Alert archive / North Carolina / Mesoscale Discussions in 2014

Mesoscale Discussion 18

January 11, 201428 counties in North Carolina; 12 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Jan 11, 2014, 11:12 AM EST for 28 counties in North Carolina; 12 counties in South Carolina. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued
Jan 11, 2014, 11:12 AM EST (16:12 UTC)
Expired
Jan 11, 2014, 12:15 PM EST
In force
63 min
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 40 counties

Alamance County, NC, Anson County, NC, Caswell County, NC, Chatham County, NC, Cumberland County, NC, Durham County, NC, Franklin County, NC, Granville County, NC, Guilford County, NC, Halifax County, NC, Harnett County, NC, Hoke County, NC, Johnston County, NC, Lee County, NC, Montgomery County, NC, Moore County, NC, Nash County, NC, Orange County, NC, Person County, NC, Randolph County, NC, Richmond County, NC, Robeson County, NC, Scotland County, NC, Stanly County, NC, Union County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Calhoun County, SC, Chesterfield County, SC, Darlington County, SC, Dillon County, SC, Kershaw County, SC, Lancaster County, SC, Lee County, SC, Lexington County, SC, Marlboro County, SC, Orangeburg County, SC, Richland County, SC, Sumter County, SC

The radar

The Raleigh/Durham radar (KRAX), 90 km from the middle of the area, began a volume at 16:13 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, 4.2 hours before the alert went out and 100 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 2014-01-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 35 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 2014-01-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 361 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
35 J/kg
Mixed-layer CIN
-173 J/kg
Mixed-layer LCL
419 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
361 m²/s²
0-3 km storm-relative helicity
406 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

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
Jan 11, 9:22 AM ESTMesoscale DiscussionSPCCleveland, Henderson, Polk23 min
Jan 11, 9:30 AM ESTSevere Thunderstorm WatchSPCCabarrus, Cleveland, Gaston, Lincoln, Mecklenburg, Polk and 2 more6 hr
Jan 11, 11:50 AM ESTTornado WatchSPCAlamance, Anson, Bladen, Chatham, Cumberland, Durham and 24 more6 hr
Jan 11, 2:04 PM ESTMesoscale DiscussionSPCBeaufort, Bladen, Brunswick, Carteret, Chatham, Columbus and 34 more56 min
Jan 11, 2:13 PM ESTTornado WatchSPCBeaufort, Brunswick, Carteret, Columbus, Craven, Dare and 13 more5 hr
Jan 11, 2:30 PM ESTTornado WatchSPCBertie, Camden, Chowan, Currituck, Gates, Hertford and 3 more4 hr
Jan 11, 4:14 PM ESTMesoscale DiscussionSPCBertie, Camden, Chowan, Currituck, Edgecombe, Gates and 6 more61 min
Jan 11, 4:37 PM ESTMesoscale DiscussionSPCBeaufort, Brunswick, Carteret, Columbus, Craven, Hyde and 5 more53 min
Jan 11, 12:17 PM ESTMesoscale DiscussionSPCAllendale, Hampton58 min
Jan 11, 1:51 PM ESTTornado WatchSPCAllendale, Beaufort, Berkeley, Charleston, Colleton, Dorchester and 2 more3 hr
Jan 11, 3:35 PM ESTMesoscale DiscussionSPCBeaufort, Berkeley, Charleston, Colleton, Dorchester, Hampton and 1 more55 min

Nearby

Mesoscale Discussions in North Carolina, 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.