstorm Warning	LMK	Crawford, Dubois, Orange, Perry	32 min
May 1, 3:52 AM EDT	Severe Thunderstorm Warning	LMK	Clark, Scott, Washington	23 min
May 1, 3:57 AM EDT	Tornado Warning	PAH	Calloway, Trigg	33 min
May 1, 4:22 AM EDT	Tornado Warning	PAH	Christian, Trigg	38 min
May 1, 4:55 AM EDT	Severe Thunderstorm Warning	LMK	Harrison	35 min
May 1, 4:56 AM EDT	Tornado Warning	PAH	Christian, Todd	34 min
May 1, 5:17 AM EDT	Severe Thunderstorm Warning	LMK	Logan	28 min
May 1, 5:34 AM EDT	Severe Thunderstorm Warning	LMK	Butler	26 min
May 1, 5:50 AM EDT	Flash Flood Warning	LMK	Dubois, Orange	3 hr
May 1, 5:51 AM EDT	Severe Thunderstorm Warning	LMK	Allen, Butler, Edmonson, Logan, Simpson, Warren	39 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, 6.2 hours before the alert went out and 227 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2086 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 110 m²/s²
0-3 km storm-relative helicity: 154 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 30, 8:12 PM EDT	Mesoscale Discussion	SPC	Bond, Brown, Calhoun, Cass, Christian, Clinton and 29 more	63 min
Apr 30, 8:32 PM EDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, DeKalb, DuPage, Grundy and 16 more	58 min
Apr 30, 9:36 PM EDT	Mesoscale Discussion	SPC	Alexander, Bond, Christian, Clay, Clinton, Coles and 32 more	54 min
Apr 30, 10:03 PM EDT	Tornado Watch	SPC	Alexander, Bond, Champaign, Christian, Clark, Clay and 47 more	6 hr
May 1, 12:41 AM EDT	Mesoscale Discussion	SPC	Alexander, Bond, Champaign, Christian, Clark, Clay and 39 more	64 min
May 1, 3:54 AM EDT	Mesoscale Discussion	SPC	Bartholomew, Blackford, Clark, Crawford, Dearborn, Decatur and 30 more	2 hr
May 1, 5:40 AM EDT	Tornado Watch	SPC	Adair, Allen, Barren, Boyle, Bullitt, Casey and 21 more	4 hr
May 1, 7:17 AM EDT	Mesoscale Discussion	SPC	Adair, Barren, Bath, Boyle, Casey, Clark and 25 more	88 min

Nearby

Tornado Watches in Indiana, 2010 Tornado Watches in Kentucky, 2010 Every tornado watch in 2010

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.