Alert archive / Georgia / Mesoscale Discussions in 2011
Mesoscale Discussion 296
The Storm Prediction Center issued this mesoscale discussion at Mar 27, 2011, 6:24 PM CDT for 10 counties in Alabama; 25 counties in Florida; 40 counties in Georgia. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 27, 2011, 6:24 PM CDT (23:24 UTC)
- Expired
- Mar 27, 2011, 8:30 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 75 counties
Baldwin County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Washington County, AL, Baker County, FL, Bay County, FL, Calhoun County, FL, Columbia County, FL, Escambia County, FL, Gadsden County, FL, Gilchrist County, FL, Gulf County, FL, Hamilton County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Nassau County, FL, Okaloosa County, FL, Santa Rosa County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brantley County, GA, Brooks County, GA, Calhoun County, GA, Camden County, GA, Charlton County, GA, Clay County, GA, Clinch County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Echols County, GA, Glynn County, GA, Grady County, GA, Irwin County, GA, Lanier County, GA, Lee County, GA, Long County, GA, Lowndes County, GA, McIntosh County, GA, Miller County, GA, Mitchell County, GA, Pierce County, GA, Randolph County, GA, Seminole County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Ware County, GA, Wayne County, GA, Worth County, GA
The radar
The Tallahassee radar (KTLH), 37 km from the middle of the area, began a volume at 23:28 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
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 11.4 hours before the alert went out and 39 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
- 1068 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 620 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 174 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 1.1
- Supercell composite
- 6.0
The text
As transmitted, in the capitals the NWS used until 2016.
866
ACUS11 KWNS 272324
SWOMCD
SPC MCD 272324
GAZ000-FLZ000-ALZ000-280130-
MESOSCALE DISCUSSION 0296
NWS STORM PREDICTION CENTER NORMAN OK
0624 PM CDT SUN MAR 27 2011
AREAS AFFECTED...EXTREME SRN PORTIONS GA/AL...EXTREME NRN FL...FL
PANHANDLE.
CONCERNING...SEVERE THUNDERSTORM WATCH 69...
VALID 272324Z - 280130Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 69
CONTINUES.
BAND OF CONVECTION IS EXPECTED TO CONTINUE MOVING SLOWLY SEWD ACROSS
ERN PORTIONS WW...WHILE A FEW EMBEDDED SUPERCELLS PRODUCING LARGE
HAIL WILL MOVE ESEWD. WW MAY BE CLEARED N OF GA PORTION WHERE
GREATER TSTM COVERAGE HAS MORE STRONGLY STABILIZED BOUNDARY LAYER.
S-CENTRAL AL PORTIONS WW...ADJACENT TO FL BORDER...SHOULD BE
MAINTAINED BECAUSE...
1. AIR MASS THERE HAS NOT BEEN SUBSTANTIALLY STABILIZED BY PRIOR
CONVECTION...WITH 1000-1500 J/KG MLCAPE EVIDENT IN MODIFIED RUC
SOUNDINGS S OF FRONT...AND
2. CONVECTION INCREASING IN COVERAGE N OF MOB DURING PAST HOUR MAY
MOVE IN AND NEAR WW AREA BEFORE SCHEDULED 03Z EXPIRATION.
SFC MESOANALYSIS SHOWS WAVY COLD FRONT...WITH A COUPLE OF
WEAK/ATTACHED MESOLOWS...FROM MIDDLE PORTIONS GA COAST WWD TO NEAR
TOI...TO JUST N GZH...TO NEAR MCB. WITH FLOW ALOFT BEING NEARLY
PARALLEL TO THIS BOUNDARY...AND NO SUBSTANTIAL PERTURBATIONS BEHIND
WEAK TROUGH PASSING OVER SERN GA...FRONT SHOULD DRIFT SLOWLY SWD
ACROSS SERN GA WHILE BECOMING QUASISTATIONARY ELSEWHERE. LARGE HAIL
WILL REMAIN DOMINANT SVR THREAT WITH THIS ACTIVITY...MUCH OF WHICH
IS MOVING ATOP SHALLOW OUTFLOW AIR LEFT BY PRIOR CONVECTION.
HOWEVER...MOST INTENSE CONVECTION MAY PRODUCE A FEW DAMAGING GUSTS
AS WELL AS IT CROSSES AREAS ON EITHER SIDE OF NRN BORDER OF FL.
AFTER 00Z...COMBINATION OF POSTFRONTAL CAA AND DIABATIC COOLING WILL
REINFORCE STATIC STABILITY OVER S-CENTRAL/SERN GA...AND FROM N-S
ACROSS SRN AL. MEANWHILE...AVAILABLE BUOYANCY AT AND JUST ABOVE
SFC...AMIDST 45-55 KT EFFECTIVE SHEAR MAGNITUDES...SHOULD SUPPORT
POTENTIAL FOR HAIL-PRODUCING SUPERCELLS.
..EDWARDS.. 03/27/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CHS...JAX...FFC...TAE...BMX...MOB...
LAT...LON 30688146 30318185 29768261 29508341 29658343 29758358
29978376 30098407 29588500 29708522 29688539 29908539
30238592 30388653 30328721 30258772 30678819 31448843
31588711 31848473 31798106 30688146SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 26, 7:47 PM CDT | Tornado Watch | SPC | Bibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 17 more | 7 hr |
| Mar 26, 11:21 PM CDT | Mesoscale Discussion | SPC | Bibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 17 more | 54 min |
| Mar 27, 7:33 AM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Chambers, Chilton, Clay, Coosa and 16 more | 117 min |
| Mar 27, 8:55 AM CDT | Severe Thunderstorm Watch | SPC | Autauga, Barbour, Bullock, Butler, Chambers, Chilton and 17 more | 7 hr |
| Mar 27, 10:51 AM CDT | Mesoscale Discussion | SPC | Barbour, Coffee, Covington, Crenshaw, Dale, Geneva and 3 more | 84 min |
| Mar 27, 2:49 PM CDT | Mesoscale Discussion | SPC | Baldwin, Coffee, Covington, Dale, Geneva, Henry and 1 more | 56 min |
| Mar 27, 3:27 PM CDT | Severe Thunderstorm Watch | SPC | Coffee, Covington, Dale, Escambia, Geneva, Henry and 1 more | 5 hr |
| Mar 26, 7:55 PM CDT | Mesoscale Discussion | SPC | Banks, Barrow, Bartow, Catoosa, Chattooga, Cherokee and 36 more | 95 min |
| Mar 26, 8:19 PM CDT | Severe Thunderstorm Watch | SPC | Banks, Barrow, Bartow, Burke, Catoosa, Chattooga and 39 more | 8 hr |
| Mar 26, 10:10 PM CDT | Mesoscale Discussion | SPC | Bryan, Bulloch, Candler, Chatham, Effingham, Evans and 3 more | 65 min |
| Mar 26, 11:43 PM CDT | Mesoscale Discussion | SPC | Banks, Barrow, Bartow, Burke, Catoosa, Chattooga and 38 more | 62 min |
| Mar 27, 2:03 AM CDT | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Ben Hill, Bibb, Bleckley and 40 more | 57 min |
| Mar 27, 2:25 AM CDT | Tornado Watch | SPC | Appling, Baldwin, Bibb, Bleckley, Bryan, Bulloch and 46 more | 3 hr |
Nearby
Mesoscale Discussions in Georgia, 2011Mesoscale Discussions in Florida, 2011Mesoscale 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.