Alert archive / Kentucky / Mesoscale Discussions in 2004

Mesoscale Discussion 920

May 26, 20044 states

The Storm Prediction Center issued this mesoscale discussion at May 26, 2004, 5:27 PM CDT for 4 states. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
May 26, 2004, 5:27 PM CDT (22:27 UTC)
Expired
May 26, 2004, 7:00 PM CDT
In force
93 min
Issued by
the Storm Prediction Center
All 75 counties

Adair County, KY, Allen County, KY, Barren County, KY, Bell County, KY, Butler County, KY, Caldwell County, KY, Casey County, KY, Christian County, KY, Clinton County, KY, Cumberland County, KY, Daviess County, KY, Edmonson County, KY, Grayson County, KY, Green County, KY, Harlan County, KY, Hart County, KY, Henderson County, KY, Hopkins County, KY, Knox County, KY, Laurel County, KY, Logan County, KY, McCreary County, KY, McLean County, KY, Metcalfe County, KY, Monroe County, KY, Muhlenberg County, KY, Ohio County, KY, Pulaski County, KY, Russell County, KY, Simpson County, KY, Taylor County, KY, Todd County, KY, Trigg County, KY, Warren County, KY, Wayne County, KY, Webster County, KY, Whitley County, KY, Avery County, NC, Burke County, NC, Madison County, NC, McDowell County, NC, Mitchell County, NC, Watauga County, NC, Yancey County, NC, Anderson County, TN, Campbell County, TN, Carter County, TN, Claiborne County, TN, Clay County, TN, Cocke County, TN, Fentress County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN, Jackson County, TN, Jefferson County, TN, Johnson County, TN, Knox County, TN, Macon County, TN, Morgan County, TN, Overton County, TN, Pickett County, TN, Scott County, TN, Sullivan County, TN, Sumner County, TN, Unicoi County, TN, Union County, TN, Washington County, TN, City of Bristol, VA, City of Norton, VA, Lee County, VA, Scott County, VA, Washington County, VA

The radar

The Nashville radar (KOHX), 115 km from the middle of the area, began a volume at 22:31 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, 10.5 hours before the alert went out and 331 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 2004-05-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 318 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 2004-05-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 square meters per square second.1939587897117136Sfc1 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
318 J/kg
Mixed-layer CIN
-97 J/kg
Mixed-layer LCL
632 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
112 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

431 
ACUS11 KWNS 262227
SWOMCD
SPC MCD 262227 
VAZ000-NCZ000-TNZ000-KYZ000-INZ000-270000-

MESOSCALE DISCUSSION 0920
NWS STORM PREDICTION CENTER NORMAN OK
0527 PM CDT WED MAY 26 2004

AREAS AFFECTED...SRN KY...NERN TN...EXTREME SWRN VA AND NWRN NC

CONCERNING...SEVERE THUNDERSTORM WATCH 296...

VALID 262227Z - 270000Z

LEADING EDGE OF CNTRL APPALACHIAN MCS CONTINUES TO MOVE INTO PARTS
OF SWRN VA AND NWRN NC WITH TRAILING OUTFLOW EXTENDING NWWD ACROSS
NRN TN INTO SWRN KY.  COLD POOL IS GRADUALLY SHIFTING SWD...BUT HAS
BECOME STATIONARY ACROSS SWRN KY DUE TO INFLUENCE OF AN UPSTREAM
SHORTWAVE TROUGH.

TSTMS WILL CONTINUE TO MOVE ESEWD ALONG THE LEADING EDGE OF THE
OUTFLOW ACROSS SRN PARTS OF WW 296.  VERTICAL SHEAR IS SUFFICIENT
FOR SUPERCELLS AND TSTMS THAT DEVELOP JUST AHEAD OF THE OUTFLOW MAY
BRIEFLY PRODUCE TORNADOES.  VWPS SHOW SUFFICIENT SPEED SHEAR IN THE
LOWEST LAYERS TO SUPPORT BRIEF SPIN-UPS WITH THE TSTMS THAT DEVELOP
IN THE WARM SECTOR.  OTHERWISE...DAMAGING WINDS AND LARGE HAIL WILL
BE THE PRIMARY THREATS FOR THE NEXT COUPLE OF HOURS.

IN WW 296...THE SEVERE THREAT HAS DIMINISHED ACROSS THE NERN PARTS
OF THE WW IN SERN KY/SWRN VA.  HOWEVER...GIVEN THAT TSTMS MAY
REGENERATE UPSTREAM ACROSS THE LOWER OH VLY IN ADVANCE OF UPSTREAM
TROUGH...WILL MAINTAIN WW ACROSS THE WRN PORTIONS.

..RACY.. 05/26/2004

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

ATTN...WFO...RNK...GSP...MRX...JKL...LMK...OHX...PAH...

36748803 37918786 36748156 35578166

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 25, 7:28 PM CDTMesoscale DiscussionSPCAnderson, Bath, Boone, Bourbon, Boyle, Bracken and 61 more92 min
May 26, 8:50 AM CDTSevere Thunderstorm WatchSPCBreckinridge, Daviess, Hancock, Henderson, McLean, Meade and 3 more5 hr
May 26, 10:50 AM CDTMesoscale DiscussionSPCAdair, Allen, Anderson, Ballard, Barren, Bath and 90 more85 min
May 26, 11:25 AM CDTSevere Thunderstorm WatchSPCAdair, Allen, Anderson, Barren, Bath, Boone and 83 more7 hr
May 26, 12:38 PM CDTMesoscale DiscussionSPCBell, Floyd, Harlan, Johnson, Knott, Knox and 5 more97 min
May 26, 1:10 PM CDTTornado WatchSPCBallard, Carlisle, Fulton, Hickman, McCracken8 hr
May 26, 1:18 PM CDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Boone and 83 more87 min
May 26, 1:50 PM CDTSevere Thunderstorm WatchSPCBell, Boyd, Breathitt, Clay, Elliott, Floyd and 18 more7 hr
May 26, 3:25 PM CDTSevere Thunderstorm WatchSPCAdair, Allen, Barren, Bell, Butler, Caldwell and 37 more6 hr
May 26, 3:32 PM CDTMesoscale DiscussionSPCBallard, Carlisle, Fulton, Hickman, McCracken88 min
May 26, 5:57 PM CDTMesoscale DiscussionSPCBallard, Carlisle, Fulton, Hickman93 min
May 26, 2:50 PM CDTMesoscale DiscussionSPCAshe, Avery, Watauga85 min
May 26, 4:45 PM CDTSevere Thunderstorm WatchSPCCaswell, Granville, Person, Rockingham, Stokes, Surry and 2 more5 hr
May 26, 4:57 PM CDTMesoscale DiscussionSPCAlamance, Alexander, Anson, Cabarrus, Catawba, Chatham and 27 more63 min
May 26, 5:55 PM CDTSevere Thunderstorm WatchSPCAlamance, Alexander, Avery, Buncombe, Burke, Cabarrus and 37 more5 hr
May 25, 8:50 PM CDTMesoscale DiscussionSPCAccomack, Essex, King and Queen, Lancaster, Northumberland, Richmond and 1 more55 min

Nearby

Mesoscale Discussions in Kentucky, 2004Mesoscale Discussions in Tennessee, 2004Mesoscale Discussions in North Carolina, 2004Every mesoscale discussion in 2004

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.