Alert archive / Alabama / Mesoscale Discussions in 2012
Mesoscale Discussion 1751
The Storm Prediction Center issued this mesoscale discussion at Aug 13, 2012, 12:21 PM CDT for 28 counties in Alabama; 4 counties in Tennessee. It was in force for 24 min.
The area
The outline as issued.
The facts
- Issued
- Aug 13, 2012, 12:21 PM CDT (17:21 UTC)
- Expired
- Aug 13, 2012, 12:45 PM CDT
- In force
- 24 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 95%
All 32 counties
Autauga County, AL, Bibb County, AL, Blount County, AL, Calhoun County, AL, Cherokee County, AL, Chilton County, AL, Coosa County, AL, Cullman County, AL, Dallas County, AL, DeKalb County, AL, Etowah County, AL, Hale County, AL, Jackson County, AL, Jefferson County, AL, Lawrence County, AL, Limestone 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, Winston County, AL, Franklin County, TN, Grundy County, TN, Lincoln County, TN, Moore County, TN
The radar
The Birmingham radar (KBMX), 65 km from the middle of the area, began a volume at 17:21 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, 5.4 hours before the alert went out and 64 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1302 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 100 m²/s²
- 0-3 km storm-relative helicity
- 115 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 12:38 PM CDT | Severe Thunderstorm Watch | SPC | Bibb, Blount, Calhoun, Cherokee, Chilton, Choctaw and 21 more | 4 hr |
| Aug 13, 3:49 PM CDT | Mesoscale Discussion | SPC | Cleburne | 56 min |
| Aug 13, 3:15 PM CDT | Mesoscale Discussion | SPC | Carroll, Crockett, Dyer, Fayette, Gibson, Hardeman and 9 more | 30 min |
| Aug 13, 3:32 PM CDT | Severe Thunderstorm Watch | SPC | Carroll, Chester, Crockett, Dyer, Fayette, Gibson and 12 more | 7 hr |
| Aug 13, 5:14 PM CDT | Mesoscale Discussion | SPC | Fayette | 91 min |
Nearby
Mesoscale Discussions in Alabama, 2012Mesoscale Discussions in Tennessee, 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.