Alert archive / South Carolina / Mesoscale Discussions in 2011
Mesoscale Discussion 659
The Storm Prediction Center issued this mesoscale discussion at Apr 28, 2011, 8:05 AM EDT for 11 counties in Georgia; 21 counties in North Carolina; 25 counties in South Carolina. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Apr 28, 2011, 8:05 AM EDT (12:05 UTC)
- Expired
- Apr 28, 2011, 9:30 AM EDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
All 57 counties
Burke County, GA, Candler County, GA, Dodge County, GA, Emanuel County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Laurens County, GA, Richmond County, GA, Screven County, GA, Treutlen County, GA, Anson County, NC, Chatham County, NC, Cumberland County, NC, Durham County, NC, Edgecombe County, NC, Franklin County, NC, Granville County, NC, Harnett County, NC, Hoke County, NC, Johnston County, NC, Lee County, NC, Montgomery County, NC, Moore County, NC, Nash County, NC, Orange County, NC, Richmond County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Wake County, NC, Wilson County, NC, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Berkeley County, SC, Calhoun County, SC, Chesterfield County, SC, Clarendon County, SC, Colleton County, SC, Darlington County, SC, Dillon County, SC, Dorchester County, SC, Fairfield County, SC, Florence County, SC, Hampton County, SC, Kershaw County, SC, Lancaster 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), 64 km from the middle of the area, began a volume at 12:08 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, 0.1 hours before the alert went out and 134 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
- 1847 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 685 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 221 m²/s²
- 0-3 km storm-relative helicity
- 251 m²/s²
- Significant tornado parameter
- 1.8
- Supercell composite
- 10.6
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 27, 8:55 PM EDT | Mesoscale Discussion | SPC | Chattooga, Walker | 65 min |
| Apr 28, 12:09 AM EDT | Mesoscale Discussion | SPC | Banks, Barrow, Bartow, Bibb, Butts, Carroll and 65 more | 36 min |
| Apr 28, 12:56 AM EDT | Tornado Watch | SPC | Baldwin, Banks, Barrow, Bibb, Bleckley, Burke and 80 more | 4 hr |
| Apr 28, 2:22 AM EDT | Mesoscale Discussion | SPC | Baker, Calhoun, Clay, Early, Miller, Quitman and 2 more | 83 min |
| Apr 28, 3:30 AM EDT | Mesoscale Discussion | SPC | Baldwin, Bibb, Bleckley, Burke, Chattahoochee, Columbia and 30 more | 90 min |
| Apr 28, 4:30 AM EDT | Tornado Watch | SPC | Baldwin, Bibb, Bleckley, Bulloch, Burke, Candler and 37 more | 10 hr |
| Apr 28, 8:48 AM EDT | Tornado Watch | SPC | Bryan, Bulloch, Candler, Chatham, Effingham, Evans and 6 more | 7 hr |
| Apr 28, 9:47 AM EDT | Severe Thunderstorm Watch | SPC | Appling, Atkinson, Bacon, Brantley, Camden, Charlton and 8 more | 9 hr |
| Apr 28, 11:22 AM EDT | Mesoscale Discussion | SPC | Bulloch, Burke, Candler, Chatham, Effingham, Emanuel and 2 more | 53 min |
| Apr 28, 12:19 PM EDT | Mesoscale Discussion | SPC | Appling, Bacon, Brantley, Camden, Charlton, Clinch and 10 more | 56 min |
| Apr 27, 10:12 PM EDT | Mesoscale Discussion | SPC | Alleghany, Ashe, Forsyth, Rockingham, Stokes, Surry and 3 more | 63 min |
| Apr 28, 12:27 AM EDT | Mesoscale Discussion | SPC | Alamance, Alleghany, Ashe, Caswell, Davidson, Davie and 11 more | 63 min |
| Apr 28, 12:41 AM EDT | Tornado Watch | SPC | Alamance, Alleghany, Ashe, Caswell, Davidson, Forsyth and 10 more | 7 hr |
| Apr 28, 7:38 AM EDT | Tornado Watch | SPC | Bertie, Camden, Caswell, Chowan, Currituck, Gates and 9 more | 7 hr |
| Apr 28, 2:41 PM EDT | Tornado Watch | SPC | Beaufort, Bertie, Camden, Carteret, Chowan, Craven and 21 more | 6 hr |
| Apr 28, 3:19 PM EDT | Tornado Watch | SPC | Bladen, Brunswick, Columbus, New Hanover, Pender | 4 hr |
| Apr 28, 6:33 PM EDT | Mesoscale Discussion | SPC | Beaufort, Bertie, Camden, Carteret, Chowan, Craven and 20 more | 57 min |
Nearby
Mesoscale Discussions in South Carolina, 2011Mesoscale Discussions in North Carolina, 2011Mesoscale Discussions in Georgia, 2011Every 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.