Alert archive / North Carolina / Mesoscale Discussions in 2008

Mesoscale Discussion 2455

December 11, 200855 counties in North Carolina; 21 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Dec 11, 2008, 3:57 PM EST for 55 counties in North Carolina; 21 counties in Virginia. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Dec 11, 2008, 3:57 PM EST (20:57 UTC)
Expired
Dec 11, 2008, 6:00 PM EST
In force
2 hr
Issued by
the Storm Prediction Center
All 76 counties

Beaufort County, NC, Bertie County, NC, Bladen County, NC, Brunswick County, NC, Cabarrus County, NC, Camden County, NC, Carteret County, NC, Chatham County, NC, Chowan County, NC, Columbus County, NC, Craven County, NC, Cumberland County, NC, Currituck County, NC, Dare County, NC, Davidson 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, Hyde 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, Pamlico County, NC, Pasquotank County, NC, Pender County, NC, Perquimans County, NC, Pitt County, NC, Randolph County, NC, Richmond County, NC, Robeson County, NC, Rowan County, NC, Sampson County, NC, Scotland County, NC, Stanly County, NC, Tyrrell County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Washington County, NC, Wayne County, NC, Wilson County, NC, Brunswick County, VA, City of Chesapeake, VA, City of Emporia, VA, City of Franklin, VA, City of Hampton, VA, City of Newport News, VA, City of Norfolk, VA, City of Petersburg, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Suffolk, VA, City of Virginia Beach, VA, City of Williamsburg, VA, Dinwiddie County, VA, Greensville County, VA, Isle of Wight County, VA, Prince George County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA, York County, VA

The radar

The Raleigh/Durham radar (KRAX), 65 km from the middle of the area, began a volume at 20:57 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, 9.0 hours before the alert went out and 112 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, Newport, NC at 12:00Z on 2008-12-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1360 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, Newport, NC at 12:00Z on 2008-12-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 169 square meters per square second.193958Sfc1 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
1360 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
440 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
169 m²/s²
0-3 km storm-relative helicity
194 m²/s²
Significant tornado parameter
1.1
Supercell composite
8.0

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
Dec 11, 10:01 AM ESTMesoscale DiscussionSPCAlamance, Alexander, Anson, Avery, Bladen, Brunswick and 56 more119 min
Dec 11, 11:00 AM ESTTornado WatchSPCAnson, Bladen, Brunswick, Cabarrus, Chatham, Columbus and 23 more8 hr
Dec 11, 11:30 AM ESTMesoscale DiscussionSPCBeaufort, Bertie, Carteret, Chowan, Craven, Dare and 10 more30 min
Dec 11, 11:43 AM ESTTornado WatchSPCBeaufort, Bertie, Camden, Carteret, Chowan, Craven and 25 more9 hr
Dec 11, 1:28 PM ESTMesoscale DiscussionSPCAnson, Beaufort, Bertie, Bladen, Brunswick, Camden and 45 more92 min
Dec 11, 3:17 PM ESTTornado WatchSPCCurrituck6 hr
Dec 11, 3:02 PM ESTMesoscale DiscussionSPCBrunswick, Greensville, Isle of Wight, Mecklenburg, Northampton, Southampton and 13 more58 min

Nearby

Mesoscale Discussions in North Carolina, 2008Mesoscale Discussions in Virginia, 2008Every mesoscale discussion in 2008

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.