Alert archive / Georgia / Mesoscale Discussions in 2011
Mesoscale Discussion 285
The Storm Prediction Center issued this mesoscale discussion at Mar 26, 2011, 8:55 PM EDT for 4 states. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Mar 26, 2011, 8:55 PM EDT (00:55 UTC)
- Expired
- Mar 26, 2011, 10:30 PM EDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
All 57 counties
Banks County, GA, Barrow County, GA, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Clarke County, GA, Columbia County, GA, Dade County, GA, Dawson County, GA, Elbert County, GA, Fannin County, GA, Floyd County, GA, Forsyth County, GA, Franklin County, GA, Gilmer County, GA, Gordon County, GA, Greene County, GA, Habersham County, GA, Hall County, GA, Hart County, GA, Jackson County, GA, Lincoln County, GA, Lumpkin County, GA, Madison County, GA, McDuffie County, GA, Morgan County, GA, Murray County, GA, Oconee County, GA, Oglethorpe County, GA, Pickens County, GA, Rabun County, GA, Stephens County, GA, Taliaferro County, GA, Towns County, GA, Union County, GA, Walker County, GA, Walton County, GA, Warren County, GA, White County, GA, Whitfield County, GA, Wilkes County, GA, Cherokee County, NC, Clay County, NC, Macon County, NC, Abbeville County, SC, Anderson County, SC, Edgefield County, SC, Greenville County, SC, Greenwood County, SC, Laurens County, SC, McCormick County, SC, Newberry County, SC, Oconee County, SC, Pickens County, SC, Saluda County, SC, Polk County, TN
The radar
The Atlanta radar (KFFC), 137 km from the middle of the area, began a volume at 00:57 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
Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 0.9 hours before the alert went out and 132 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
- 120 J/kg
- Mixed-layer CIN
- -166 J/kg
- Mixed-layer LCL
- 635 m above ground
- 0-6 km bulk shear
- 67 kt
- 0-1 km storm-relative helicity
- 343 m²/s²
- 0-3 km storm-relative helicity
- 404 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.7
The text
As transmitted, in the capitals the NWS used until 2016.
539
ACUS11 KWNS 270056
SWOMCD
SPC MCD 270055
SCZ000-GAZ000-NCZ000-TNZ000-270230-
MESOSCALE DISCUSSION 0285
NWS STORM PREDICTION CENTER NORMAN OK
0755 PM CDT SAT MAR 26 2011
AREAS AFFECTED...NRN GA...FAR SE TN...NW SC..SW NC
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 270055Z - 270230Z
ELEVATED CONVECTION HAS INCREASED UPSTREAM ACROSS NRN MS AND
AL...INCLUDING SOME ELEVATED SUPERCELLS CAPABLE OF PRODUCING LARGE
HAIL. THIS ACTIVITY IS BEING FUELED BY A STRONG LOW-LEVEL JET AND A
COMPACT VORTICITY MAXIMUM MOVING QUICKLY EAST ACROSS THE OHIO
VALLEY. 00Z FFC SOUNDING INDICATES SUBSTANTIAL ELEVATED BUOYANCY /MU
CAPE AROUND 1500 J/KG/ AND SUFFICIENT EFFECTIVE SHEAR FOR
SUPERCELLS. A SEVERE HAIL THREAT WILL EXIST FOR SEVERAL MORE HOURS
ACROSS NRN GA...WITH A SOMEWHAT LESSER THREAT ACROSS FAR SE TN...NW
SC...AND SW NC...WHERE AVAILABLE BUOYANCY BECOMES WEAKER AND
INCREASINGLY ELEVATED.
IF ONGOING ACTIVITY MAINTAINS ITS INTENSITY AS IT MOVES EAST...A
SEVERE THUNDERSTORM WATCH MAY BECOME NECESSARY IN THE NEXT 1-2
HRS...ESPECIALLY ACROSS NRN GA.
..DEAN.. 03/27/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CAE...GSP...MRX...FFC...
LAT...LON 34118511 34228540 34518547 34868557 34998516 35278458
35348394 35278332 35158275 34898213 34548165 34358148
33978145 33618176 33428198 33368231 33428272 33508316
33548355 33978399 34218426 34128446 34108470 34118511SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 26, 8:47 PM EDT | Tornado Watch | SPC | Baldwin, Ben Hill, Bibb, Bleckley, Butts, Carroll and 61 more | 7 hr |
| Mar 26, 9:19 PM EDT | Severe Thunderstorm Watch | SPC | Banks, Barrow, Bartow, Burke, Catoosa, Chattooga and 39 more | 8 hr |
| Mar 26, 11:10 PM EDT | Mesoscale Discussion | SPC | Bryan, Bulloch, Candler, Chatham, Effingham, Evans and 3 more | 65 min |
| Mar 27, 12:21 AM EDT | Mesoscale Discussion | SPC | Baldwin, Bibb, Bleckley, Butts, Carroll, Chattahoochee and 55 more | 54 min |
| Mar 27, 12:43 AM EDT | Mesoscale Discussion | SPC | Banks, Barrow, Bartow, Burke, Catoosa, Chattooga and 38 more | 62 min |
| Mar 27, 3:03 AM EDT | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Ben Hill, Bibb, Bleckley and 40 more | 57 min |
| Mar 27, 3:25 AM EDT | Tornado Watch | SPC | Appling, Baldwin, Bibb, Bleckley, Bryan, Bulloch and 46 more | 3 hr |
| Mar 27, 8:33 AM EDT | Mesoscale Discussion | SPC | Baldwin, Bibb, Bleckley, Bulloch, Burke, Butts and 48 more | 117 min |
| Mar 27, 9:55 AM EDT | Severe Thunderstorm Watch | SPC | Appling, Atkinson, Bacon, Baker, Baldwin, Ben Hill and 87 more | 7 hr |
| Mar 27, 11:51 AM EDT | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 64 more | 84 min |
| Mar 27, 3:49 PM EDT | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 44 more | 56 min |
| Mar 27, 4:27 PM EDT | Severe Thunderstorm Watch | SPC | Appling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 38 more | 5 hr |
| Mar 27, 7:24 PM EDT | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 34 more | 2 hr |
Nearby
Mesoscale Discussions in Georgia, 2011Mesoscale Discussions in South Carolina, 2011Mesoscale Discussions in North Carolina, 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.