Alert archive / North Carolina / Mesoscale Discussions in 2011

Mesoscale Discussion 2143

September 6, 201148 counties in North Carolina; 10 counties in South Carolina; Southampton County, Virginia

The Storm Prediction Center issued this mesoscale discussion at Sep 6, 2011, 8:35 AM EDT for 48 counties in North Carolina; 10 counties in South Carolina; Southampton County, Virginia. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
Sep 6, 2011, 8:35 AM EDT (12:35 UTC)
Expired
Sep 6, 2011, 10:00 AM EDT
In force
85 min
Issued by
the Storm Prediction Center
All 59 counties

Alamance County, NC, Anson County, NC, Bladen County, NC, Brunswick County, NC, Cabarrus County, NC, Catawba County, NC, Chatham County, NC, Columbus County, NC, Cumberland County, NC, Davidson County, NC, Davie County, NC, Duplin County, NC, Durham County, NC, Edgecombe County, NC, Franklin County, NC, Gaston County, NC, Granville County, NC, Greene County, NC, Guilford County, NC, Halifax County, NC, Harnett County, NC, Hoke County, NC, Iredell County, NC, Johnston County, NC, Lee County, NC, Lenoir County, NC, Lincoln County, NC, Mecklenburg County, NC, Montgomery County, NC, Moore County, NC, Nash County, NC, New Hanover County, NC, Northampton County, NC, Orange County, NC, Pender County, NC, Randolph County, NC, Richmond County, NC, Robeson County, NC, Rowan County, NC, Sampson County, NC, Scotland County, NC, Stanly County, NC, Union County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Wayne County, NC, Wilson County, NC, Chesterfield County, SC, Darlington County, SC, Dillon County, SC, Florence County, SC, Horry County, SC, Lancaster County, SC, Lee County, SC, Marion County, SC, Marlboro County, SC, Williamsburg County, SC, Southampton County, VA

The radar

The Raleigh/Durham radar (KRAX), 72 km from the middle of the area, began a volume at 12:36 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 0.6 hours before the alert went out and 118 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.

Skew-T log-pSkew-T log-p diagram, Greensboro/Hi Pt, NC at 12:00Z on 2011-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1434 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 12:00Z on 2011-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 246 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1434 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
515 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
246 m²/s²
0-3 km storm-relative helicity
274 m²/s²
Significant tornado parameter
1.9
Supercell composite
11.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 5, 8:36 PM EDTMesoscale DiscussionSPCAnson, Cumberland, Hoke, Montgomery, Moore, Richmond and 3 more84 min
Sep 5, 11:47 PM EDTMesoscale DiscussionSPCStokes, Surry88 min
Sep 6, 3:30 AM EDTMesoscale DiscussionSPCRockingham, Stokes60 min
Sep 6, 4:36 AM EDTMesoscale DiscussionSPCAlamance, Anson, Cabarrus, Caswell, Chatham, Davidson and 22 more84 min
Sep 6, 5:17 AM EDTTornado WatchSPCAlamance, Alleghany, Anson, Bladen, Brunswick, Caswell and 43 more9 hr
Sep 6, 9:51 AM EDTTornado WatchSPCAlexander, Avery, Burke, Cabarrus, Caldwell, Catawba and 13 more6 hr
Sep 6, 12:41 PM EDTMesoscale DiscussionSPCAlamance, Alleghany, Anson, Beaufort, Bertie, Bladen and 55 more64 min
Sep 6, 1:32 PM EDTTornado WatchSPCAlamance, Anson, Beaufort, Bertie, Bladen, Brunswick and 48 more7 hr
Sep 6, 4:41 PM EDTMesoscale DiscussionSPCAlamance, Anson, Beaufort, Bertie, Bladen, Brunswick and 46 more64 min
Sep 6, 7:33 PM EDTMesoscale DiscussionSPCBeaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 38 more117 min
Sep 6, 10:11 AM EDTTornado WatchSPCAllendale, Bamberg, Barnwell, Beaufort, Berkeley, Calhoun and 15 more7 hr

Nearby

Mesoscale Discussions in North Carolina, 2011Mesoscale Discussions in South Carolina, 2011Mesoscale Discussions in Virginia, 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.