Alert archive / South Carolina / Mesoscale Discussions in 2012
Mesoscale Discussion 610
The Storm Prediction Center issued this mesoscale discussion at Apr 27, 2012, 8:54 PM EDT for 6 counties in Georgia; 32 counties in South Carolina. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- Apr 27, 2012, 8:54 PM EDT (00:54 UTC)
- Expired
- Apr 27, 2012, 10:30 PM EDT
- In force
- 96 min
- Issued by
- the Storm Prediction Center
All 38 counties
Columbia County, GA, Elbert County, GA, Hart County, GA, Lincoln County, GA, Oglethorpe County, GA, Wilkes County, GA, Abbeville County, SC, Aiken County, SC, Anderson County, SC, Berkeley County, SC, Calhoun County, SC, Chester County, SC, Clarendon County, SC, Darlington County, SC, Dillon County, SC, Edgefield County, SC, Fairfield County, SC, Florence County, SC, Georgetown County, SC, Greenville County, SC, Greenwood County, SC, Horry County, SC, Kershaw County, SC, Lancaster County, SC, Laurens County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, McCormick County, SC, Newberry County, SC, Oconee County, SC, Orangeburg County, SC, Pickens County, SC, Richland County, SC, Saluda County, SC, Sumter County, SC, Union County, SC, Williamsburg County, SC
The radar
The Columbia radar (KCAE), 41 km from the middle of the area, began a volume at 00:54 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 00:00Z, 0.9 hours before the alert went out and 197 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
- 10 J/kg
- Mixed-layer CIN
- -276 J/kg
- Mixed-layer LCL
- 1877 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 99 m²/s²
- 0-3 km storm-relative helicity
- 126 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
950 ACUS11 KWNS 280054 SWOMCD SPC MCD 280054 NCZ000-SCZ000-GAZ000-280230- MESOSCALE DISCUSSION 0610 NWS STORM PREDICTION CENTER NORMAN OK 0754 PM CDT FRI APR 27 2012 AREAS AFFECTED...PORTIONS OF ERN GA...NRN AND CNTRL SC...SRN NC CONCERNING...SEVERE THUNDERSTORM WATCH 195... VALID 280054Z - 280230Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 195 CONTINUES. AT 0045Z...MULTICELL CLUSTERS CONTINUE TO PERSIST ALONG A FRONTAL ZONE FROM ROUGHLY 10 N OF AHN IN ERN GA EWD ACROSS CNTRL/NRN SC INTO SRN NC. SURFACE OBSERVATIONS ALONG AND S OF THE FRONT INDICATE THAT THE BOUNDARY LAYER IS COOLING/STABILIZING WITH LOSS OF DAYTIME HEATING...RESULTING IN RAPIDLY WEAKENING LOW-LEVEL LAPSE RATES AND MLCAPE VALUES FALLING TO AROUND 500 J/KG BASED ON OBJECTIVE ANALYSIS GUIDANCE. GIVEN THESE TRENDS...AS WELL AS A LACK OF LARGE-SCALE FORCING FOR ASCENT OVER THE REGION...STORM CLUSTERS WILL LIKELY DECREASE IN INTENSITY DURING THE NIGHT AS THEY DRIFT EWD ACROSS WW 195...WHICH WILL RESULT IN AN INCREASINGLY MORE ISOLATED SVR WEATHER THREAT. ..GARNER.. 04/28/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...ILM...CHS...CAE...GSP...FFC... LAT...LON 35068311 34437884 32987884 33628311 35068311
Nearby
Mesoscale Discussions in South Carolina, 2012Mesoscale Discussions in Georgia, 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.