Alert archive / Kentucky / Mesoscale Discussions in 2011

Mesoscale Discussion 537

April 23, 201120 counties in Kentucky; 11 counties in Ohio; 10 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2011, 3:56 PM EDT for 20 counties in Kentucky; 11 counties in Ohio; 10 counties in West Virginia. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued
Apr 23, 2011, 3:56 PM EDT (19:56 UTC)
Expired
Apr 23, 2011, 5:00 PM EDT
In force
64 min
Issued by
the Storm Prediction Center
All 41 counties

Bath County, KY, Bourbon County, KY, Boyd County, KY, Bracken County, KY, Carter County, KY, Clark County, KY, Elliott County, KY, Fayette County, KY, Fleming County, KY, Greenup County, KY, Harrison County, KY, Lawrence County, KY, Lewis County, KY, Mason County, KY, Montgomery County, KY, Nicholas County, KY, Pendleton County, KY, Robertson County, KY, Rowan County, KY, Scott County, KY, Adams County, OH, Athens County, OH, Brown County, OH, Gallia County, OH, Highland County, OH, Jackson County, OH, Lawrence County, OH, Meigs County, OH, Pike County, OH, Scioto County, OH, Vinton County, OH, Cabell County, WV, Jackson County, WV, Kanawha County, WV, Lincoln County, WV, Mason County, WV, Putnam County, WV, Roane County, WV, Wayne County, WV, Wirt County, WV, Wood County, WV

The radar

The Charleston,WV radar (KRLX), 99 km from the middle of the area, began a volume at 20:00 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.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 7.9 hours before the alert went out and 128 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-pSkew-T log-p diagram, Cncnati-Daytn, OH at 12:00Z on 2011-04-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 25 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cncnati-Daytn, OH at 12:00Z on 2011-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 405 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
25 J/kg
Mixed-layer CIN
-62 J/kg
Mixed-layer LCL
544 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
405 m²/s²
0-3 km storm-relative helicity
323 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

IssuedProductOfficeCountiesLasted
Apr 22, 10:20 PM EDTMesoscale DiscussionSPCAdair, Allen, Anderson, Ballard, Barren, Bath and 80 more55 min
Apr 23, 2:04 AM EDTTornado WatchSPCAdair, Anderson, Ballard, Barren, Boone, Bourbon and 67 more4 hr
Apr 23, 4:41 AM EDTMesoscale DiscussionSPCAnderson, Ballard, Bourbon, Boyle, Breckinridge, Bullitt and 45 more94 min
Apr 23, 5:22 AM EDTMesoscale DiscussionSPCAnderson, Boyle, Breckinridge, Bullitt, Butler, Caldwell and 24 more23 min
Apr 23, 11:51 AM EDTMesoscale DiscussionSPCAnderson, Bath, Boone, Bourbon, Boyd, Bracken and 43 more84 min
Apr 23, 2:04 PM EDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 17 more86 min
Apr 23, 3:30 PM EDTTornado WatchSPCAdair, Allen, Anderson, Barren, Boyle, Breckinridge and 46 more5 hr
Apr 23, 4:39 PM EDTSevere Thunderstorm WatchSPCBoyd, Carter, Greenup, Lawrence4 hr
Apr 23, 6:09 PM EDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 11 more2 hr
Apr 23, 6:38 PM EDTSevere Thunderstorm WatchSPCBallard, Carlisle, Fulton, Hickman6 hr
Apr 23, 7:35 PM EDTMesoscale DiscussionSPCAdair, Anderson, Barren, Bath, Bourbon, Boyle and 37 more55 min

Nearby

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