Alert archive / North Carolina / Mesoscale Discussions in 2011
Mesoscale Discussion 2145
The Storm Prediction Center issued this mesoscale discussion at Sep 6, 2011, 4:41 PM EDT for 52 counties in North Carolina; 9 counties in South Carolina; 13 counties in Virginia. It was in force for 64 min.
The area
The outline as issued.
The facts
- Issued
- Sep 6, 2011, 4:41 PM EDT (20:41 UTC)
- Expired
- Sep 6, 2011, 5:45 PM EDT
- In force
- 64 min
- Issued by
- the Storm Prediction Center
All 74 counties
Alamance County, NC, Anson County, NC, Beaufort County, NC, Bertie County, NC, Bladen County, NC, Brunswick County, NC, Caswell County, NC, Chatham County, NC, Chowan County, NC, Columbus County, NC, Craven County, NC, Cumberland County, NC, Duplin County, NC, Durham County, NC, Edgecombe County, NC, Franklin County, NC, Gates County, NC, Granville County, NC, Greene County, NC, Guilford 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, Montgomery County, NC, Moore County, NC, Nash County, NC, New Hanover County, NC, Northampton County, NC, Onslow County, NC, Orange County, NC, Pamlico County, NC, Pender County, NC, Person County, NC, Pitt County, NC, Randolph County, NC, Richmond County, NC, Robeson County, NC, Rockingham County, NC, Sampson County, NC, Scotland County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Washington County, NC, Wayne County, NC, Wilson County, NC, Chesterfield County, SC, Darlington County, SC, Dillon County, SC, Florence County, SC, Georgetown County, SC, Horry County, SC, Marion County, SC, Marlboro County, SC, Williamsburg County, SC, Brunswick County, VA, City of Emporia, VA, City of Franklin, VA, City of Newport News, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Suffolk, VA, Greensville County, VA, Isle of Wight County, VA, Mecklenburg County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA
The radar
The Raleigh/Durham radar (KRAX), 46 km from the middle of the area, began a volume at 20:43 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, 8.7 hours before the alert went out and 132 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
- 2357 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 472 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 3.3
The text
As transmitted, in the capitals the NWS used until 2016.
947
ACUS11 KWNS 062042
SWOMCD
SPC MCD 062041
NCZ000-VAZ000-SCZ000-062145-
MESOSCALE DISCUSSION 2145
NWS STORM PREDICTION CENTER NORMAN OK
0341 PM CDT TUE SEP 06 2011
AREAS AFFECTED...NERN SC/CENTRAL AND ERN NC/SERN VA
CONCERNING...TORNADO WATCH 847...848...
VALID 062041Z - 062145Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 847...848...CONTINUES.
THE SEVERE WEATHER THREAT /PRIMARILY STRONG WIND GUSTS...LOCALLY
EXCEEDING SEVERE LEVELS/ PERSISTS ACROSS WW 848 AND THE FAR ERN
EXTENT OF WW 847.
MID AFTERNOON SURFACE ANALYSES MAINTAINED AN AREA OF LOW PRESSURE
OVER FAR NERN TN WITH THE TRAILING COLD FRONT HAVING ADVANCED EWD
THROUGH WRN NC AND MUCH OF CENTRAL SC BY 2030Z. THE DELINEATING
BOUNDARY FOR THE NRN EXTENT OF THE SEVERE WEATHER THREAT CONTINUES
TO BE THE BAROCLINIC ZONE WHICH EXTENDED WSWWD FROM FAR SERN VA
THROUGH FAR NORTH CENTRAL NC TO NWRN NC WHERE THIS BOUNDARY
INTERSECTED THE EWD ADVANCING COLD FRONT. THE ERN EXTENT OF
STRONGER MERIDIONAL FLOW IS JUXTAPOSED WITH THE WRN EXTENT OF
STRONGER INSTABILITY SUCH THAT ORGANIZED LINE SEGMENTS CONTINUE TO
DEVELOP. ALTHOUGH STORM MOTION IS TO THE NNE AROUND 40 KT...
STRONGER WIND GUSTS HAVE BEEN LIMITED TO REACHING THE SURFACE...WITH
THIS LIKELY DUE TO RELATIVELY WEAKER LOW LEVEL LAPSE RATES.
EFFECTIVE SRH OF 200-300 M2/S2 REMAINS SUFFICIENT FOR LOW LEVEL
STORM ROTATION...BUT AGAIN THE WEAKER LOW LEVEL LAPSE RATES MAY TEND
TO LIMIT THIS THREAT AS WELL.
..PETERS.. 09/06/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...AKQ...MHX...RAH...ILM...RNK...CHS...CAE...
LAT...LON 32947886 33528005 34718020 35838014 36327992 36717908
36827818 36987741 37267660 37177627 36437644 35347651
34707681 34557721 33607771 32947886SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 5, 8:36 PM EDT | Mesoscale Discussion | SPC | Anson, Cumberland, Hoke, Montgomery, Moore, Richmond and 3 more | 84 min |
| Sep 5, 11:47 PM EDT | Mesoscale Discussion | SPC | Stokes, Surry | 88 min |
| Sep 6, 3:30 AM EDT | Mesoscale Discussion | SPC | Rockingham, Stokes | 60 min |
| Sep 6, 4:36 AM EDT | Mesoscale Discussion | SPC | Alamance, Anson, Cabarrus, Caswell, Chatham, Davidson and 22 more | 84 min |
| Sep 6, 5:17 AM EDT | Tornado Watch | SPC | Alamance, Alleghany, Anson, Bladen, Brunswick, Caswell and 43 more | 9 hr |
| Sep 6, 8:35 AM EDT | Mesoscale Discussion | SPC | Alamance, Anson, Bladen, Brunswick, Cabarrus, Catawba and 42 more | 85 min |
| Sep 6, 9:51 AM EDT | Tornado Watch | SPC | Alexander, Avery, Burke, Cabarrus, Caldwell, Catawba and 13 more | 6 hr |
| Sep 6, 12:41 PM EDT | Mesoscale Discussion | SPC | Alamance, Alleghany, Anson, Beaufort, Bertie, Bladen and 55 more | 64 min |
| Sep 6, 1:32 PM EDT | Tornado Watch | SPC | Alamance, Anson, Beaufort, Bertie, Bladen, Brunswick and 48 more | 7 hr |
| Sep 6, 7:33 PM EDT | Mesoscale Discussion | SPC | Beaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 38 more | 117 min |
| Sep 6, 10:11 AM EDT | Tornado Watch | SPC | Allendale, Bamberg, Barnwell, Beaufort, Berkeley, Calhoun and 15 more | 7 hr |
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.