Alert archive / Georgia / Mesoscale Discussions in 2011
Mesoscale Discussion 2134
The Storm Prediction Center issued this mesoscale discussion at Sep 5, 2011, 3:15 PM CDT for 15 counties in Alabama; 15 counties in Florida; 26 counties in Georgia. It was in force for 30 min.
The area
The outline as issued.
The facts
- Issued
- Sep 5, 2011, 3:15 PM CDT (20:15 UTC)
- Expired
- Sep 5, 2011, 3:45 PM CDT
- In force
- 30 min
- Issued by
- the Storm Prediction Center
All 56 counties
Barbour County, AL, Bullock County, AL, Chambers County, AL, Coffee County, AL, Dale County, AL, Elmore County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Lee County, AL, Macon County, AL, Montgomery County, AL, Pike County, AL, Russell County, AL, Tallapoosa County, AL, Bay County, FL, Calhoun County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Taylor County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brooks County, GA, Calhoun County, GA, Clay County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Irwin County, GA, Lanier County, GA, Lee County, GA, Lowndes County, GA, Miller County, GA, Mitchell County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Worth County, GA
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 8.3 hours before the alert went out and 86 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
- 2763 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 465 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 223 m²/s²
- 0-3 km storm-relative helicity
- 266 m²/s²
- Significant tornado parameter
- 2.6
- Supercell composite
- 17.8
The text
As transmitted, in the capitals the NWS used until 2016.
521
ACUS11 KWNS 052015
SWOMCD
SPC MCD 052015
GAZ000-FLZ000-ALZ000-052045-
MESOSCALE DISCUSSION 2134
NWS STORM PREDICTION CENTER NORMAN OK
0315 PM CDT MON SEP 05 2011
AREAS AFFECTED...PARTS OF ERN/SERN AL...FL PANHANDLE AND SWRN GA
CONCERNING...TORNADO WATCH 838...
VALID 052015Z - 052045Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 838 CONTINUES.
TORNADO WATCH 838 IS CURRENTLY SCHEDULED TO EXPIRE AT 21Z. PARTS OF
THIS WATCH OVER ERN AL WILL LIKELY NEED TO BE REPLACED WITH A NEW
TORNADO WATCH...WHILE FARTHER TO THE SE OVER PARTS SERN AL...THE FL
PANHANDLE AND INTO SWRN GA...A SEVERE TSTM WATCH /#841/ HAS BEEN
ISSUED.
...ERN AL...
MID AFTERNOON TRENDS IN RADAR IMAGERY AND SURFACE OBSERVATIONS
SHOWED AN AREA OF LOW PRESSURE SHIFTING ENEWD INTO SOUTH CENTRAL AL
WITH STRONGEST LOW LEVEL FLOW/SHEAR EXTENDING FROM SERN AL INTO
CENTRAL/NRN GA. GIVEN THESE FACTORS...A NEW TORNADO WATCH WILL
LIKELY BE NEEDED OVER PARTS OF ERN AL AS THE THREAT FOR TORNADOES
AND DAMAGING WINDS WILL PERSIST ALONG AND ENE OF THE TRACK OF THE
SURFACE LOW TOWARD NWRN GA.
...PARTS OF SERN AL...FL PANHANDLE INTO SWRN GA...
A DEEPER MIXED BOUNDARY LAYER AND WEAKER LOW LEVEL SHEAR IS
RESULTING IN A GREATER THREAT FOR DAMAGING WINDS...THAN A TORNADO
THREAT. STRONG UNI-DIRECTIONAL /SLY/ WIND FIELDS SUPPORTS THIS
THREAT FOR DAMAGING WINDS...AS THE AIR MASS OVER THESE AREAS REMAINS
MODERATELY UNSTABLE AND SUFFICIENTLY SHEARED THROUGH A DEEP LAYER
FOR ORGANIZED LINE SEGMENTS.
..PETERS.. 09/05/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...JAX...FFC...TAE...BMX...MOB...
LAT...LON 31908488 31818304 30968301 30218323 29678305 29618336
30038400 29778480 29688517 30488634 31008622 31558611
32408629 32908605 33318530 31908488SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 4, 9:42 PM CDT | Tornado Watch | SPC | Autauga, Baldwin, Butler, Choctaw, Clarke, Conecuh and 16 more | 9 hr |
| Sep 4, 11:35 PM CDT | Mesoscale Discussion | SPC | Baldwin, Choctaw, Clarke, Conecuh, Covington, Escambia and 6 more | 115 min |
| Sep 5, 4:26 AM CDT | Mesoscale Discussion | SPC | Autauga, Baldwin, Barbour, Bibb, Bullock, Butler and 41 more | 94 min |
| Sep 5, 5:35 AM CDT | Tornado Watch | SPC | Autauga, Baldwin, Barbour, Bibb, Blount, Bullock and 50 more | 10 hr |
| Sep 5, 7:24 AM CDT | Mesoscale Discussion | SPC | Autauga, Barbour, Bibb, Bullock, Butler, Calhoun and 20 more | 66 min |
| Sep 5, 11:01 AM CDT | Mesoscale Discussion | SPC | Autauga, Baldwin, Barbour, Bibb, Blount, Bullock and 41 more | 29 min |
| Sep 5, 3:04 PM CDT | Severe Thunderstorm Watch | SPC | Coffee, Dale, Geneva, Henry, Houston | 6 hr |
| Sep 5, 3:49 PM CDT | Tornado Watch | SPC | Autauga, Barbour, Bullock, Calhoun, Chambers, Chilton and 16 more | 4 hr |
| Sep 5, 6:37 PM CDT | Mesoscale Discussion | SPC | Barbour, Bullock, Calhoun, Chambers, Clay, Cleburne and 9 more | 113 min |
| Sep 5, 5:24 PM CDT | Mesoscale Discussion | SPC | Alachua, Baker, Columbia, Gilchrist, Hamilton, Levy and 1 more | 66 min |
| Sep 5, 11:10 AM CDT | Tornado Watch | SPC | Bartow, Bibb, Butts, Carroll, Chattahoochee, Chattooga and 46 more | 4 hr |
| Sep 5, 12:23 PM CDT | Mesoscale Discussion | SPC | Baldwin, Burke, Columbia, Elbert, Emanuel, Glascock and 17 more | 67 min |
| Sep 5, 2:05 PM CDT | Mesoscale Discussion | SPC | Baldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 75 more | 55 min |
| Sep 5, 2:42 PM CDT | Tornado Watch | SPC | Baldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 81 more | 7 hr |
| Sep 5, 4:48 PM CDT | Mesoscale Discussion | SPC | Appling, Bacon, Brantley, Bryan, Bulloch, Camden and 19 more | 87 min |
| Sep 5, 5:12 PM CDT | Severe Thunderstorm Watch | SPC | Burke, Richmond | 4 hr |
Nearby
Mesoscale Discussions in Georgia, 2011Mesoscale Discussions in Alabama, 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.