Alert archive / Georgia / Mesoscale Discussions in 2003
Mesoscale Discussion 944
The Storm Prediction Center issued this mesoscale discussion at May 11, 2003, 12:20 PM CDT for 5 states. It was in force for 115 min.
The area
The outline as issued.
The facts
- Issued
- May 11, 2003, 12:20 PM CDT (17:20 UTC)
- Expired
- May 11, 2003, 2:15 PM CDT
- In force
- 115 min
- Issued by
- the Storm Prediction Center
All 91 counties
Baldwin County, AL, Barbour County, AL, Bullock County, AL, Butler County, AL, Clarke County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Mobile County, AL, Monroe County, AL, Montgomery County, AL, Pike County, AL, Russell County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Santa Rosa County, FL, Appling County, GA, Baker County, GA, Ben Hill County, GA, Bibb County, GA, Bleckley County, GA, Calhoun County, GA, Chattahoochee County, GA, Clay County, GA, Crawford County, GA, Crisp County, GA, Dodge County, GA, Dooly County, GA, Dougherty County, GA, Early County, GA, Harris County, GA, Houston County, GA, Irwin County, GA, Jeff Davis County, GA, Lamar County, GA, Laurens County, GA, Lee County, GA, Macon County, GA, Marion County, GA, Monroe County, GA, Montgomery County, GA, Muscogee County, GA, Peach County, GA, Pulaski County, GA, Quitman County, GA, Randolph County, GA, Schley County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taylor County, GA, Telfair County, GA, Terrell County, GA, Turner County, GA, Twiggs County, GA, Upson County, GA, Webster County, GA, Wheeler County, GA, Wilcox County, GA, Worth County, GA, Ascension Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Saint Bernard Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Lamar County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS
The radar
The Mobile radar (KMOB), 85 km from the middle of the area, began a volume at 17:23 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
Slidell Radar S, LA (KSIL), launched 12:00Z, 5.3 hours before the alert went out and 232 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
- 1481 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 606 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 88 m²/s²
- 0-3 km storm-relative helicity
- 188 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.9
The text
As transmitted, in the capitals the NWS used until 2016.
865 ACUS11 KWNS 111721 SWOMCD SPC MCD 111720 GAZ000-ALZ000-FLZ000-MSZ000-LAZ000-111915- MESOSCALE DISCUSSION 0944 NWS STORM PREDICTION CENTER NORMAN OK 1220 PM CDT SUN MAY 11 2003 AREAS AFFECTED...SERN LA....SRN MS...SRN AND CENTRAL AL/GA...FAR NWRN FL CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 111720Z - 111915Z LARGE SCALE FORCING HAS INCREASED OVER THE AREA AHEAD OF ADVANCING SHORTWAVE TROUGH MOVING OUT OF TX PER WV IMAGERY. A SUBTLE UPPER LEVEL SPEED MAX APPEARS TO BE MOVING ACROSS LA AHEAD OF THE TROUGH AND HAS AIDED IN CONVECTIVE DEVELOPMENT OVER CENTRAL LA. AN OUTFLOW BOUNDARY EXTENDING FROM 30 S OF MEI ENEWD TO 40 S OF FFC AS OF 17Z. EXPECT ADDITIONAL STRONG TO SEVERE CONVECTIVE DEVELOPMENT ALONG THIS BOUNDARY OVER THE NEXT FEW HOURS...AS INHIBITION IS WEAKENING. 35 TO 40 KTS OF SFC-6 KM SHEAR ALONG WITH MODERATE INSTABILITY /2000 J/KG OF MLCAPE/ WILL FAVOR THE POTENTIAL FOR LARGE HAIL. IF ADDITIONAL EARLY MORNING ELEVATED CONVECTION CAN ACCELERATE AND MOVE INTO THE WARM SECTOR A DAMAGING WIND THREAT WILL INCREASE..ESPECIALLY OVER ERN AL INTO CENTRAL GA. A WW MAY BE NEEDED FOR THIS AREA IN THE NEXT HOUR. ..CROSBIE.. 05/11/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...CHS...JAX...FFC...TAE...BMX...MOB...JAN...LIX... 29738959 30329134 31249017 33258385 31778202 31058552
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, 3:10 AM CDT | Mesoscale Discussion | SPC | Bibb, Blount, Cullman, DeKalb, Fayette, Greene and 17 more | 95 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, 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 |
Nearby
Mesoscale Discussions in Georgia, 2003Mesoscale Discussions in Alabama, 2003Mesoscale Discussions in Mississippi, 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; radar from the NEXRAD Level II archive.