Alert archive / Kentucky / Mesoscale Discussions in 2013

Mesoscale Discussion 761

May 21, 20136 states

The Storm Prediction Center issued this mesoscale discussion at May 21, 2013, 7:00 PM EDT for 6 states. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
May 21, 2013, 7:00 PM EDT (23:00 UTC)
Expired
May 21, 2013, 8:00 PM EDT
In force
60 min
Issued by
the Storm Prediction Center
All 67 counties

Bath County, KY, Bell County, KY, Boyd County, KY, Breathitt County, KY, Carter County, KY, Clay County, KY, Elliott County, KY, Fleming County, KY, Floyd County, KY, Greenup County, KY, Harlan County, KY, Johnson County, KY, Knott County, KY, Lawrence County, KY, Lee County, KY, Leslie County, KY, Letcher County, KY, Lewis County, KY, Magoffin County, KY, Martin County, KY, Mason County, KY, Menifee County, KY, Morgan County, KY, Owsley County, KY, Perry County, KY, Pike County, KY, Rowan County, KY, Wolfe County, KY, Clay County, NC, Graham County, NC, Macon County, NC, Swain County, NC, Adams County, OH, Lawrence County, OH, Scioto County, OH, Blount County, TN, Claiborne County, TN, Cocke County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Knox County, TN, Sevier County, TN, Sullivan County, TN, Union County, TN, Washington County, TN, Buchanan County, VA, City of Bristol, VA, City of Norton, VA, Dickenson County, VA, Lee County, VA, Russell County, VA, Scott County, VA, Washington County, VA, Wise County, VA, Boone County, WV, Cabell County, WV, Lincoln County, WV, Logan County, WV, McDowell County, WV, Mingo County, WV, Raleigh County, WV, Wayne County, WV, Wyoming County, WV

The radar

The Jackson,KY radar (KJKL), 79 km from the middle of the area, began a volume at 23:00 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 nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 11.0 hours before the alert went out and 287 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 2013-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 123 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 2013-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -124 square meters per square second.193958Sfc1 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
123 J/kg
Mixed-layer CIN
-270 J/kg
Mixed-layer LCL
1230 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
-124 m²/s²
0-3 km storm-relative helicity
-97 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

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
May 20, 11:25 PM EDTMesoscale DiscussionSPCBallard, Carlisle, Fulton, Graves, Hickman, Livingston and 2 more65 min
May 20, 11:56 PM EDTTornado WatchSPCBallard, Caldwell, Calloway, Carlisle, Crittenden, Fulton and 9 more6 hr
May 21, 3:59 AM EDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Crittenden, Graves and 8 more91 min
May 21, 8:47 AM EDTMesoscale DiscussionSPCFulton58 min
May 21, 12:27 PM EDTMesoscale DiscussionSPCAdair, Allen, Barren, Clinton, Cumberland, Logan and 7 more63 min
May 21, 3:12 PM EDTMesoscale DiscussionSPCAdair, Anderson, Bell, Boyle, Breathitt, Casey and 36 more63 min
May 21, 3:26 PM EDTSevere Thunderstorm WatchSPCAdair, Anderson, Bath, Bell, Bourbon, Boyd and 55 more7 hr
May 21, 1:50 AM EDTSevere Thunderstorm WatchSPCCrockett, Dyer, Fayette, Gibson, Haywood, Lake and 5 more3 hr
May 21, 3:42 PM EDTMesoscale DiscussionSPCBenton, Carroll, Chester, Crockett, Decatur, Dyer and 14 more63 min
May 21, 4:00 PM EDTTornado WatchSPCCarroll, Chester, Crockett, Decatur, Dyer, Fayette and 14 more7 hr
May 21, 7:23 PM EDTMesoscale DiscussionSPCBenton, Carroll, Chester, Crockett, Decatur, Fayette and 13 more67 min

Nearby

Mesoscale Discussions in Kentucky, 2013Mesoscale Discussions in Tennessee, 2013Mesoscale Discussions in Virginia, 2013Every mesoscale discussion in 2013

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.