Alert archive / Georgia / Mesoscale Discussions in 2011
Mesoscale Discussion 1539
The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2011, 1:00 PM CDT for 28 counties in Alabama; 76 counties in Georgia; 4 counties in South Carolina. It was in force for 90 min.
The area
The outline as issued.
The facts
- Issued
- Jul 8, 2011, 1:00 PM CDT (18:00 UTC)
- Expired
- Jul 8, 2011, 2:30 PM CDT
- In force
- 90 min
- Issued by
- the Storm Prediction Center
All 108 counties
Autauga County, AL, Barbour County, AL, Bullock County, AL, Butler County, AL, Chambers County, AL, Clay County, AL, Coffee County, AL, Conecuh County, AL, Coosa County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Dallas County, AL, Elmore County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Monroe County, AL, Montgomery County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Tallapoosa County, AL, Wilcox County, AL, Baldwin County, GA, Banks County, GA, Barrow County, GA, Bibb County, GA, Bleckley County, GA, Butts County, GA, Calhoun County, GA, Carroll County, GA, Chattahoochee County, GA, Clarke County, GA, Clay County, GA, Clayton County, GA, Cobb County, GA, Columbia County, GA, Coweta County, GA, Crawford County, GA, DeKalb County, GA, Dooly County, GA, Douglas County, GA, Early County, GA, Elbert County, GA, Fayette County, GA, Forsyth County, GA, Franklin County, GA, Fulton County, GA, Glascock County, GA, Greene County, GA, Gwinnett County, GA, Hall County, GA, Hancock County, GA, Harris County, GA, Hart County, GA, Heard County, GA, Henry County, GA, Houston County, GA, Jackson County, GA, Jasper County, GA, Jones County, GA, Lamar County, GA, Lee County, GA, Lincoln County, GA, Macon County, GA, Madison County, GA, Marion County, GA, McDuffie County, GA, Meriwether County, GA, Monroe County, GA, Morgan County, GA, Muscogee County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Peach County, GA, Pike County, GA, Pulaski County, GA, Putnam County, GA, Quitman County, GA, Randolph County, GA, Rockdale County, GA, Schley County, GA, Spalding County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taliaferro County, GA, Taylor County, GA, Terrell County, GA, Troup County, GA, Twiggs County, GA, Upson County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Webster County, GA, Wilkes County, GA, Wilkinson County, GA, Abbeville County, SC, Edgefield County, SC, Greenwood County, SC, McCormick County, SC
The radar
The Atlanta radar (KFFC), 80 km from the middle of the area, began a volume at 18:03 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
Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 6.0 hours before the alert went out and 82 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
- 896 J/kg
- Mixed-layer CIN
- -61 J/kg
- Mixed-layer LCL
- 954 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 22 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
149
ACUS11 KWNS 081801
SWOMCD
SPC MCD 081800
SCZ000-GAZ000-ALZ000-FLZ000-081930-
MESOSCALE DISCUSSION 1539
NWS STORM PREDICTION CENTER NORMAN OK
0100 PM CDT FRI JUL 08 2011
AREAS AFFECTED...WRN SC...GA...SRN-ERN AL...WRN FL PANHANDLE
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 081800Z - 081930Z
AN ISOLATED WIND DAMAGE THREAT IS EXPECTED TO DEVELOP ACROSS SERN
AL...GA AND WRN SC THIS AFTERNOON. HOWEVER...THE THREAT SHOULD
REMAIN TOO MARGINAL TO WARRANT WW ISSUANCE.
SCATTERED THUNDERSTORMS ARE DEVELOPING ACROSS WRN SC SWWD ACROSS
CNTRL GA INTO SE AL AND THE WRN FL PANHANDLE THIS AFTERNOON ALONG AN
AXIS OF MODERATE TO STRONG INSTABILITY. AS SFC TEMPS CONTINUE TO
WARM....NEW CELLS WILL INITIATE WITH CONVECTIVE COVERAGE BECOMING
NUMEROUS OVER THE NEXT FEW HOURS. MESOANALYSIS CURRENTLY ESTIMATES
MLCAPE VALUES ACROSS THE MCD AREA FROM 2000 TO 3000 J/KG WITH SFC
DEWPOINTS IN THE LOWER 70S F AND 0-3 KM LAPSE RATES OF 7.5 TO 8.5
C/KM. THIS ENVIRONMENT COMBINED WITH WEAK DEEP LAYER SHEAR SHOULD BE
FAVORABLE FOR MARGINALLY SEVERE PULSE STORMS. AS THE STRONGER CELLS
BRIEFLY PULSE UP AND DOWN...ISOLATED WET DOWNBURSTS WILL BE
POSSIBLE.
..BROYLES.. 07/08/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CAE...GSP...FFC...TAE...BMX...MOB...
LAT...LON 31268502 31858384 32548306 32978257 33838185 34248202
34618284 34378386 34078458 33378591 32878666 32458728
31658780 30748745 30618651 31268502SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 12:01 PM CDT | Mesoscale Discussion | SPC | Calhoun, Cherokee, Chester, Chesterfield, Clarendon, Darlington and 20 more | 89 min |
Nearby
Mesoscale Discussions in Georgia, 2011Mesoscale Discussions in Alabama, 2011Mesoscale Discussions in South 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.