Alert archive / Georgia / Mesoscale Discussions in 2011

Mesoscale Discussion 1239

June 15, 201153 counties in Georgia; 10 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Jun 15, 2011, 10:11 PM EDT for 53 counties in Georgia; 10 counties in South Carolina. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jun 15, 2011, 10:11 PM EDT (02:11 UTC)
Expired: Jun 15, 2011, 11:45 PM EDT
In force: 94 min
Issued by: the Storm Prediction Center

All 63 counties

Baldwin County, GA, Barrow County, GA, Bibb County, GA, Bryan County, GA, Bulloch County, GA, Burke County, GA, Butts County, GA, Candler County, GA, Carroll County, GA, Clarke County, GA, Clayton County, GA, Cobb County, GA, Columbia County, GA, Coweta County, GA, DeKalb County, GA, Douglas County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Fayette County, GA, Fulton County, GA, Glascock County, GA, Greene County, GA, Gwinnett County, GA, Hancock County, GA, Henry County, GA, Jasper County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Jones County, GA, Lamar County, GA, McDuffie County, GA, Monroe County, GA, Morgan County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Paulding County, GA, Putnam County, GA, Richmond County, GA, Rockdale County, GA, Screven County, GA, Spalding County, GA, Taliaferro County, GA, Tattnall County, GA, Treutlen County, GA, Twiggs County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Wilkes County, GA, Wilkinson County, GA, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Calhoun County, SC, Colleton County, SC, Dorchester County, SC, Hampton County, SC, Jasper County, SC, Orangeburg County, SC

The radar

The Robins AFB radar (KJGX), 97 km from the middle of the area, began a volume at 02:13 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 00:00Z, 2.2 hours before the alert went out and 116 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1682 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 2119 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

837 
ACUS11 KWNS 160212
SWOMCD
SPC MCD 160211
SCZ000-GAZ000-160345-

MESOSCALE DISCUSSION 1239
NWS STORM PREDICTION CENTER NORMAN OK
0911 PM CDT WED JUN 15 2011

AREAS AFFECTED...NORTHERN/EASTERN GA TO COASTAL SC

CONCERNING...SEVERE THUNDERSTORM WATCH 481...482...

VALID 160211Z - 160345Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
481...482...CONTINUES.

SEVERE TSTM WATCHES 481/482 CONTINUE UNTIL 04Z/05Z RESPECTIVELY.
ACROSS NORTHERN/EASTERN GA AND COASTAL SC...DAMAGING WINDS/SOME
SEVERE HAIL WILL REMAIN POSSIBLE BUT ON AN INCREASINGLY ISOLATED
BASIS...WITH LOCALLY HEAVY RAINFALL OTHERWISE A CONCERN.

ACROSS EASTERN GA AND THE PIEDMONT/COASTAL PLAIN OF SC...A STRONG
COLD POOL/ASSOCIATED GUST FRONT CONTINUES TO DRIVE A RELATIVELY FAST
MOVING QUASI-LINEAR CONVECTIVE LINE SOUTHEASTWARD ACROSS THE
REGION...WITH THE QLCS NOW INTERACTING WITH THE INLAND ADVANCING SEA
BREEZE. GIVEN THE ORGANIZATION/FORWARD MOMENTUM OF THE
QLCS...DAMAGING WINDS WILL LIKELY REMAIN A CONCERN ACROSS FAR EAST
GA/SC COASTAL PLAIN IN THE SHORT TERM.

FARTHER WEST...DEEP CONVECTION WILL CONTINUE TO BE FOCUSED WITH A
NORTHWEST-SOUTHEAST GENERAL CORRIDOR FROM NEAR THE TN/AR BORDER INTO
NORTHERN/CENTRAL GA THIS EVENING. THIS CONVECTION WILL CONTINUE TO
BE FOCUSED ALONG AND JUST NORTHEAST /ESPECIALLY ACROSS GA/ OF THE
OUTFLOW/COLD POOL INDUCED EFFECTIVE BOUNDARY. DAMAGING WINDS /MAINLY
SOUTHWEST FLANK OF ONGOING CONVECTION/ AND SOME HAIL WILL REMAIN
POSSIBLE BUT ON AN INCREASINGLY ISOLATED BASIS...WITH LOCALLY
HEAVY/TRAINING RAINFALL OTHERWISE A CONCERN.

..GUYER.. 06/16/2011

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...CHS...CAE...FFC...

LAT...LON   33678522 34128512 34188448 34168415 33948332 33678234
            33798150 33918027 32818028 31838168 32928403 33378492
            33678522

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 15, 9:27 PM EDT	Severe Thunderstorm Watch	SPC	Bryan, Bulloch, Candler, Chatham, Effingham, Evans and 6 more	6 hr
Jun 16, 12:48 AM EDT	Mesoscale Discussion	SPC	Appling, Bacon, Ben Hill, Bleckley, Bryan, Chatham and 24 more	57 min

Nearby

Mesoscale Discussions in Georgia, 2011 Mesoscale Discussions in South Carolina, 2011 Every 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.