Alert archive / Kentucky / Mesoscale Discussions in 2011

Mesoscale Discussion 540

April 23, 201143 counties in Kentucky

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2011, 6:35 PM CDT for 43 counties in Kentucky. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued
Apr 23, 2011, 6:35 PM CDT (23:35 UTC)
Expired
Apr 23, 2011, 7:30 PM CDT
In force
55 min
Issued by
the Storm Prediction Center
All 43 counties

Adair County, KY, Anderson County, KY, Barren County, KY, Bath County, KY, Bourbon County, KY, Boyle County, KY, Bullitt County, KY, Casey County, KY, Clark County, KY, Edmonson County, KY, Estill County, KY, Fayette County, KY, Fleming County, KY, Franklin County, KY, Garrard County, KY, Grayson County, KY, Green County, KY, Hardin County, KY, Hart County, KY, Jackson County, KY, Jefferson County, KY, Jessamine County, KY, Larue County, KY, Lee County, KY, Lincoln County, KY, Madison County, KY, Marion County, KY, Menifee County, KY, Mercer County, KY, Montgomery County, KY, Nelson County, KY, Nicholas County, KY, Powell County, KY, Rockcastle County, KY, Rowan County, KY, Scott County, KY, Shelby County, KY, Spencer County, KY, Taylor County, KY, Warren County, KY, Washington County, KY, Wolfe County, KY, Woodford County, KY

The radar

The Louisville radar (KLVX), 94 km from the middle of the area, began a volume at 23:35 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, 11.6 hours before the alert went out and 212 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.

922 
ACUS11 KWNS 232335
SWOMCD
SPC MCD 232335 
KYZ000-INZ000-240030-

MESOSCALE DISCUSSION 0540
NWS STORM PREDICTION CENTER NORMAN OK
0635 PM CDT SAT APR 23 2011

AREAS AFFECTED...CNTRL/ERN KY

CONCERNING...TORNADO WATCH 186...

VALID 232335Z - 240030Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 186 CONTINUES.

FORWARD PROPAGATING MCS CONTINUES TO PROGRESS EWD ACROSS CNTRL
KY...WITH A WEAKENING TREND NOTED IN RECENT RADAR REFLECTIVITY
IMAGERY. CONVECTION ALONG THE OH RIVER HAS REINFORCED A SWD MOVING
REMNANT OUTFLOW BOUNDARY DRAPED ACROSS THE REGION. THIS...ALONG WITH
A LESS FAVORABLE THERMODYNAMIC ENVIRONMENT DOWNSHEAR /WITH
INSTABILITY PARAMETERS PROBABLY OVERESTIMATED BY MOST SHORT-TERM
GUIDANCE AS SFC OBS INDICATE DEW POINTS IN THE UPPER 50S/...MAY LEAD
TO A MORE MARGINAL SVR THREAT WITH EWD PROGRESSION. ALTHOUGH AN
ISOLATED THREAT FOR DMGG WINDS AND HAIL MAY STILL EXIST...IT
CURRENTLY APPEARS THAT A NEW WW WILL NOT BE NEEDED...BUT CONVECTIVE
TRENDS WILL CONTINUE TO BE MONITORED. TORNADO WW 186 WILL BE ALLOWED
TO EXPIRE AT 00Z.

..ROGERS.. 04/23/2011

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...JKL...ILN...LMK...

LAT...LON   36828664 38118612 38318517 38418416 38478357 38068329
            37508358 37138509 36828664

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 22, 9:20 PM CDTMesoscale DiscussionSPCAdair, Allen, Anderson, Ballard, Barren, Bath and 80 more55 min
Apr 23, 1:04 AM CDTTornado WatchSPCAdair, Anderson, Ballard, Barren, Boone, Bourbon and 67 more4 hr
Apr 23, 3:41 AM CDTMesoscale DiscussionSPCAnderson, Ballard, Bourbon, Boyle, Breckinridge, Bullitt and 45 more94 min
Apr 23, 4:22 AM CDTMesoscale DiscussionSPCAnderson, Boyle, Breckinridge, Bullitt, Butler, Caldwell and 24 more23 min
Apr 23, 10:51 AM CDTMesoscale DiscussionSPCAnderson, Bath, Boone, Bourbon, Boyd, Bracken and 43 more84 min
Apr 23, 1:04 PM CDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 17 more86 min
Apr 23, 2:30 PM CDTTornado WatchSPCAdair, Allen, Anderson, Barren, Boyle, Breckinridge and 46 more5 hr
Apr 23, 2:56 PM CDTMesoscale DiscussionSPCBath, Bourbon, Boyd, Bracken, Carter, Clark and 14 more64 min
Apr 23, 3:39 PM CDTSevere Thunderstorm WatchSPCBoyd, Carter, Greenup, Lawrence4 hr
Apr 23, 5:09 PM CDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 11 more2 hr
Apr 23, 5:38 PM CDTSevere Thunderstorm WatchSPCBallard, Carlisle, Fulton, Hickman6 hr

Nearby

Mesoscale Discussions in Kentucky, 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.