Alert archive / Alabama / Mesoscale Discussions in 2012
Mesoscale Discussion 466
The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2012, 6:15 PM CDT for 29 counties in Alabama; Heard County, Georgia. It was in force for 45 min.
The area
The outline as issued.
The facts
- Issued
- Apr 5, 2012, 6:15 PM CDT (23:15 UTC)
- Expired
- Apr 5, 2012, 7:00 PM CDT
- In force
- 45 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch likely
All 30 counties
Autauga County, AL, Bibb County, AL, Blount County, AL, Bullock County, AL, Calhoun County, AL, Chambers 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, Elmore County, AL, Etowah County, AL, Jefferson County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marshall County, AL, Montgomery County, AL, Morgan County, AL, Randolph County, AL, Russell County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tallapoosa County, AL, Heard County, GA
The radar
The Birmingham radar (KBMX), 71 km from the middle of the area, began a volume at 23:14 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
Birmingham, AL (KBMX), launched 12:00Z, 11.3 hours before the alert went out and 72 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
- 315 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 754 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- -91 m²/s²
- 0-3 km storm-relative helicity
- -43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -1.5
The text
As transmitted, in the capitals the NWS used until 2016.
713
ACUS11 KWNS 052315
SWOMCD
SPC MCD 052315 COR
GAZ000-ALZ000-060000-
MESOSCALE DISCUSSION 0466
NWS STORM PREDICTION CENTER NORMAN OK
0615 PM CDT THU APR 05 2012
AREAS AFFECTED...CNTRL AND ERN AL...FAR WRN GA
CONCERNING...SEVERE POTENTIAL...WATCH LIKELY
VALID 052315Z - 060000Z
CORRECTED TO UPDATE GRAPHIC
AN ISOLATED WIND DAMAGE AND LARGE HAIL THREAT SHOULD EXIST AS STORMS
MOVE EWD ACROSS ECNTRL AL OVER THE NEXT COUPLE HOURS. WW ISSUANCE IS
BEING CONSIDERED ACROSS THE REGION.
THUNDERSTORMS ARE INCREASING IN COVERAGE ACROSS WCNTRL AL ALONG A
NARROW AXIS OF MODERATE INSTABILITY WHERE SBCAPE IS ESTIMATED TO BE
AROUND 1000 J/KG. THIS COMBINED WITH 50 KT OF DEEP LAYER SHEAR
EVIDENT ON THE BIRMINGHAM AL WSR-88D VWP SHOULD SUPPORT A SUPERCELL
THREAT EARLY THIS EVENING. ISOLATED LARGE HAIL WILL BE POSSIBLE. IF
THE STORMS CAN DEVELOP INTO A LINE...THEN A WIND DAMAGE THREAT MAY
ALSO DEVELOP ACROSS THE REGION.
..BROYLES.. 04/05/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FFC...BMX...HUN...MOB...
LAT...LON 34318533 34738583 34598692 33788725 32208719 31818636
32058521 32578496 34318533SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 5, 7:36 AM CDT | Mesoscale Discussion | SPC | Choctaw, Greene, Hale, Marengo, Perry, Pickens and 2 more | 54 min |
| Apr 5, 9:14 AM CDT | Severe Thunderstorm Watch | SPC | Autauga, Barbour, Bibb, Bullock, Butler, Chambers and 34 more | 8 hr |
| Apr 5, 10:41 AM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Butler, Chilton, Choctaw, Clarke and 15 more | 94 min |
| Apr 5, 12:09 PM CDT | Mesoscale Discussion | SPC | Colbert, Cullman, Franklin, Lauderdale, Lawrence, Limestone and 4 more | 96 min |
| Apr 5, 1:12 PM CDT | Mesoscale Discussion | SPC | Barbour, Bullock, Chambers, Clay, Coffee, Covington and 11 more | 93 min |
| Apr 5, 1:21 PM CDT | Severe Thunderstorm Watch | SPC | Colbert, DeKalb, Franklin, Jackson, Lauderdale, Lawrence and 4 more | 8 hr |
| Apr 5, 1:58 PM CDT | Severe Thunderstorm Watch | SPC | Coffee, Dale, Geneva, Henry, Houston | 6 hr |
| Apr 5, 3:06 PM CDT | Mesoscale Discussion | SPC | Colbert, DeKalb, Franklin, Jackson, Lauderdale, Lawrence and 4 more | 54 min |
| Apr 5, 3:46 PM CDT | Mesoscale Discussion | SPC | Blount, Calhoun, Cullman, Etowah, Fayette, Jefferson and 7 more | 59 min |
| Apr 5, 3:49 PM CDT | Mesoscale Discussion | SPC | Geneva, Henry, Houston | 86 min |
| Apr 5, 6:14 PM CDT | Severe Thunderstorm Watch | SPC | Autauga, Bibb, Blount, Bullock, Calhoun, Chambers and 21 more | 3 hr |
| Apr 5, 12:03 PM CDT | Mesoscale Discussion | SPC | Banks, Burke, Clarke, Columbia, Effingham, Elbert and 24 more | 87 min |
| Apr 5, 12:47 PM CDT | Severe Thunderstorm Watch | SPC | Bryan, Bulloch, Burke, Candler, Chatham, Columbia and 17 more | 7 hr |
| Apr 5, 12:54 PM CDT | Mesoscale Discussion | SPC | Bartow, Catoosa, Chattooga, Cherokee, Dade, Dawson and 11 more | 96 min |
| Apr 5, 2:37 PM CDT | Mesoscale Discussion | SPC | Burke, Chatham, Columbia, Effingham, Elbert, Franklin and 11 more | 53 min |
| Apr 5, 5:35 PM CDT | Mesoscale Discussion | SPC | Bryan, Bulloch, Burke, Candler, Chatham, Columbia and 12 more | 85 min |
Nearby
Mesoscale Discussions in Alabama, 2012Mesoscale Discussions in Georgia, 2012Every mesoscale discussion in 2012
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.