Alert archive / North Carolina / Mesoscale Discussions in 2014

Mesoscale Discussion 140

February 21, 201428 counties in North Carolina; 4 counties in South Carolina; 16 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Feb 21, 2014, 8:57 AM EST for 28 counties in North Carolina; 4 counties in South Carolina; 16 counties in Virginia. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued
Feb 21, 2014, 8:57 AM EST (13:57 UTC)
Expired
Feb 21, 2014, 10:00 AM EST
In force
63 min
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 48 counties

Alamance County, NC, Bladen County, NC, Caswell County, NC, Chatham County, NC, Columbus County, NC, Cumberland County, NC, Duplin County, NC, Durham County, NC, Franklin County, NC, Granville County, NC, Greene County, NC, Harnett County, NC, Hoke County, NC, Johnston County, NC, Lee County, NC, Moore County, NC, Nash County, NC, Orange County, NC, Person County, NC, Richmond County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Wayne County, NC, Wilson County, NC, Dillon County, SC, Horry County, SC, Marion County, SC, Marlboro County, SC, Amelia County, VA, Appomattox County, VA, Brunswick County, VA, Buckingham County, VA, Campbell County, VA, Charlotte County, VA, City of Danville, VA, Cumberland County, VA, Dinwiddie County, VA, Goochland County, VA, Halifax County, VA, Lunenburg County, VA, Mecklenburg County, VA, Nottoway County, VA, Powhatan County, VA, Prince Edward County, VA

The radar

The Raleigh/Durham radar (KRAX), 50 km from the middle of the area, began a volume at 14:00 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, 2.0 hours before the alert went out and 86 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 2014-02-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 24 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 12:00Z on 2014-02-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 272 square meters per square second.1939587897Sfc1 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
24 J/kg
Mixed-layer CIN
-52 J/kg
Mixed-layer LCL
679 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
272 m²/s²
0-3 km storm-relative helicity
272 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Feb 20, 10:29 PM ESTMesoscale DiscussionSPCCherokee, Clay, Graham, Swain61 min
Feb 20, 10:47 PM ESTTornado WatchSPCCherokee, Clay, Graham, Haywood, Jackson, Macon and 2 more6 hr
Feb 21, 3:11 AM ESTMesoscale DiscussionSPCAlexander, Alleghany, Ashe, Avery, Buncombe, Burke and 14 more94 min
Feb 21, 10:02 AM ESTTornado WatchSPCAlamance, Bladen, Brunswick, Chatham, Columbus, Cumberland and 24 more6 hr
Feb 21, 10:39 AM ESTTornado WatchSPCBertie, Camden, Chowan, Currituck, Gates, Hertford and 3 more5 hr
Feb 21, 11:05 AM ESTMesoscale DiscussionSPCBeaufort, Bertie, Bladen, Carteret, Chowan, Columbus and 27 more55 min
Feb 21, 12:15 PM ESTTornado WatchSPCBeaufort, Carteret, Craven, Dare, Duplin, Greene and 9 more5 hr
Feb 21, 1:14 PM ESTMesoscale DiscussionSPCBeaufort, Bertie, Brunswick, Camden, Carteret, Chowan and 19 more61 min
Feb 21, 6:39 AM ESTSevere Thunderstorm WatchSPCAbbeville, Aiken, Allendale, Anderson, Bamberg, Barnwell and 30 more9 hr
Feb 21, 8:17 AM ESTMesoscale DiscussionSPCAiken, Allendale, Bamberg, Barnwell, Beaufort, Calhoun and 12 more118 min
Feb 21, 12:43 PM ESTMesoscale DiscussionSPCAbbeville, Aiken, Allendale, Anderson, Bamberg, Barnwell and 20 more62 min
Feb 21, 12:16 PM ESTMesoscale DiscussionSPCAccomack, Charles City, Essex, Gloucester, Isle of Wight, James City and 24 more89 min

Nearby

Mesoscale Discussions in North Carolina, 2014Mesoscale Discussions in Virginia, 2014Mesoscale Discussions in South Carolina, 2014Every mesoscale discussion in 2014

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.