Alert archive / North Carolina / Mesoscale Discussions in 2011
Mesoscale Discussion 787
The Storm Prediction Center issued this mesoscale discussion at May 14, 2011, 4:21 PM EDT for 37 counties in North Carolina; Dillon County, Marion County, Marlboro County, South Carolina; 9 counties in Virginia. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- May 14, 2011, 4:21 PM EDT (20:21 UTC)
- Expired
- May 14, 2011, 5:45 PM EDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
All 49 counties
Beaufort County, NC, Bertie County, NC, Bladen County, NC, Chowan County, NC, Columbus County, NC, Craven County, NC, Cumberland 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, Lenoir County, NC, Martin County, NC, Nash 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, Wake County, NC, Warren County, NC, Washington County, NC, Wayne County, NC, Wilson County, NC, Dillon County, SC, Marion County, SC, Marlboro County, SC, Brunswick County, VA, City of Emporia, VA, City of Franklin, VA, City of Suffolk, VA, Dinwiddie County, VA, Greensville County, VA, Isle of Wight County, VA, Southampton County, VA, Sussex County, VA
The radar
The Raleigh/Durham radar (KRAX), 47 km from the middle of the area, began a volume at 20:21 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, 8.4 hours before the alert went out and 130 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.
642
ACUS11 KWNS 142021
SWOMCD
SPC MCD 142021
NCZ000-VAZ000-SCZ000-142145-
MESOSCALE DISCUSSION 0787
NWS STORM PREDICTION CENTER NORMAN OK
0321 PM CDT SAT MAY 14 2011
AREAS AFFECTED...NERN SC THROUGH ERN NC AND SERN VA
CONCERNING...SEVERE THUNDERSTORM WATCH 302...
VALID 142021Z - 142145Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 302
CONTINUES.
THREAT FOR ISOLATED STRONG WIND GUSTS AND HAIL WILL PERSIST NEXT FEW
HOURS WITH STORMS DEVELOPING THROUGH THE ERN CAROLINAS INTO SERN VA.
LATEST OBJECTIVE ANALYSIS INDICATES A RESERVOIR OF 2000-2500 J/KG
MLCAPE REMAINING FROM ERN NC INTO SERN VA. SMALL CLUSTER OF STORMS
HAS EVOLVED INTO A FORWARD PROPAGATING BOWING SEGMENT OVER E-CNTRL
NC MOVING NWD. THESE STORMS WILL CONTINUE TO POSE A THREAT FOR
STRONG TO LOCALLY DAMAGING WIND GUSTS. ADDITIONAL STORMS MIGHT ALSO
DEVELOP AND INTENSIFY FARTHER NW AS OUTFLOW FROM THIS ACTIVITY
MERGES WITH AN OUTFLOW BOUNDARY OVER WAKE COUNTY. OTHERWISE CLUSTERS
OF STORMS IN NERN SC AND INTO SERN VA WILL ALSO POSE A THREAT FOR
LOCALLY STRONG WIND GUSTS AND HAIL.
..DIAL.. 05/14/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...AKQ...MHX...RAH...ILM...
LAT...LON 34337996 35757873 36877804 37207746 36877643 35837595
35057647 34137830 33777948 34337996SPC 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, 7:32 PM EDT | Mesoscale Discussion | SPC | Beaufort, Bertie, Bladen, Brunswick, Camden, Chowan and 37 more | 58 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.