Alert archive / Alabama / Mesoscale Discussions in 2003
Mesoscale Discussion 428
The Storm Prediction Center issued this mesoscale discussion at Apr 7, 2003, 4:49 AM CDT for 17 counties in Alabama; 5 counties in Georgia; Kemper County, Lauderdale County, Newton County, Mississippi. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 7, 2003, 4:49 AM CDT (09:49 UTC)
- Expired
- Apr 7, 2003, 7:45 AM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
All 25 counties
Autauga County, AL, Chambers County, AL, Chilton County, AL, Coosa County, AL, Dallas County, AL, Elmore County, AL, Greene County, AL, Hale County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Montgomery County, AL, Perry County, AL, Russell County, AL, Sumter County, AL, Tallapoosa County, AL, Harris County, GA, Meriwether County, GA, Muscogee County, GA, Talbot County, GA, Troup County, GA, Kemper County, MS, Lauderdale County, MS, Newton County, MS
The radar
The Birmingham radar (KBMX), 73 km from the middle of the area, began a volume at 09:53 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 nearest sounding before it
Birmingham, AL (KBMX), launched 00:00Z, 9.8 hours before the alert went out and 73 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
- 677 J/kg
- Mixed-layer CIN
- -71 J/kg
- Mixed-layer LCL
- 1007 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 133 m²/s²
- 0-3 km storm-relative helicity
- 175 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.4
The text
As transmitted, in the capitals the NWS used until 2016.
375 ACUS11 KWNS 070950 SWOMCD SPC MCD 070949 GAZ000-ALZ000-MSZ000-071245- MESOSCALE DISCUSSION 0428 NWS STORM PREDICTION CENTER NORMAN OK 0449 AM CDT MON APR 07 2003 AREAS AFFECTED...CNTRL MS...CNTRL AL...W CNTRL GA CONCERNING...SEVERE THUNDERSTORM POTENTIAL...HEAVY RAINFALL 110... VALID 070949Z - 071245Z HEAVY RAIN WILL PERSIST FROM PARTS OF CENTRAL MISSISSIPPI INTO WEST CENTRAL GEORGIA THIS MORNING...WITH LOCALLY EXCESSIVE RAIN TOTALS LIKELY. STRONGER MID/UPPER FORCING FOR UPWARD VERTICAL MOTION IS NOW SHIFTING FROM THE TENNESSEE VALLEY INTO THE CENTRAL APPALACHIANS. HOWEVER...BELT OF CONFLUENT LOW/MID-LEVEL FLOW IN ITS WAKE ACROSS CENTRAL MISSISSIPPI/ALABAMA REMAINS FOCUS FOR VIGOROUS CONVECTIVE DEVELOPMENT...SUPPORTING LIFT OF MOIST AND MODERATELY UNSTABLE AIR. CAPE FOR PARCELS LIFTED FROM JUST ABOVE SHALLOW NEUTRAL TO STABLE SURFACE-BASED LAYER APPEARS TO BE ON THE ORDER OF 1000 TO 1500 J/KG...IN KINEMATIC ENVIRONMENT SUPPORTIVE OF SUPERCELLS. DAMAGING WIND GUSTS/ISOLATED LARGE HAIL WILL REMAIN POSSIBLE IN MOST INTENSE CELLS...BUT EXCESSIVE RAIN LIKELY HAS BECOME PRIMARY THREAT AS CONVECTION CONTINUES TO TRAIN ALONG/JUST NORTH OF A JACKSON/MERIDIAN/MONTGOMERY LINE. MODELS SUGGEST STRONGEST LOW-LEVEL FORCING WILL BEGIN TO SHIFT EASTWARD OUT OF CENTRAL MISSISSIPPI BY 12Z...BUT HEAVY RAIN THREAT MAY PERSIST ACROSS CENTRAL ALABAMA...WEST THROUGH NORTH OF MONTGOMERY...INTO AREAS OF WEST CENTRAL GEORGIA...SOUTHWEST OF ATLANTA...THROUGH THE 15-18Z TIME FRAME. ..KERR.. 04/07/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FFC...BMX...MOB...JAN... 32208994 32718886 32898811 32878741 33008649 33248565 33248474 33148457 32658443 32488460 32288510 32228579 32138645 32098700 32008785 32048848 32158909
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 6, 8:13 PM CDT | Mesoscale Discussion | SPC | Bibb, Chilton, Choctaw, Dallas, Fayette, Greene and 8 more | 2 hr |
| Apr 6, 9:48 PM CDT | Mesoscale Discussion | SPC | Autauga, Chilton, Choctaw, Clarke, Dallas, Hale and 6 more | 87 min |
| Apr 6, 10:15 PM CDT | Tornado Watch | SPC | Autauga, Butler, Choctaw, Clarke, Conecuh, Covington and 10 more | 5 hr |
| Apr 6, 11:39 PM CDT | Mesoscale Discussion | SPC | Autauga, Butler, Choctaw, Clarke, Conecuh, Covington and 11 more | 2 hr |
| Apr 7, 1:51 AM CDT | Mesoscale Discussion | SPC | Bullock, Butler, Lowndes, Macon, Montgomery | 54 min |
| Apr 7, 2:55 AM CDT | Tornado Watch | SPC | Autauga, Barbour, Bullock, Chilton, Choctaw, Dallas and 13 more | 4 hr |
| Apr 7, 9:11 AM CDT | Mesoscale Discussion | SPC | Barbour, Coffee, Conecuh, Covington, Crenshaw, Dale and 6 more | 3 hr |
| Apr 7, 9:40 AM CDT | Tornado Watch | SPC | Barbour, Bullock, Macon, Pike, Russell | 5 hr |
| Apr 7, 11:25 AM CDT | Mesoscale Discussion | SPC | Baldwin, Butler, Clarke, Coffee, Conecuh, Covington and 6 more | 3 hr |
| Apr 7, 12:07 PM CDT | Mesoscale Discussion | SPC | Baldwin, Butler, Clarke, Coffee, Conecuh, Covington and 6 more | 113 min |
| Apr 7, 12:22 PM CDT | Mesoscale Discussion | SPC | Baldwin, Butler, Clarke, Coffee, Conecuh, Covington and 6 more | 113 min |
| Apr 7, 3:40 PM CDT | Severe Thunderstorm Watch | SPC | Baldwin, Covington, Escambia, Mobile | 5 hr |
| Apr 7, 5:58 PM CDT | Mesoscale Discussion | SPC | Baldwin, Escambia, Mobile | 2 hr |
| Apr 7, 10:05 AM CDT | Severe Thunderstorm Watch | SPC | Amite, Forrest, George, Greene, Hancock, Harrison and 11 more | 6 hr |
| Apr 7, 11:02 AM CDT | Mesoscale Discussion | SPC | Forrest, Lamar, Pearl River, Perry, Stone | 3 hr |
| Apr 7, 2:13 PM CDT | Mesoscale Discussion | SPC | Hancock, Harrison, Pearl River, Perry, Stone | 3 hr |
| Apr 7, 2:36 PM CDT | Mesoscale Discussion | SPC | Hancock, Harrison, Pearl River, Perry, Stone | 114 min |
Nearby
Mesoscale Discussions in Alabama, 2003Mesoscale Discussions in Georgia, 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.