Alert archive / North Carolina / Mesoscale Discussions in 2003

Mesoscale Discussion 598

April 26, 200340 counties in North Carolina; 6 counties in South Carolina; 10 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2003, 4:11 PM EDT for 40 counties in North Carolina; 6 counties in South Carolina; 10 counties in Virginia. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Apr 26, 2003, 4:11 PM EDT (20:11 UTC)
Expired: Apr 26, 2003, 5:15 PM EDT
In force: 64 min
Issued by: the Storm Prediction Center

All 56 counties

Beaufort County, NC, Bertie County, NC, Bladen County, NC, Brunswick County, NC, Camden County, NC, Chowan County, NC, Columbus County, NC, Craven County, NC, Cumberland County, NC, Currituck County, NC, Dare County, NC, Duplin County, NC, Edgecombe County, NC, Gates County, NC, Greene County, NC, Halifax County, NC, Harnett County, NC, Hertford County, NC, Hoke County, NC, Hyde County, NC, Johnston County, NC, Jones County, NC, Lenoir County, NC, Martin County, NC, Nash County, NC, New Hanover County, NC, Northampton County, NC, Onslow County, NC, Pamlico County, NC, Pasquotank County, NC, Pender County, NC, Perquimans County, NC, Pitt County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Tyrrell County, NC, Washington County, NC, Wayne County, NC, Wilson County, NC, Darlington County, SC, Dillon County, SC, Florence County, SC, Horry County, SC, Marion County, SC, Marlboro County, SC, City of Chesapeake, VA, City of Franklin, VA, City of Hampton, VA, City of Newport News, VA, City of Norfolk, VA, City of Portsmouth, VA, City of Suffolk, VA, City of Virginia Beach, VA, Isle of Wight County, VA, Southampton County, VA

The radar

The Raleigh/Durham radar (KRAX), 88 km from the middle of the area, began a volume at 20:10 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, 8.2 hours before the alert went out and 101 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: 54 J/kg
Mixed-layer CIN: -207 J/kg
Mixed-layer LCL: 947 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 74 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
Apr 26, 10:03 AM EDT	Mesoscale Discussion	SPC	Alamance, Anson, Beaufort, Bertie, Bladen, Brunswick and 54 more	117 min
Apr 26, 11:30 AM EDT	Severe Thunderstorm Watch	SPC	Beaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 35 more	6 hr
Apr 26, 1:45 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Bladen, Brunswick, Camden, Chowan and 34 more	2 hr
Apr 26, 2:04 PM EDT	Mesoscale Discussion	SPC	Alexander, Anson, Avery, Burke, Cabarrus, Caldwell and 20 more	116 min

Nearby

Mesoscale Discussions in North Carolina, 2003 Mesoscale Discussions in Virginia, 2003 Mesoscale Discussions in South Carolina, 2003 Every mesoscale discussion in 2003

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.