Alert archive / North Carolina / Mesoscale Discussions in 2012

Mesoscale Discussion 1742

August 11, 201239 counties in North Carolina; 9 counties in South Carolina; 24 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Aug 11, 2012, 1:27 PM EDT for 39 counties in North Carolina; 9 counties in South Carolina; 24 counties in Virginia. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Aug 11, 2012, 1:27 PM EDT (17:27 UTC)
Expired: Aug 11, 2012, 2:30 PM EDT
In force: 63 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 72 counties

Beaufort County, NC, Bertie County, NC, Bladen County, NC, Brunswick County, NC, Chatham County, NC, Chowan County, NC, Columbus County, NC, Craven County, NC, Cumberland County, NC, Duplin County, NC, Durham County, NC, Edgecombe County, NC, Franklin County, NC, Gates County, NC, Granville County, NC, Greene County, NC, Halifax County, NC, Harnett County, NC, Hertford County, NC, Hoke County, NC, Johnston County, NC, Jones County, NC, Lee County, NC, Lenoir County, NC, Martin County, NC, Nash County, NC, New Hanover County, NC, Northampton County, NC, Onslow County, NC, Pender County, NC, Pitt 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, Berkeley County, SC, Clarendon County, SC, Dillon County, SC, Florence County, SC, Georgetown County, SC, Horry County, SC, Marion County, SC, Marlboro County, SC, Williamsburg County, SC, Brunswick County, VA, Charles City County, VA, City of Chesapeake, VA, City of Colonial Heights, VA, City of Emporia, VA, City of Franklin, VA, City of Hampton, VA, City of Hopewell, VA, City of Newport News, VA, City of Norfolk, VA, City of Petersburg, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Suffolk, VA, City of Williamsburg, VA, Dinwiddie County, VA, Greensville County, VA, Isle of Wight County, VA, James City County, VA, Mecklenburg County, VA, Prince George County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA

The radar

The Raleigh/Durham radar (KRAX), 63 km from the middle of the area, began a volume at 17:29 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

Newport, NC (KMHX), launched 12:00Z, 5.5 hours before the alert went out and 137 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: 1450 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 785 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 51 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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Nearby

Mesoscale Discussions in North Carolina, 2012 Mesoscale Discussions in Virginia, 2012 Mesoscale Discussions in South Carolina, 2012 Every mesoscale discussion in 2012

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.