Alert archive / South Carolina / Mesoscale Discussions in 2012
Mesoscale Discussion 154
The Storm Prediction Center issued this mesoscale discussion at Feb 24, 2012, 11:10 AM EST for 7 counties in North Carolina; 17 counties in South Carolina. It was in force for 65 min.
The area
The outline as issued.
The facts
- Issued
- Feb 24, 2012, 11:10 AM EST (16:10 UTC)
- Expired
- Feb 24, 2012, 12:15 PM EST
- In force
- 65 min
- Issued by
- the Storm Prediction Center
All 24 counties
Bladen County, NC, Brunswick County, NC, Columbus County, NC, New Hanover County, NC, Onslow County, NC, Pender County, NC, Robeson County, NC, Bamberg County, SC, Barnwell County, SC, Calhoun County, SC, Clarendon County, SC, Darlington County, SC, Dillon County, SC, Florence County, SC, Horry County, SC, Kershaw County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, Marlboro County, SC, Orangeburg County, SC, Richland County, SC, Sumter County, SC, Williamsburg County, SC
The radar
The Columbia radar (KCAE), 114 km from the middle of the area, began a volume at 16:11 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
Charleston AFB, SC (KCHS), launched 12:00Z, 4.2 hours before the alert went out and 140 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
- 817 J/kg
- Mixed-layer CIN
- -120 J/kg
- Mixed-layer LCL
- 606 m above ground
- 0-6 km bulk shear
- 70 kt
- 0-1 km storm-relative helicity
- 350 m²/s²
- 0-3 km storm-relative helicity
- 365 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 9.4
The text
As transmitted, in the capitals the NWS used until 2016.
031 ACUS11 KWNS 241610 SWOMCD SPC MCD 241610 NCZ000-SCZ000-241715- MESOSCALE DISCUSSION 0154 NWS STORM PREDICTION CENTER NORMAN OK 1010 AM CST FRI FEB 24 2012 AREAS AFFECTED...SC...SRN NC CONCERNING...TORNADO WATCH 35... VALID 241610Z - 241715Z THE SEVERE WEATHER THREAT FOR TORNADO WATCH 35 CONTINUES. NEWD EXTENSION OF PRE-FRONTAL TSTM BAND IS EXPANDING ACROSS SC TOWARD SRN NC. ALONG THIS BAND INDIVIDUAL CELLS ARE INTENSIFYING WITHIN STRONGLY SHEARED ENVIRONMENT. OVER THE LAST HOUR OR SO A FEW NE-SW LINE SEGMENTS HAVE EVOLVED AND THESE SEGMENTS MAY BECOME MORE EFFICIENT WIND PRODUCERS IF THEY CAN MAINTAIN A MORE PERPENDICULAR ORIENTATION TO MEAN FLOW. GIVEN THEIR FAST MOVEMENT THE LEADING ACTIVITY WILL SPREAD EAST OF WW35 INTO PORTIONS OF SERN SC/NC WITHIN THE HOUR. WILL CONTINUE TO MONITOR THIS REGION FOR A POSSIBLE WW. ..DARROW.. 02/24/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MHX...RAH...ILM...CHS...CAE... LAT...LON 34238175 34787925 34867746 33717772 33128150 34238175
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 24, 6:56 AM EST | Mesoscale Discussion | SPC | Cherokee, Clay, Cleveland, Haywood, Henderson, Jackson and 4 more | 94 min |
| Feb 24, 9:05 AM EST | Mesoscale Discussion | SPC | Alexander, Alleghany, Ashe, Avery, Buncombe, Burke and 29 more | 25 min |
| Feb 24, 9:17 AM EST | Tornado Watch | SPC | Alexander, Avery, Buncombe, Burke, Cabarrus, Caldwell and 22 more | 7 hr |
| Feb 24, 12:00 PM EST | Mesoscale Discussion | SPC | Alexander, Alleghany, Ashe, Avery, Buncombe, Burke and 27 more | 60 min |
| Feb 24, 12:43 PM EST | Mesoscale Discussion | SPC | Alamance, Anson, Beaufort, Bertie, Bladen, Brunswick and 51 more | 92 min |
| Feb 24, 1:19 PM EST | Tornado Watch | SPC | Alamance, Anson, Beaufort, Bertie, Bladen, Brunswick and 55 more | 7 hr |
| Feb 24, 1:50 PM EST | Mesoscale Discussion | SPC | Bladen, Brunswick, Columbus, Robeson | 85 min |
| Feb 24, 3:24 PM EST | Mesoscale Discussion | SPC | Alexander, Alleghany, Ashe, Avery, Buncombe, Burke and 27 more | 66 min |
| Feb 24, 4:45 PM EST | Mesoscale Discussion | SPC | Alamance, Beaufort, Bertie, Bladen, Brunswick, Camden and 51 more | 90 min |
| Feb 24, 8:48 AM EST | Tornado Watch | SPC | Abbeville, Aiken, Bamberg, Barnwell, Calhoun, Chester and 17 more | 7 hr |
| Feb 24, 10:49 AM EST | Mesoscale Discussion | SPC | Aiken | 56 min |
| Feb 24, 12:04 PM EST | Tornado Watch | SPC | Allendale, Beaufort, Berkeley, Charleston, Colleton, Dorchester and 2 more | 7 hr |
| Feb 24, 4:11 PM EST | Mesoscale Discussion | SPC | Allendale, Beaufort, Berkeley, Charleston, Colleton, Dorchester and 2 more | 64 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.