Alert archive / North Carolina / Mesoscale Discussions in 2008

Mesoscale Discussion 899

May 11, 200826 counties in North Carolina; Horry County, South Carolina; 6 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at May 11, 2008, 10:34 PM EDT for 26 counties in North Carolina; Horry County, South Carolina; 6 counties in Virginia. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: May 11, 2008, 10:34 PM EDT (02:34 UTC)
Expired: May 11, 2008, 11:30 PM EDT
In force: 56 min
Issued by: the Storm Prediction Center

All 33 counties

Beaufort County, NC, Bertie County, NC, Brunswick County, NC, Camden County, NC, Carteret County, NC, Chowan County, NC, Craven County, NC, Currituck County, NC, Dare County, NC, Duplin County, NC, Gates County, NC, Greene County, NC, Hertford County, NC, Hyde County, NC, Jones County, NC, Lenoir County, NC, Martin County, NC, New Hanover County, NC, Onslow County, NC, Pamlico County, NC, Pasquotank County, NC, Pender County, NC, Perquimans County, NC, Pitt County, NC, Tyrrell County, NC, Washington County, NC, Horry County, SC, City of Chesapeake, VA, City of Norfolk, VA, City of Portsmouth, VA, City of Suffolk, VA, City of Virginia Beach, VA, Isle of Wight County, VA

The radar

The Morehead City radar (KMHX), 55 km from the middle of the area, began a volume at 02:37 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 00:00Z, 2.6 hours before the alert went out and 54 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: 628 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 1382 m above ground
0-6 km bulk shear: 81 kt
0-1 km storm-relative helicity: 328 m²/s²
0-3 km storm-relative helicity: 369 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 8.3

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, 2008 Mesoscale Discussions in Virginia, 2008 Mesoscale Discussions in South Carolina, 2008 Every mesoscale discussion in 2008

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.