Alert archive / Kentucky / Mesoscale Discussions in 2015

Mesoscale Discussion 615

May 11, 20156 counties in Indiana; 20 counties in Kentucky; Montgomery County, Robertson County, Sumner County, Tennessee

The Storm Prediction Center issued this mesoscale discussion at May 11, 2015, 4:03 PM EDT for 6 counties in Indiana; 20 counties in Kentucky; Montgomery County, Robertson County, Sumner County, Tennessee. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 11, 2015, 4:03 PM EDT (20:03 UTC)
Expired: May 11, 2015, 6:30 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 29 counties

Clark County, IN, Crawford County, IN, Floyd County, IN, Harrison County, IN, Perry County, IN, Washington 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, Jefferson County, KY, Larue County, KY, Logan County, KY, Meade County, KY, Muhlenberg County, KY, Ohio County, KY, Oldham County, KY, Simpson County, KY, Todd County, KY, Warren County, KY, Montgomery County, TN, Robertson County, TN, Sumner County, TN

The radar

The Louisville radar (KLVX), 84 km from the middle of the area, began a volume at 20:06 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.

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 166May 11, 4:55 PM EDT

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 8.1 hours before the alert went out and 137 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: 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

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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, 4:39 PM EDT	Mesoscale Discussion	SPC	Adams, Dearborn, Decatur, Fayette, Franklin, Henry and 5 more	66 min
May 11, 4:56 PM EDT	Severe Thunderstorm Watch	SPC	Clark, Crawford, Floyd, Harrison, Jefferson, Perry and 1 more	5 hr
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

Mesoscale Discussions in Kentucky, 2015 Mesoscale Discussions in Indiana, 2015 Mesoscale Discussions in Tennessee, 2015 Every mesoscale discussion 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.