Alert archive / North Carolina / Mesoscale Discussions in 2014

Mesoscale Discussion 1366

July 14, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Jul 14, 2014, 12:50 PM EDT for 4 states. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
Jul 14, 2014, 12:50 PM EDT (16:50 UTC)
Expired
Jul 14, 2014, 2:15 PM EDT
In force
85 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 77 counties

Alamance County, NC, Alexander County, NC, Alleghany County, NC, Ashe County, NC, Avery County, NC, Burke County, NC, Cabarrus County, NC, Caldwell County, NC, Caswell County, NC, Catawba County, NC, Chatham County, NC, Cleveland County, NC, Davidson County, NC, Davie County, NC, Durham County, NC, Forsyth County, NC, Gaston County, NC, Granville County, NC, Guilford County, NC, Iredell County, NC, Lincoln County, NC, McDowell County, NC, Mecklenburg County, NC, Mitchell County, NC, Montgomery County, NC, Orange County, NC, Person County, NC, Randolph County, NC, Rockingham County, NC, Rowan County, NC, Rutherford County, NC, Stanly County, NC, Stokes County, NC, Surry County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Yancey County, NC, Carter County, TN, Johnson County, TN, Amherst County, VA, Appomattox County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Campbell County, VA, Carroll County, VA, Charlotte County, VA, City of Bristol, VA, City of Buena Vista, VA, City of Danville, VA, City of Galax, VA, City of Lynchburg, VA, City of Martinsville, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, Craig County, VA, Floyd County, VA, Franklin County, VA, Giles County, VA, Grayson County, VA, Halifax County, VA, Henry County, VA, Montgomery County, VA, Patrick County, VA, Pittsylvania County, VA, Prince Edward County, VA, Pulaski County, VA, Roanoke County, VA, Russell County, VA, Smyth County, VA, Tazewell County, VA, Washington County, VA, Wythe County, VA, Mercer County, WV, Monroe County, WV

The radar

The Roanoke radar (KFCX), 62 km from the middle of the area, began a volume at 16:49 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

Roanoke, VA (KRNK), launched 12:00Z, 4.8 hours before the alert went out and 94 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 12:00Z on 2014-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 408 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, Roanoke, VA at 12:00Z on 2014-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 square meters per square second.1939Sfc1 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
408 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
766 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
71 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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
Jul 14, 1:10 PM EDTMesoscale DiscussionSPCAnderson, Bedford, Benton, Bledsoe, Campbell, Cannon and 68 more2 hr
Jul 14, 2:22 PM EDTSevere Thunderstorm WatchSPCBedford, Benton, Cannon, Carroll, Cheatham, Chester and 53 more7 hr
Jul 14, 4:57 PM EDTMesoscale DiscussionSPCBedford, Benton, Cannon, Carroll, Cheatham, Chester and 41 more93 min
Jul 14, 6:53 PM EDTMesoscale DiscussionSPCAnderson, Bedford, Bledsoe, Bradley, Cannon, Carroll and 44 more97 min
Jul 13, 8:46 PM EDTMesoscale DiscussionSPCArlington, Fairfax, Loudoun, Prince William, City of Alexandria, City of Fairfax and 3 more89 min
Jul 14, 1:06 PM EDTMesoscale DiscussionSPCAlbemarle, Arlington, Augusta, Caroline, Clarke, Culpeper and 30 more84 min
Jul 14, 1:24 PM EDTSevere Thunderstorm WatchSPCAlbemarle, Arlington, Augusta, Clarke, Culpeper, Fairfax and 28 more8 hr
Jul 14, 4:39 PM EDTMesoscale DiscussionSPCAlbemarle, Arlington, Augusta, Clarke, Culpeper, Fairfax and 28 more96 min
Jul 14, 6:59 PM EDTMesoscale DiscussionSPCCaroline, Essex, Hanover, King and Queen, King William, Lancaster and 5 more61 min

Nearby

Mesoscale Discussions in North Carolina, 2014Mesoscale Discussions in Virginia, 2014Mesoscale Discussions in Tennessee, 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.