Alert archive / North Carolina / Mesoscale Discussions in 2014

Mesoscale Discussion 137

February 21, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Feb 21, 2014, 3:11 AM EST for 4 states. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued
Feb 21, 2014, 3:11 AM EST (08:11 UTC)
Expired
Feb 21, 2014, 4:45 AM EST
In force
94 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 35 counties

Alexander County, NC, Alleghany County, NC, Ashe County, NC, Avery County, NC, Buncombe County, NC, Burke County, NC, Caldwell County, NC, Catawba County, NC, Cleveland County, NC, Henderson County, NC, Iredell County, NC, Lincoln County, NC, McDowell County, NC, Mitchell County, NC, Polk County, NC, Rutherford County, NC, Transylvania County, NC, Watauga County, NC, Wilkes County, NC, Yancey County, NC, Anderson County, SC, Cherokee County, SC, Greenville County, SC, Pickens County, SC, Spartanburg County, SC, Carter County, TN, Johnson County, TN, Unicoi County, TN, Bland County, VA, City of Bristol, VA, Grayson County, VA, Smyth County, VA, Tazewell County, VA, Washington County, VA, Wythe County, VA

The radar

The Greer radar (KGSP), 122 km from the middle of the area, began a volume at 08:12 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

Roanoke, VA (KRNK), launched 00:00Z, 8.2 hours before the alert went out and 254 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, Roanoke, VA at 00:00Z on 2014-02-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Roanoke, VA at 00:00Z on 2014-02-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 364 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
873 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
364 m²/s²
0-3 km storm-relative helicity
440 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, 8:57 AM ESTMesoscale DiscussionSPCAlamance, Bladen, Caswell, Chatham, Columbus, Cumberland and 22 more63 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 20, 7:49 PM ESTTornado WatchSPCBedford, Cannon, Cheatham, Clay, Coffee, Cumberland and 26 more6 hr
Feb 20, 9:01 PM ESTMesoscale DiscussionSPCBedford, Bledsoe, Cannon, Clay, Coffee, Cumberland and 33 more89 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.