Alert archive / Alabama / Mesoscale Discussions in 2011
Mesoscale Discussion 1847
The Storm Prediction Center issued this mesoscale discussion at Aug 3, 2011, 10:52 PM CDT for 29 counties in Alabama. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- Aug 3, 2011, 10:52 PM CDT (03:52 UTC)
- Expired
- Aug 4, 2011, 12:15 AM CDT
- In force
- 83 min
- Issued by
- the Storm Prediction Center
All 29 counties
Bibb County, AL, Blount County, AL, Calhoun County, AL, Cherokee County, AL, Cleburne County, AL, Colbert County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Fayette County, AL, Franklin County, AL, Greene County, AL, Jackson County, AL, Jefferson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Pickens County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL
The radar
The Birmingham radar (KBMX), 112 km from the middle of the area, began a volume at 03:56 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 00:00Z, 3.9 hours before the alert went out and 111 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
- 2035 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 1827 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 13 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
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 3, 11:59 PM CDT | Severe Thunderstorm Watch | SPC | Bibb, Blount, Calhoun, Cherokee, Clay, Cleburne and 24 more | 7 hr |
| Aug 4, 1:25 AM CDT | Mesoscale Discussion | SPC | Blount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 18 more | 95 min |
| Aug 4, 12:09 PM CDT | Mesoscale Discussion | SPC | Butler, Choctaw, Clarke, Coffee, Conecuh, Covington and 8 more | 66 min |
| Aug 4, 3:06 PM CDT | Mesoscale Discussion | SPC | Colbert, Fayette, Franklin, Lamar, Marion, Pickens | 54 min |
| Aug 4, 3:41 PM CDT | Severe Thunderstorm Watch | SPC | Fayette, Greene, Lamar, Marion, Pickens, Sumter | 5 hr |
| Aug 4, 6:06 PM CDT | Mesoscale Discussion | SPC | Colbert, Fayette, Franklin, Greene, Lamar, Lauderdale and 3 more | 54 min |
Nearby
Mesoscale Discussions in Alabama, 2011Every mesoscale discussion in 2011
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.