Alert archive / North Carolina / Mesoscale Discussions in 2011

Mesoscale Discussion 782

May 13, 201120 counties in North Carolina; 4 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at May 13, 2011, 9:00 PM EDT for 20 counties in North Carolina; 4 counties in South Carolina. It was in force for 30 min.

The area

The outline as issued.

The facts

Issued: May 13, 2011, 9:00 PM EDT (01:00 UTC)
Expired: May 13, 2011, 9:30 PM EDT
In force: 30 min
Issued by: the Storm Prediction Center

All 24 counties

Alamance County, NC, Anson County, NC, Cabarrus County, NC, Chatham County, NC, Davidson County, NC, Davie County, NC, Forsyth County, NC, Gaston County, NC, Guilford County, NC, Iredell County, NC, Mecklenburg County, NC, Montgomery County, NC, Moore County, NC, Randolph County, NC, Richmond County, NC, Rockingham County, NC, Rowan County, NC, Stanly County, NC, Stokes County, NC, Union County, NC, Chester County, SC, Chesterfield County, SC, Lancaster County, SC, York County, SC

The radar

The Raleigh/Durham radar (KRAX), 169 km from the middle of the area, began a volume at 01:01 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

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 1.0 hours before the alert went out and 87 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1797 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 700 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 41 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.

Issued	Product	Office	Counties	Lasted
May 14, 1:02 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Bladen, Camden, Chowan, Columbus and 23 more	118 min
May 14, 1:44 PM EDT	Severe Thunderstorm Watch	SPC	Beaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 35 more	8 hr
May 14, 4:21 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Bladen, Chowan, Columbus, Craven and 31 more	84 min
May 14, 7:32 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Bladen, Brunswick, Camden, Chowan and 37 more	58 min
May 14, 4:30 PM EDT	Mesoscale Discussion	SPC	Abbeville, Aiken, Allendale, Bamberg, Barnwell, Calhoun and 10 more	30 min
May 14, 4:41 PM EDT	Severe Thunderstorm Watch	SPC	Aiken, Allendale, Bamberg, Barnwell, Beaufort, Berkeley and 10 more	4 hr
May 14, 6:44 PM EDT	Mesoscale Discussion	SPC	Allendale, Bamberg, Barnwell, Beaufort, Berkeley, Charleston and 7 more	61 min

Nearby

Mesoscale Discussions in North Carolina, 2011 Mesoscale Discussions in South Carolina, 2011 Every mesoscale discussion in 2011

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.