Alert archive / Alabama / Mesoscale Discussions in 2011
Mesoscale Discussion 1852
The Storm Prediction Center issued this mesoscale discussion at Aug 4, 2011, 12:09 PM CDT for 14 counties in Alabama; Holmes County, Florida; 5 counties in Mississippi. It was in force for 66 min.
The area
The outline as issued.
The facts
- Issued
- Aug 4, 2011, 12:09 PM CDT (17:09 UTC)
- Expired
- Aug 4, 2011, 1:15 PM CDT
- In force
- 66 min
- Issued by
- the Storm Prediction Center
Counties Butler County, AL, Choctaw County, AL, Clarke County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Monroe County, AL, Washington County, AL, Holmes County, FL, Clarke County, MS, Greene County, MS, Jasper County, MS, Jones County, MS, Wayne County, MS
The radar
The Mobile radar (KMOB), 127 km from the middle of the area, began a volume at 17:12 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 12:00Z, 5.2 hours before the alert went out and 187 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
- 496 J/kg
- Mixed-layer CIN
- -354 J/kg
- Mixed-layer LCL
- 1432 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -34 m²/s²
- 0-3 km storm-relative helicity
- -66 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 3, 10:52 PM CDT | Mesoscale Discussion | SPC | Bibb, Blount, Calhoun, Cherokee, Cleburne, Colbert and 23 more | 83 min |
| 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, 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 |
| Aug 4, 8:06 AM CDT | Severe Thunderstorm Watch | SPC | Alcorn, Benton, DeSoto, Itawamba, Lee, Marshall and 5 more | 4 hr |
Nearby
Mesoscale Discussions in Alabama, 2011Mesoscale Discussions in Mississippi, 2011Mesoscale Discussions in Florida, 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.