Alert archive / North Carolina / Mesoscale Discussions in 2008

Mesoscale Discussion 754

April 28, 200816 counties in North Carolina; 6 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Apr 28, 2008, 6:45 PM EDT for 16 counties in North Carolina; 6 counties in Virginia. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Apr 28, 2008, 6:45 PM EDT (22:45 UTC)
Expired: Apr 28, 2008, 7:45 PM EDT
In force: 60 min
Issued by: the Storm Prediction Center

All 22 counties

Beaufort County, NC, Bertie County, NC, Camden County, NC, Chowan County, NC, Currituck County, NC, Dare County, NC, Gates County, NC, Hertford County, NC, Hyde County, NC, Martin County, NC, Pamlico County, NC, Pasquotank County, NC, Perquimans County, NC, Pitt County, NC, Tyrrell County, NC, Washington County, NC, City of Chesapeake, VA, City of Franklin, VA, City of Norfolk, VA, City of Portsmouth, VA, City of Suffolk, VA, City of Virginia Beach, VA

The radar

The Morehead City radar (KMHX), 131 km from the middle of the area, began a volume at 22:47 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, 10.8 hours before the alert went out and 130 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: 120 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 835 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 113 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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 28, 12:50 PM EDT	Mesoscale Discussion	SPC	Alamance, Bertie, Caswell, Chatham, Chowan, Durham and 19 more	55 min
Apr 28, 3:16 PM EDT	Tornado Watch	SPC	Beaufort, Bertie, Camden, Chowan, Currituck, Dare and 15 more	5 hr
Apr 28, 4:28 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Camden, Chowan, Craven, Currituck and 18 more	92 min

Nearby

Mesoscale Discussions in North Carolina, 2008 Mesoscale Discussions in Virginia, 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.