Alert archive / Tennessee / Mesoscale Discussions in 2003
Mesoscale Discussion 810
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.
- 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
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 11:50 PM CDT | Tornado Watch | SPC | Colbert, Lauderdale, Lawrence, Limestone, Madison, Morgan | 6 hr |
| May 7, 1:41 AM CDT | Mesoscale Discussion | SPC | Colbert, Franklin, Lauderdale, Lawrence, Limestone, Madison and 1 more | 3 hr |
| May 7, 4:55 AM CDT | Tornado Watch | SPC | Lauderdale | 6 hr |
| May 7, 7:06 AM CDT | Mesoscale Discussion | SPC | Colbert, Cullman, Fayette, Franklin, Jackson, Lamar and 8 more | 114 min |
| May 7, 7:35 AM CDT | Tornado Watch | SPC | Blount, Colbert, Cullman, Fayette, Franklin, Greene and 16 more | 5 hr |
| May 7, 10:24 AM CDT | Mesoscale Discussion | SPC | Bibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 20 more | 2 hr |
| May 7, 10:35 AM CDT | Tornado Watch | SPC | Bibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 23 more | 5 hr |
| May 7, 10:50 AM CDT | Tornado Watch | SPC | Sumter | 5 hr |
| May 7, 1:42 PM CDT | Mesoscale Discussion | SPC | Autauga, Baldwin, Bullock, Butler, Choctaw, Clarke and 14 more | 2 hr |
| May 7, 2:30 PM CDT | Tornado Watch | SPC | Russell | 6 hr |
| May 7, 3:00 PM CDT | Tornado Watch | SPC | Autauga, Barbour, Bibb, Bullock, Butler, Calhoun and 30 more | 6 hr |
| May 7, 6:29 PM CDT | Mesoscale Discussion | SPC | Autauga, Barbour, Bibb, Bullock, Butler, Calhoun and 32 more | 91 min |
| May 7, 1:16 AM CDT | Mesoscale Discussion | SPC | Fannin, Lumpkin, Towns, Union, White | 3 hr |
| May 6, 9:35 PM CDT | Mesoscale Discussion | SPC | Ballard, Crittenden, Henderson, Livingston, McCracken, Union and 1 more | 115 min |
| May 7, 2:40 AM CDT | Severe Thunderstorm Watch | SPC | Bell, Breathitt, Clark, Clay, Elliott, Estill and 27 more | 5 hr |
| May 7, 4:26 AM CDT | Mesoscale Discussion | SPC | Bell, Breathitt, Clark, Clay, Elliott, Estill and 27 more | 2 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.