Alert archive / Georgia / Mesoscale Discussions in 2012
Mesoscale Discussion 1340
The Storm Prediction Center issued this mesoscale discussion at Jul 1, 2012, 4:15 PM EDT for 31 counties in Georgia; 9 counties in North Carolina; 31 counties in South Carolina. It was in force for 90 min.
The area
The outline as issued.
The facts
- Issued
- Jul 1, 2012, 4:15 PM EDT (20:15 UTC)
- Expired
- Jul 1, 2012, 5:45 PM EDT
- In force
- 90 min
- Issued by
- the Storm Prediction Center
All 71 counties
Baldwin County, GA, Bleckley County, GA, Bryan County, GA, Bulloch County, GA, Burke County, GA, Candler County, GA, Columbia County, GA, Dodge County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Glascock County, GA, Hancock County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Laurens County, GA, Liberty County, GA, McDuffie County, GA, Montgomery County, GA, Pulaski County, GA, Richmond County, GA, Screven County, GA, Tattnall County, GA, Toombs County, GA, Treutlen County, GA, Twiggs County, GA, Warren County, GA, Washington County, GA, Wheeler County, GA, Wilkinson County, GA, Bladen County, NC, Brunswick County, NC, Columbus County, NC, Duplin County, NC, New Hanover County, NC, Pender County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Beaufort County, SC, Berkeley County, SC, Calhoun County, SC, Charleston County, SC, Chesterfield County, SC, Clarendon County, SC, Colleton County, SC, Darlington County, SC, Dillon County, SC, Dorchester County, SC, Edgefield County, SC, Fairfield County, SC, Florence County, SC, Georgetown County, SC, Hampton County, SC, Horry County, SC, Jasper County, SC, Kershaw County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, Marlboro County, SC, Orangeburg County, SC, Richland County, SC, Saluda County, SC, Sumter County, SC, Williamsburg County, SC
The radar
The Columbia radar (KCAE), 76 km from the middle of the area, began a volume at 20:16 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
Charleston AFB, SC (KCHS), launched 12:00Z, 8.3 hours before the alert went out and 112 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
- 5275 J/kg
- Mixed-layer CIN
- -133 J/kg
- Mixed-layer LCL
- 1026 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 0 m²/s²
- 0-3 km storm-relative helicity
- -14 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
510
ACUS11 KWNS 012016
SWOMCD
SPC MCD 012015
NCZ000-SCZ000-GAZ000-012145-
MESOSCALE DISCUSSION 1340
NWS STORM PREDICTION CENTER NORMAN OK
0315 PM CDT SUN JUL 01 2012
AREAS AFFECTED...SERN NC...SC...CNTRL GA
CONCERNING...SEVERE THUNDERSTORM WATCH 445...
VALID 012015Z - 012145Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 445
CONTINUES.
SUMMARY...LARGE HAIL/ISOLATED DAMAGING WIND PERSISTS...WITH
POTENTIAL FOR SEVERE WIND GUSTS INCREASING IN SERN NC AND CNTRL/ERN
SC DURING THE NEXT FEW HOURS.
DISCUSSION...MOST INTENSE MULTICELL CLUSTERS HAVE REMAINED INVOF THE
BORDER OF WW/S 442/445 IN SRN NC TO N-CNTRL SC AND LARGE HAIL UP TO
2 INCHES HAS BEEN REPORTED WITH THIS ACTIVITY. MERGING OF CELLS
APPEARS TO BE LEADING TO UPSCALE GROWTH SIMILAR TO THE EVOLUTION OF
AN ACCELERATING LINE IN N-CNTRL/NERN NC. WITH 8.5-9.5 C/KM 700-500
MB LAPSE RATES SAMPLED IN 18Z CHS/MHX RAOBS...THE EXTREME
INSTABILITY SHOULD LEND ITSELF TO SUBSTANTIAL COLD POOL FORMATION
AND ACCELERATE S/SEWD PROPAGATION OF ONGOING ACTIVITY. THIS
EVOLUTION MAY YIELD BOWING SEGMENTS AND INCREASING
COVERAGE/INTENSITY OF SEVERE WIND GUSTS PRIMARILY TOWARD THE NC/SC
COASTAL PLAIN.
WITH SWRN EXTENT...DEEP-LAYER FLOW WEAKENS SUBSTANTIALLY TO THE
MID-LEVEL ANTICYCLONE CENTERED OVER CNTRL GA /PER AREA VWP DATA/.
THIS SUGGESTS COLD POOL EVOLUTION INTO GA WILL BE MORE DISORGANIZED
AND DEPENDENT ON STORM-SCALE PROCESSES TO YIELD MORE THAN SPORADIC
MICROBURSTS.
..GRAMS.. 07/01/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MHX...RAH...ILM...CHS...CAE...GSP...FFC...
LAT...LON 35007898 35117837 34897775 34697757 34277766 32977946
31768146 32238350 32868371 33368308 33868224 34408116
35007898SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 1, 1:39 PM EDT | Mesoscale Discussion | SPC | Burke, Columbia, Richmond | 96 min |
| Jul 1, 2:01 PM EDT | Severe Thunderstorm Watch | SPC | Bryan, Bulloch, Burke, Candler, Chatham, Columbia and 11 more | 9 hr |
| Jul 1, 2:08 PM EDT | Mesoscale Discussion | SPC | Baldwin, Barrow, Bartow, Bibb, Butts, Carroll and 62 more | 3 hr |
| Jul 1, 7:39 PM EDT | Mesoscale Discussion | SPC | Bryan, Bulloch, Burke, Candler, Chatham, Columbia and 13 more | 96 min |
| Jul 1, 9:27 AM EDT | Mesoscale Discussion | SPC | Alleghany, Ashe, Forsyth, Rockingham, Stokes, Surry and 3 more | 63 min |
| Jul 1, 9:44 AM EDT | Severe Thunderstorm Watch | SPC | Alleghany, Ashe, Caswell, Rockingham, Stokes, Surry and 3 more | 5 hr |
| Jul 1, 11:38 AM EDT | Mesoscale Discussion | SPC | Alamance, Alexander, Alleghany, Ashe, Avery, Caldwell and 12 more | 97 min |
| Jul 1, 12:56 PM EDT | Severe Thunderstorm Watch | SPC | Alamance, Anson, Beaufort, Bertie, Camden, Carteret and 51 more | 7 hr |
| Jul 1, 2:53 PM EDT | Mesoscale Discussion | SPC | Beaufort, Bertie, Bladen, Camden, Carteret, Chowan and 37 more | 97 min |
| Jul 1, 7:04 PM EDT | Mesoscale Discussion | SPC | Alamance, Beaufort, Bertie, Camden, Carteret, Caswell and 40 more | 56 min |
Nearby
Mesoscale Discussions in Georgia, 2012Mesoscale Discussions in South Carolina, 2012Mesoscale Discussions in North Carolina, 2012Every mesoscale discussion in 2012
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.