Alert archive / Kentucky / Mesoscale Discussions in 2011

Mesoscale Discussion 909

May 23, 201125 counties in Kentucky; 21 counties in Ohio; 22 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at May 23, 2011, 7:20 PM EDT for 25 counties in Kentucky; 21 counties in Ohio; 22 counties in West Virginia. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: May 23, 2011, 7:20 PM EDT (23:20 UTC)
Expired: May 23, 2011, 8:45 PM EDT
In force: 85 min
Issued by: the Storm Prediction Center

All 68 counties

Bath County, KY, Boyd County, KY, Breathitt County, KY, Carter County, KY, Elliott County, KY, Estill County, KY, Fleming County, KY, Floyd County, KY, Greenup County, KY, Jackson County, KY, Johnson County, KY, Knott County, KY, Lawrence County, KY, Lee County, KY, Lewis County, KY, Magoffin County, KY, Martin County, KY, Menifee County, KY, Montgomery County, KY, Morgan County, KY, Owsley County, KY, Pike County, KY, Powell County, KY, Rowan County, KY, Wolfe County, KY, Athens County, OH, Belmont County, OH, Coshocton County, OH, Gallia County, OH, Guernsey County, OH, Harrison County, OH, Hocking County, OH, Jackson County, OH, Jefferson County, OH, Lawrence County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pike County, OH, Scioto County, OH, Tuscarawas County, OH, Vinton County, OH, Washington County, OH, Boone County, WV, Brooke County, WV, Cabell County, WV, Calhoun County, WV, Doddridge County, WV, Jackson County, WV, Kanawha County, WV, Lincoln County, WV, Logan County, WV, Marshall County, WV, Mason County, WV, Mingo County, WV, Ohio County, WV, Pleasants County, WV, Putnam County, WV, Ritchie County, WV, Roane County, WV, Tyler County, WV, Wayne County, WV, Wetzel County, WV, Wirt County, WV, Wood County, WV

The radar

The Charleston,WV radar (KRLX), 98 km from the middle of the area, began a volume at 23:22 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 349May 23, 8:30 PM EDT

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 11.3 hours before the alert went out and 160 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: 170 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 776 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 183 m²/s²
0-3 km storm-relative helicity: 246 m²/s²
Significant tornado parameter: 0.2
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 23, 4:20 AM EDT	Mesoscale Discussion	SPC	Adair, Allen, Anderson, Barren, Bath, Bell and 76 more	85 min
May 23, 11:55 AM EDT	Severe Thunderstorm Watch	SPC	Ballard, Carlisle, Fulton, Hickman	7 hr
May 23, 3:52 PM EDT	Mesoscale Discussion	SPC	Boone, Campbell, Carroll, Gallatin, Grant, Henry and 7 more	53 min
May 23, 4:28 PM EDT	Severe Thunderstorm Watch	SPC	Anderson, Boone, Bourbon, Bracken, Breckinridge, Bullitt and 30 more	6 hr
May 23, 4:58 PM EDT	Mesoscale Discussion	SPC	Ballard, Carlisle, Fulton, Hickman	92 min
May 23, 5:24 PM EDT	Mesoscale Discussion	SPC	Allen, Barren, Butler, Caldwell, Calloway, Christian and 20 more	96 min
May 23, 5:57 PM EDT	Severe Thunderstorm Watch	SPC	Allen, Barren, Butler, Caldwell, Calloway, Christian and 23 more	4 hr
May 23, 6:20 PM EDT	Mesoscale Discussion	SPC	Anderson, Boone, Bourbon, Bracken, Breckinridge, Bullitt and 27 more	55 min
May 22, 8:20 PM EDT	Mesoscale Discussion	SPC	Defiance, Fulton, Henry, Mercer, Paulding, Putnam and 2 more	115 min
May 23, 8:25 AM EDT	Mesoscale Discussion	SPC	Allen, Ashland, Ashtabula, Auglaize, Champaign, Clark and 40 more	65 min
May 23, 12:35 PM EDT	Mesoscale Discussion	SPC	Allen, Auglaize, Defiance, Fulton, Henry, Lucas and 6 more	85 min
May 23, 2:15 PM EDT	Severe Thunderstorm Watch	SPC	Allen, Defiance, Fulton, Hancock, Henry, Lucas and 8 more	8 hr
May 23, 6:40 PM EDT	Mesoscale Discussion	SPC	Allen, Auglaize, Defiance, Fulton, Hancock, Henry and 7 more	65 min
May 22, 9:02 PM EDT	Mesoscale Discussion	SPC	Monroe	58 min
May 23, 10:33 AM EDT	Mesoscale Discussion	SPC	Berkeley, Grant, Hampshire, Hardy, Jefferson, Mineral and 5 more	87 min
May 23, 10:48 AM EDT	Severe Thunderstorm Watch	SPC	Berkeley, Grant, Hampshire, Hardy, Jefferson, Mineral and 2 more	9 hr
May 23, 2:33 PM EDT	Mesoscale Discussion	SPC	Berkeley, Grant, Hampshire, Hardy, Jefferson, Mineral and 2 more	87 min
May 23, 4:40 PM EDT	Mesoscale Discussion	SPC	Berkeley, Jefferson	95 min

Nearby

Mesoscale Discussions in Kentucky, 2011 Mesoscale Discussions in West Virginia, 2011 Mesoscale Discussions in Ohio, 2011 Every mesoscale discussion 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.