Alert archive / North Carolina / Mesoscale Discussions in 2011

Mesoscale Discussion 2142

September 6, 201128 counties in North Carolina; 10 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Sep 6, 2011, 4:36 AM EDT for 28 counties in North Carolina; 10 counties in South Carolina. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Sep 6, 2011, 4:36 AM EDT (08:36 UTC)
Expired
Sep 6, 2011, 6:00 AM EDT
In force
84 min
Issued by
the Storm Prediction Center
All 38 counties

Alamance County, NC, Anson County, NC, Cabarrus County, NC, Caswell County, NC, Chatham County, NC, Davidson County, NC, Durham County, NC, Forsyth County, NC, Granville County, NC, Guilford County, NC, Harnett County, NC, Hoke County, NC, Lee County, NC, Mecklenburg County, NC, Montgomery County, NC, Moore County, NC, Orange County, NC, Person County, NC, Randolph County, NC, Richmond County, NC, Robeson County, NC, Rockingham County, NC, Rowan County, NC, Scotland County, NC, Stanly County, NC, Union County, NC, Vance County, NC, Wake County, NC, Chester County, SC, Chesterfield County, SC, Darlington County, SC, Dillon County, SC, Fairfield County, SC, Kershaw County, SC, Lancaster County, SC, Lee County, SC, Marlboro County, SC, Sumter County, SC

The radar

The Raleigh/Durham radar (KRAX), 107 km from the middle of the area, began a volume at 08:38 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 00:00Z, 8.6 hours before the alert went out and 79 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 00:00Z on 2011-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1522 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2011-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 209 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
1522 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
698 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
209 m²/s²
0-3 km storm-relative helicity
245 m²/s²
Significant tornado parameter
2.1
Supercell composite
9.5

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, 5:17 AM EDTTornado WatchSPCAlamance, Alleghany, Anson, Bladen, Brunswick, Caswell and 43 more9 hr
Sep 6, 8:35 AM EDTMesoscale DiscussionSPCAlamance, Anson, Bladen, Brunswick, Cabarrus, Catawba and 42 more85 min
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, 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.