Alert archive / North Carolina / Mesoscale Discussions in 2011
Mesoscale Discussion 792
The Storm Prediction Center issued this mesoscale discussion at May 14, 2011, 7:32 PM EDT for 43 counties in North Carolina; 5 counties in South Carolina; 18 counties in Virginia. It was in force for 58 min.
The area
The outline as issued.
The facts
- Issued
- May 14, 2011, 7:32 PM EDT (23:32 UTC)
- Expired
- May 14, 2011, 8:30 PM EDT
- In force
- 58 min
- Issued by
- the Storm Prediction Center
All 66 counties
Beaufort County, NC, Bertie County, NC, Bladen County, NC, Brunswick County, NC, Camden County, NC, Chowan County, NC, Columbus County, NC, Craven County, NC, Cumberland County, NC, Currituck County, NC, Duplin County, NC, Edgecombe County, NC, Franklin County, NC, Gates County, NC, Greene County, NC, Halifax County, NC, Harnett County, NC, Hertford County, NC, Hoke County, NC, Johnston County, NC, Jones County, NC, Lee County, NC, Lenoir County, NC, Martin County, NC, Nash County, NC, New Hanover County, NC, Northampton County, NC, Onslow County, NC, Pamlico County, NC, Pasquotank County, NC, Pender County, NC, Perquimans County, NC, Pitt County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Tyrrell County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Washington County, NC, Wayne County, NC, Wilson County, NC, Darlington County, SC, Dillon County, SC, Florence County, SC, Marion County, SC, Marlboro County, SC, Brunswick County, VA, Chesterfield County, VA, City of Chesapeake, VA, City of Colonial Heights, VA, City of Emporia, VA, City of Franklin, VA, City of Hopewell, VA, City of Petersburg, VA, City of Portsmouth, VA, City of Suffolk, VA, Dinwiddie County, VA, Greensville County, VA, Henrico County, VA, Isle of Wight County, VA, Prince George County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA
The radar
The Raleigh/Durham radar (KRAX), 98 km from the middle of the area, began a volume at 23:35 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
Newport, NC (KMHX), launched 12:00Z, 11.5 hours before the alert went out and 117 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
- 618 J/kg
- Mixed-layer CIN
- -114 J/kg
- Mixed-layer LCL
- 824 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 85 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
373
ACUS11 KWNS 142333
SWOMCD
SPC MCD 142332
NCZ000-VAZ000-SCZ000-150030-
MESOSCALE DISCUSSION 0792
NWS STORM PREDICTION CENTER NORMAN OK
0632 PM CDT SAT MAY 14 2011
AREAS AFFECTED...NERN SC THROUGH ERN NC AND SERN VA
CONCERNING...SEVERE THUNDERSTORM WATCH 302...
VALID 142332Z - 150030Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 302
CONTINUES.
WHILE WW EXPIRES AT 00Z...THOUGH AN HOUR OR TWO EXTENSION IN TIME IS
POSSIBLE.
STORM OUTFLOWS HAVE CONTINUED TO GRADUALLY STABILIZE THE AIR MASS
ACROSS THE WW...EXCEPT FOR FAR ERN NC AND EXTREME SERN VA.
STRONGEST CLUSTER OF STORMS WERE LOCATED BETWEEN ORF AND RIC...BUT
THESE STORMS SHOULD GRADUALLY WEAKEN AS THEY SHIFT NWD ACROSS A WARM
FRONT IN SRN VA...AND THE BOUNDARY LAYER CONTINUES STABILIZING FROM
STORM OUTFLOWS. UNTIL THAT TIME...THESE STORMS MAY PRODUCE BRIEF
WIND DAMAGE.
OTHER STORMS WERE LOCATED IN PORTIONS OF SRN NC AND FAR NERN
SC...BUT THE AIR MASS IN THIS AREA WAS STABILIZED FROM EARLIER
CONVECTION AND SHOULD REMAIN MOSTLY NON-SEVERE.
..IMY.. 05/14/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...AKQ...MHX...RAH...ILM...CAE...
LAT...LON 33907777 33948027 37597771 37527744 36947627 36537589
35607619 33907777SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 13, 9:00 PM EDT | Mesoscale Discussion | SPC | Alamance, Anson, Cabarrus, Chatham, Davidson, Davie and 14 more | 30 min |
| May 14, 1:02 PM EDT | Mesoscale Discussion | SPC | Beaufort, Bertie, Bladen, Camden, Chowan, Columbus and 23 more | 118 min |
| May 14, 1:44 PM EDT | Severe Thunderstorm Watch | SPC | Beaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 35 more | 8 hr |
| May 14, 4:21 PM EDT | Mesoscale Discussion | SPC | Beaufort, Bertie, Bladen, Chowan, Columbus, Craven and 31 more | 84 min |
| May 14, 4:30 PM EDT | Mesoscale Discussion | SPC | Abbeville, Aiken, Allendale, Bamberg, Barnwell, Calhoun and 10 more | 30 min |
| May 14, 4:41 PM EDT | Severe Thunderstorm Watch | SPC | Aiken, Allendale, Bamberg, Barnwell, Beaufort, Berkeley and 10 more | 4 hr |
| May 14, 6:44 PM EDT | Mesoscale Discussion | SPC | Allendale, Bamberg, Barnwell, Beaufort, Berkeley, Charleston and 7 more | 61 min |
Nearby
Mesoscale Discussions in North Carolina, 2011Mesoscale Discussions in Virginia, 2011Mesoscale Discussions in South Carolina, 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.