Alert archive / Alabama / Severe Thunderstorm Watches in 2003
Severe Thunderstorm Watch 511
The Storm Prediction Center issued this severe thunderstorm watch at Jun 11, 2003, 11:50 AM CDT for 29 counties in Alabama; 9 counties in Georgia. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 11, 2003, 11:50 AM CDT (16:50 UTC)
- Expired
- Jun 11, 2003, 4:00 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
All 38 counties
Autauga County, AL, Bibb County, AL, Blount County, AL, Calhoun County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Cullman County, AL, Dallas County, AL, DeKalb County, AL, Etowah County, AL, Greene County, AL, Hale County, AL, Jackson County, AL, Jefferson County, AL, Lowndes County, AL, Madison County, AL, Marengo County, AL, Marshall County, AL, Morgan County, AL, Perry County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Floyd County, GA, Gordon County, GA, Murray County, GA, Polk County, GA, Walker County, GA, Whitfield County, GA
The radar
The Birmingham radar (KBMX), 27 km from the middle of the area, began a volume at 16:49 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.
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 12:01 PM CDT | Severe Thunderstorm Warning | HUN | Marshall | 29 min |
| Jun 11, 2:20 PM CDT | Severe Thunderstorm Warning | HUN | Limestone, Morgan | 40 min |
| Jun 11, 2:21 PM CDT | Severe Thunderstorm Warning | BMX | Walker | 39 min |
| Jun 11, 2:31 PM CDT | Severe Thunderstorm Warning | BMX | Jefferson, Shelby | 59 min |
| Jun 11, 2:52 PM CDT | Severe Thunderstorm Warning | HUN | Cullman, Madison | 38 min |
| Jun 11, 2:57 PM CDT | Severe Thunderstorm Warning | HUN | Limestone, Morgan | 48 min |
| Jun 11, 2:59 PM CDT | Severe Thunderstorm Warning | BMX | St. Clair, Talladega | 46 min |
| Jun 11, 3:15 PM CDT | Severe Thunderstorm Warning | BMX | Blount | 60 min |
| Jun 11, 3:17 PM CDT | Severe Thunderstorm Warning | HUN | Marshall | 58 min |
| Jun 11, 3:44 PM CDT | Severe Thunderstorm Warning | BMX | Etowah | 46 min |
| Jun 11, 3:48 PM CDT | Severe Thunderstorm Warning | BMX | St. Clair | 12 min |
| Jun 11, 3:54 PM CDT | Severe Thunderstorm Warning | HUN | DeKalb | 36 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Birmingham, AL (KBMX), launched 12:00Z, 4.8 hours before the alert went out and 26 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
- 2567 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 545 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 111651
SEL1
SPC WW 111650
ALZ000-GAZ000-112100-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 511
NWS STORM PREDICTION CENTER NORMAN OK
1150 AM CDT WED JUN 11 2003
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
CENTRAL AND NORTHEAST ALABAMA
NORTHWEST GEORGIA
EFFECTIVE THIS WEDNESDAY MORNING AND AFTERNOON FROM 1150 AM UNTIL
400 PM CDT.
HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 65 STATUTE MILES
EAST AND WEST OF A LINE FROM 40 MILES WEST SOUTHWEST OF SELMA
ALABAMA TO 55 MILES NORTH NORTHWEST OF ROME GEORGIA.
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.
OTHER WATCH INFORMATION...CONTINUE...WW 509...WW 510...
DISCUSSION...ACTIVITY INCREASING OVER SERN MS APPEARS TO BE
ORGANIZING INTO A MORE LINEAR MODE AS COLD POOL BECOMES ESTABLISHED.
THIS MAY SUPPORT A MORE ORGANIZED MCS...WITH ATTENDANT THREAT OF
LARGE HAIL AND DAMAGING WINDS...AS IT SHIFTS ENEWD INTO CENTRAL AL
DURING THE NEXT FEW HOURS. IN ADDITION...A VERY UNSTABLE AND WEAKLY
CAPPED AIR MASS ACROSS THE REGION SUGGESTS SEVERE THUNDERSTORMS WILL
LIKELY OVERSPREAD MUCH OF THE AREA THIS AFTERNOON.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 24035.
...EVANS
320,0884 350,0864 350,0842 320,0863SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 9:21 AM CDT | Mesoscale Discussion | SPC | Colbert, Fayette, Franklin, Lamar, Lauderdale, Marion and 1 more | 54 min |
| Jun 11, 10:33 AM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Bullock, Butler, Chilton, Choctaw and 25 more | 87 min |
| Jun 11, 10:45 AM CDT | Severe Thunderstorm Watch | SPC | Colbert, Fayette, Franklin, Lamar, Lauderdale, Lawrence and 4 more | 5 hr |
| Jun 11, 12:26 PM CDT | Mesoscale Discussion | SPC | Colbert, Fayette, Franklin, Lamar, Lauderdale, Lawrence and 4 more | 64 min |
| Jun 11, 3:01 PM CDT | Mesoscale Discussion | SPC | Colbert, Fayette, Franklin, Lamar, Lauderdale, Lawrence and 3 more | 29 min |
| Jun 11, 3:25 PM CDT | Severe Thunderstorm Watch | SPC | Blount, Cherokee, Cullman, DeKalb, Etowah, Jackson and 6 more | 5 hr |
| Jun 11, 3:30 PM CDT | Severe Thunderstorm Watch | SPC | Colbert, Franklin, Lamar, Lauderdale, Marion | 5 hr |
| Jun 11, 4:57 PM CDT | Mesoscale Discussion | SPC | Blount, Cherokee, Colbert, Cullman, DeKalb, Etowah and 11 more | 93 min |
Nearby
Severe Thunderstorm Watches in Alabama, 2003Severe Thunderstorm Watches in Georgia, 2003Every severe thunderstorm watch 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.