Alert archive / South Carolina / Mesoscale Discussions in 2012
Mesoscale Discussion 1930
The Storm Prediction Center issued this mesoscale discussion at Sep 8, 2012, 1:14 PM EDT for 12 counties in North Carolina; 21 counties in South Carolina. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 8, 2012, 1:14 PM EDT (17:14 UTC)
- Expired
- Sep 8, 2012, 3:15 PM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 33 counties
Cabarrus County, NC, Catawba County, NC, Cleveland County, NC, Gaston County, NC, Iredell County, NC, Lincoln County, NC, Mecklenburg County, NC, Polk County, NC, Rowan County, NC, Rutherford County, NC, Stanly County, NC, Union County, NC, Abbeville County, SC, Aiken County, SC, Anderson County, SC, Calhoun County, SC, Cherokee County, SC, Chester County, SC, Edgefield County, SC, Fairfield County, SC, Greenville County, SC, Greenwood County, SC, Kershaw County, SC, Lancaster County, SC, Laurens County, SC, Lexington County, SC, Newberry County, SC, Pickens County, SC, Richland County, SC, Saluda County, SC, Spartanburg County, SC, Union County, SC, York County, SC
The radar
The Greer radar (KGSP), 62 km from the middle of the area, began a volume at 17:16 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 5.2 hours before the alert went out and 206 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
- 305 J/kg
- Mixed-layer CIN
- -62 J/kg
- Mixed-layer LCL
- 814 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 68 m²/s²
- 0-3 km storm-relative helicity
- 44 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
914
ACUS11 KWNS 081715
SWOMCD
SPC MCD 081714
SCZ000-NCZ000-081915-
MESOSCALE DISCUSSION 1930
NWS STORM PREDICTION CENTER NORMAN OK
1214 PM CDT SAT SEP 08 2012
AREAS AFFECTED...SWRN NC...CNTRL/WRN SC
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 081714Z - 081915Z
PROBABILITY OF WATCH ISSUANCE...40 PERCENT
SUMMARY...THE THREAT FOR SVR STORMS WILL INCREASE THIS
AFTERNOON...AND THE ISSUANCE OF A SEVERE THUNDERSTORM WATCH IS
POSSIBLE.
DISCUSSION...AS LARGE-SCALE FORCING FOR ASCENT STRENGTHENS...
SCATTERED THUNDERSTORMS WILL CONTINUE TO DEVELOP IN ADVANCE OF A
COLD FRONT CURRENTLY CROSSING THE APPALACHIANS. A LEE TROUGH...ALONG
WITH SUBTLE PRE-FRONTAL MOISTURE/THERMAL GRADIENTS...WILL SERVE AS
THE PRIMARY FOCI FOR LIFT AMIDST 1500-2500 J/KG OF UNINHIBITED
MLCAPE PER MODIFIED 12Z RAOBS. MID-LEVEL FLOW IS COMPARATIVELY
WEAKER OVER THIS REGION RELATIVE TO LOCATIONS FARTHER NORTH...THOUGH
20-30 KT OF EFFECTIVE BULK SHEAR THROUGH THE AFTERNOON MAY SUPPORT
ORGANIZED MULTICELL CLUSTERS WITH DMGG WIND GUSTS AND PERHAPS
MARGINALLY SVR HAIL.
..COHEN/THOMPSON.. 09/08/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...RAH...CAE...GSP...
LAT...LON 35148281 35938134 35708044 35108008 33698048 33418169
34378274 35148281SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 8, 12:20 PM EDT | Mesoscale Discussion | SPC | Alamance, Alexander, Alleghany, Caswell, Davidson, Davie and 10 more | 115 min |
| Sep 8, 1:48 PM EDT | Severe Thunderstorm Watch | SPC | Alamance, Alexander, Anson, Cabarrus, Caswell, Catawba and 44 more | 7 hr |
| Sep 8, 3:25 PM EDT | Mesoscale Discussion | SPC | Alamance, Alexander, Cabarrus, Caswell, Catawba, Chatham and 33 more | 65 min |
| Sep 8, 7:10 PM EDT | Mesoscale Discussion | SPC | Beaufort, Bertie, Bladen, Chowan, Craven, Cumberland and 23 more | 65 min |
Nearby
Mesoscale 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.