Alert archive / Tennessee / Mesoscale Discussions in 2003

Mesoscale Discussion 810

May 6, 20034 states

The Storm Prediction Center issued this mesoscale discussion at May 6, 2003, 11:32 PM CDT for 4 states. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued
May 6, 2003, 11:32 PM CDT (04:32 UTC)
Expired
May 7, 2003, 1:00 AM CDT
In force
88 min
Issued by
the Storm Prediction Center
All 85 counties

Jackson County, AL, Limestone County, AL, Madison County, AL, Catoosa County, GA, Dade County, GA, Breckinridge County, KY, Butler County, KY, Caldwell County, KY, Calloway County, KY, Christian County, KY, Daviess County, KY, Edmonson County, KY, Graves County, KY, Grayson County, KY, Hancock County, KY, Hardin County, KY, Hart County, KY, Hickman County, KY, Hopkins County, KY, Logan County, KY, Lyon County, KY, Marshall County, KY, McLean County, KY, Muhlenberg County, KY, Ohio County, KY, Simpson County, KY, Todd County, KY, Trigg County, KY, Warren County, KY, Bedford County, TN, Benton County, TN, Bledsoe County, TN, Cannon County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Coffee County, TN, Crockett County, TN, Davidson County, TN, Decatur County, TN, DeKalb County, TN, Dickson County, TN, Dyer County, TN, Fayette County, TN, Franklin County, TN, Gibson County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lauderdale County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Madison County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Montgomery County, TN, Moore County, TN, Obion County, TN, Perry County, TN, Robertson County, TN, Rutherford County, TN, Sequatchie County, TN, Smith County, TN, Stewart County, TN, Sumner County, TN, Tipton County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, Wayne County, TN, Weakley County, TN, White County, TN, Williamson County, TN, Wilson County, TN

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 4.5 hours before the alert went out and 56 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, Nashville Metro, TN at 00:00Z on 2003-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1519 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, Nashville Metro, TN at 00:00Z on 2003-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 92 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
1519 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
720 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
92 m²/s²
0-3 km storm-relative helicity
120 m²/s²
Significant tornado parameter
0.9
Supercell composite
3.1

Open this sounding in Storm Lab

The text

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

009 
ACUS11 KWNS 070433
SWOMCD
SPC MCD 070432 
TNZ000-GAZ000-KYZ000-ALZ000-INZ000-070600-

MESOSCALE DISCUSSION 0810
NWS STORM PREDICTION CENTER NORMAN OK
1132 PM CDT TUE MAY 06 2003

AREAS AFFECTED...SE MO...SRN IL...SRN IN AND WRN KY

CONCERNING...TORNADO WATCH 275...

VALID 070432Z - 070600Z

NEW WW WILL BE ISSUED SOON.

MESOHIGH/SURFACE COLD POOL CONTINUES TO SURGE SOUTHEASTWARD INTO THE
EVANSVILLE IN/PADACUH KY AREAS AND THE MISSOURI BOOTHEEL.  INTENSE
TORNADIC SUPERCELL NORTHEAST OF THE PADUCAH DURING THE PAST HOUR OR
SO HAS GRADUALLY MERGED INTO ACTIVITY ALONG/ABOVE OUTFLOW BOUNDARY. 
HOWEVER...NEW CELLS ARE DEVELOPING ON NOSE OF LOW-LEVEL THERMAL
RIDGE AHEAD OF COLD POOL...EAST OF PADUCAH.  WHILE HODOGRAPHS WILL
PROVIDE CONTINUING POTENTIAL FOR TORNADOES WITH THESE CELLS...THREAT
MAY BE MITIGATED BY SOMEWHAT COOLER/DRIER AND MORE STABLE BOUNDARY
LAYER ACROSS WEST CENTRAL KENTUCKY.  

MESOSCALE CONVECTIVE SYSTEM WILL GRADUALLY DEVELOP EAST
NORTHEASTWARD WITH STRONGER FORCING FOR UPWARD VERTICAL MOTION...
INTO THE LOUISVILLE AND BOWLING GREEN KY ARES BY THE 08/09Z TIME
FRAME.	OTHERWISE...OLD OUTFLOW BOUNDARY CONTINUES TO LIFT OUT OF
THE NORTHERN GULF STATES INTO THE TENNESSEE VALLEY.  ISOLATED
STRONGER CELLS DEVELOPING ALONG/NORTH OF THIS BOUNDARY WILL POSE
CONTINUING SEVERE RISK ACROSS WESTERN/MIDDLE TENNESSEE.


..KERR.. 05/07/2003

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

ATTN...WFO...MRX...FFC...LMK...OHX...HUN...PAH...MEG...

37438768 37968709 38068644 37528572 36528638 35998528
35008482 34478583 35058795 35098922 35319003 36848891

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 6, 11:50 PM CDTTornado WatchSPCColbert, Lauderdale, Lawrence, Limestone, Madison, Morgan6 hr
May 7, 1:41 AM CDTMesoscale DiscussionSPCColbert, Franklin, Lauderdale, Lawrence, Limestone, Madison and 1 more3 hr
May 7, 4:55 AM CDTTornado WatchSPCLauderdale6 hr
May 7, 7:06 AM CDTMesoscale DiscussionSPCColbert, Cullman, Fayette, Franklin, Jackson, Lamar and 8 more114 min
May 7, 7:35 AM CDTTornado WatchSPCBlount, Colbert, Cullman, Fayette, Franklin, Greene and 16 more5 hr
May 7, 10:24 AM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 20 more2 hr
May 7, 10:35 AM CDTTornado WatchSPCBibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 23 more5 hr
May 7, 10:50 AM CDTTornado WatchSPCSumter5 hr
May 7, 1:42 PM CDTMesoscale DiscussionSPCAutauga, Baldwin, Bullock, Butler, Choctaw, Clarke and 14 more2 hr
May 7, 2:30 PM CDTTornado WatchSPCRussell6 hr
May 7, 3:00 PM CDTTornado WatchSPCAutauga, Barbour, Bibb, Bullock, Butler, Calhoun and 30 more6 hr
May 7, 6:29 PM CDTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Bullock, Butler, Calhoun and 32 more91 min
May 7, 1:16 AM CDTMesoscale DiscussionSPCFannin, Lumpkin, Towns, Union, White3 hr
May 6, 9:35 PM CDTMesoscale DiscussionSPCBallard, Crittenden, Henderson, Livingston, McCracken, Union and 1 more115 min
May 7, 2:40 AM CDTSevere Thunderstorm WatchSPCBell, Breathitt, Clark, Clay, Elliott, Estill and 27 more5 hr
May 7, 4:26 AM CDTMesoscale DiscussionSPCBell, Breathitt, Clark, Clay, Elliott, Estill and 27 more2 hr

Nearby

Mesoscale Discussions in Tennessee, 2003Mesoscale Discussions in Kentucky, 2003Mesoscale Discussions in Alabama, 2003Every mesoscale discussion in 2003

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.