Alert archive / Kentucky / Mesoscale Discussions in 2012

Mesoscale Discussion 1612

July 26, 201236 counties in Kentucky; 4 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 26, 2012, 4:57 PM EDT for 36 counties in Kentucky; 4 counties in West Virginia. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jul 26, 2012, 4:57 PM EDT (20:57 UTC)
Expired
Jul 26, 2012, 7:00 PM EDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 40 counties

Bath County, KY, Bourbon County, KY, Breathitt County, KY, Carter County, KY, Casey County, KY, Clark County, KY, Clay County, KY, Elliott County, KY, Estill County, KY, Fayette County, KY, Fleming County, KY, Floyd County, KY, Garrard County, KY, Jackson County, KY, Jessamine County, KY, Johnson County, KY, Knott County, KY, Laurel County, KY, Lawrence County, KY, Lee County, KY, Lincoln County, KY, Madison County, KY, Magoffin County, KY, Martin County, KY, Menifee County, KY, Montgomery County, KY, Morgan County, KY, Nicholas County, KY, Owsley County, KY, Perry County, KY, Pike County, KY, Powell County, KY, Pulaski County, KY, Rockcastle County, KY, Rowan County, KY, Wolfe County, KY, Boone County, WV, Logan County, WV, Mingo County, WV, Wayne County, WV

The radar

The Jackson,KY radar (KJKL), 58 km from the middle of the area, began a volume at 20:57 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, 9.0 hours before the alert went out and 202 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 2012-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1791 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 2012-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 262 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
1791 J/kg
Mixed-layer CIN
-143 J/kg
Mixed-layer LCL
1055 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
262 m²/s²
0-3 km storm-relative helicity
287 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.4

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
Jul 26, 12:26 PM EDTMesoscale DiscussionSPCBoone, Bracken, Campbell, Carroll, Gallatin, Grant and 11 more2 hr
Jul 26, 1:16 PM EDTSevere Thunderstorm WatchSPCBoone, Bracken, Campbell, Carroll, Gallatin, Grant and 7 more9 hr
Jul 26, 2:25 PM EDTMesoscale DiscussionSPCBallard, Carlisle, Livingston, McCracken65 min
Jul 26, 2:46 PM EDTSevere Thunderstorm WatchSPCAdair, Allen, Anderson, Ballard, Barren, Bourbon and 65 more10 hr
Jul 26, 3:37 PM EDTMesoscale DiscussionSPCBoone, Boyd, Bracken, Campbell, Carter, Fleming and 8 more113 min
Jul 26, 4:55 PM EDTMesoscale DiscussionSPCAnderson, Ballard, Breckinridge, Bullitt, Butler, Caldwell and 39 more35 min
Jul 26, 6:06 PM EDTMesoscale DiscussionSPCBoyd, Greenup, Lewis84 min
Jul 26, 6:26 PM EDTSevere Thunderstorm WatchSPCBath, Boyd, Breathitt, Carter, Clay, Elliott and 24 more7 hr
Jul 26, 7:29 PM EDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Crittenden, Fulton and 10 more61 min
Jul 26, 4:31 AM EDTMesoscale DiscussionSPCBrooke, Doddridge, Hancock, Harrison, Marion, Marshall and 8 more89 min
Jul 26, 3:08 PM EDTMesoscale DiscussionSPCHampshire, Hardy, Jefferson2 hr
Jul 26, 5:54 PM EDTSevere Thunderstorm WatchSPCBerkeley, Grant, Hampshire, Hardy, Jefferson, Mineral and 2 more6 hr

Nearby

Mesoscale Discussions in Kentucky, 2012Mesoscale Discussions in West Virginia, 2012Every mesoscale discussion in 2012

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.