Alert archive / Mississippi / Mesoscale Discussions in 2003
Mesoscale Discussion 938
The Storm Prediction Center issued this mesoscale discussion at May 11, 2003, 3:10 AM CDT for 4 states. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- May 11, 2003, 3:10 AM CDT (08:10 UTC)
- Expired
- May 11, 2003, 4:45 AM CDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
All 72 counties
Bibb County, AL, Blount County, AL, Cullman County, AL, DeKalb County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jackson County, AL, Jefferson County, AL, Lamar County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Pickens County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Dade County, GA, Attala County, MS, Bolivar County, MS, Carroll County, MS, Choctaw County, MS, Clay County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Kemper County, MS, Leake County, MS, Leflore County, MS, Lowndes County, MS, Madison County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Noxubee County, MS, Oktibbeha County, MS, Sharkey County, MS, Sunflower County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yazoo County, MS, Bedford County, TN, Bledsoe County, TN, Cannon County, TN, Clay County, TN, Coffee County, TN, Cumberland County, TN, DeKalb County, TN, Fentress County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Jackson County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, Moore County, TN, Overton County, TN, Putnam County, TN, Rutherford County, TN, Sequatchie County, TN, Smith County, TN, Van Buren County, TN, Warren County, TN, White 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
Birmingham, AL (KBMX), launched 00:00Z, 8.2 hours before the alert went out and 143 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
- 1419 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 1365 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 112 m²/s²
- 0-3 km storm-relative helicity
- 166 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 6.7
The text
As transmitted, in the capitals the NWS used until 2016.
426 ACUS11 KWNS 110811 SWOMCD SPC MCD 110810 TNZ000-GAZ000-KYZ000-ALZ000-MSZ000-ARZ000-LAZ000-110945- MESOSCALE DISCUSSION 0938 NWS STORM PREDICTION CENTER NORMAN OK 0310 AM CDT SUN MAY 11 2003 AREAS AFFECTED...CNTRL TN/NRN AL/NRN AND CNTRL MS CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 110810Z - 110945Z DAMAGING WIND AND ISOLATED LARGE HAIL THREAT IS EXPECTED TO MOVE E AND S OF WW0353 WITHIN THE HOUR. NEW WW/S WILL BE REQUIRED. MEMPHIS/NASHVILLE TN RADAR DATA INDICATE A STRONG TO SEVERE LINE OF TSTMS EXTENDING FROM JUST NW OF BNA TO 40NW OF MSL TO 20 S OF UOX MOVING ESEWD AT 35-40KTS. THE AIRMASS AHEAD OF THIS CONVECTION REMAINS MODERATELY UNSTABLE WITH MLCAPES OF 1000-2000 J/KG. STRONG CONVERGENCE ALONG ESTABLISHED COLD POOL ASSOCIATED WITH ONGOING CONVECTION WILL CONTINUE TO SUPPORT DOWNSTREAM DEVELOPMENT E AND S OF WW0353. STRONG UNIDIRECTIONAL SHEAR PROFILES REMAIN EVIDENT IN COLUMBUS MS AND NASHVILLE TN VWP DATA...FAVORING A THREAT OF DAMAGING WINDS ESPECIALLY WITH BOWS EMBEDDED IN THE CONVECTIVE LINE. ..MEAD.. 05/11/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MRX...FFC...LMK...OHX...BMX...HUN...MEG...JAN...LZK... 34788751 35868650 36648568 36348453 35258516 34238598 33378637 32728724 32498894 32589032 32819108 33919109 33908840 34238799
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 11:20 PM CDT | Tornado Watch | SPC | Colbert, Franklin, Lauderdale | 6 hr |
| May 11, 1:46 AM CDT | Mesoscale Discussion | SPC | Colbert, Lauderdale | 89 min |
| May 11, 3:20 AM CDT | Severe Thunderstorm Watch | SPC | Blount, Cullman, Fayette, Jackson, Jefferson, Lamar and 8 more | 5 hr |
| May 11, 5:22 AM CDT | Mesoscale Discussion | SPC | Blount, Cullman, Fayette, Jackson, Jefferson, Lamar and 8 more | 83 min |
| May 11, 12:20 PM CDT | Mesoscale Discussion | SPC | Baldwin, Barbour, Bullock, Butler, Clarke, Coffee and 18 more | 115 min |
| May 11, 1:15 PM CDT | Severe Thunderstorm Watch | SPC | Autauga, Barbour, Bullock, Butler, Chambers, Chilton and 20 more | 6 hr |
| May 11, 3:00 PM CDT | Mesoscale Discussion | SPC | Autauga, Barbour, Bullock, Butler, Choctaw, Clarke and 14 more | 2 hr |
| May 10, 10:04 PM CDT | Mesoscale Discussion | SPC | Alcorn, Benton, Marshall, Panola, Tippah | 116 min |
| May 10, 7:06 PM CDT | Mesoscale Discussion | SPC | Carroll, Crockett, Dyer, Gibson, Haywood, Henry and 5 more | 54 min |
| May 10, 8:45 PM CDT | Tornado Watch | SPC | Dyer, Lake, Lauderdale, Obion, Shelby, Tipton | 5 hr |
| May 11, 5:55 AM CDT | Severe Thunderstorm Watch | SPC | Anderson, Blount, Bradley, Carter, Claiborne, Cocke and 19 more | 5 hr |
Nearby
Mesoscale Discussions in Mississippi, 2003Mesoscale Discussions in Tennessee, 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.