Alert archive / North Carolina / Mesoscale Discussions in 2004

Mesoscale Discussion 352

April 13, 200429 counties in North Carolina; 13 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2004, 3:19 PM EDT for 29 counties in North Carolina; 13 counties in Virginia. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: Apr 13, 2004, 3:19 PM EDT (19:19 UTC)
Expired: Apr 13, 2004, 4:15 PM EDT
In force: 56 min
Issued by: the Storm Prediction Center

All 42 counties

Beaufort County, NC, Bertie County, NC, Camden County, NC, Carteret County, NC, Chowan County, NC, Craven County, NC, Currituck County, NC, Dare County, NC, Duplin County, NC, Edgecombe County, NC, Gates County, NC, Greene County, NC, Halifax County, NC, Hertford County, NC, Hyde County, NC, Jones County, NC, Lenoir County, NC, Martin County, NC, Nash County, NC, Northampton County, NC, Onslow County, NC, Pamlico County, NC, Pasquotank County, NC, Perquimans County, NC, Pitt County, NC, Tyrrell County, NC, Washington County, NC, Wayne County, NC, Wilson County, NC, 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, City of Williamsburg, VA, Isle of Wight County, VA, James City County, VA, Southampton County, VA, Surry County, VA

The radar

The Morehead City radar (KMHX), 114 km from the middle of the area, began a volume at 19:21 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, 7.3 hours before the alert went out and 114 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: 1252 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 594 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 159 m²/s²
0-3 km storm-relative helicity: 180 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 5.1

Open this sounding in Storm Lab

The text

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

000 
ACUS11 KWNS 131920
SWOMCD
SPC MCD 131919 
NCZ000-VAZ000-132015-

MESOSCALE DISCUSSION 0352
NWS STORM PREDICTION CENTER NORMAN OK
0219 PM CDT TUE APR 13 2004

AREAS AFFECTED...ERN NC / SERN VA

CONCERNING...TORNADO WATCH 74...

VALID 131919Z - 132015Z

RAIN / THUNDERSTORMS CONTINUE MOVING NNEWD ACROSS THE NERN HALF OF
WW.  SEVERE WEATHER THREAT CONTINUES FROM SERN VA INTO NERN NC AND
THE OUTER BANKS.  CURRENT WW IS SCHEDULED TO EXPIRE AT 13/20Z...AND
NEW WW APPEARS UNLIKELY ATTM.

LATEST RADAR / SATELLITE IMAGERY INDICATES DRY SLOT SPREADING NEWD
ACROSS THE CAROLINAS ATTM...WHILE DEWPOINTS ACROSS ERN NC AND SERN
VA REMAIN IN THE 60S TO LOW 70S.  STRONGEST STORMS REMAIN ACROSS FAR
ERN NC AND THE OUTER BANKS / COASTAL WATERS ATTM...WHERE 1000 J/KG
MEAN-LAYER CAPE AND VERY STRONG DEEP-LAYER WIND FIELD REMAINS. THIS
AREA OF THUNDERSTORMS AND ASSOCIATED THREAT FOR DAMAGING WINDS /
ISOLATED TORNADOES WILL CONTINUE SHIFTING NNEWD WITH TIME...AND
SHOULD BE PRIMARILY OFF THE NERN NC / SERN VA COAST BY 13/21Z.

IT APPEARS HOWEVER THAT A LIMITED POTENTIAL FOR STORM REDEVELOPMENT
EXISTS ACROSS ERN NC ALONG N-S SURFACE BOUNDARY / WIND SHIFT MOVING
ACROSS THE RDU AREA ATTM.  THIS AREA IS BENEATH LEADING EDGE OF DRY
SLOT...AND VISIBLE IMAGERY INDICATES CLEARING AHEAD OF THIS LINE
ACROSS ERN NC. WITH LIMITED HEATING / DESTABILIZATION THEREFORE
EXPECTED ACROSS THIS REGION...ISOLATED STORM REDEVELOPMENT CANNOT BE
RULED OUT.  WITH STRONG DEEP-LAYER WIND FIELD REMAINING OVER THE
AREA...A LIMITED AREAL / TEMPORAL SEVERE THREAT WOULD EXIST ASSUMING
STORM DEVELOPMENT.  HOWEVER...IT APPEARS ATTM THAT NEW WW WILL NOT
BE REQUIRED AS THREAT SHOULD REMAIN LIMITED.

..GOSS.. 04/13/2004

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...AKQ...MHX...RAH...ILM...

36807586 35307543 34627651 34277725 35207862 37487678

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 13, 9:37 AM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Bladen, Camden, Carteret, Chowan and 37 more	83 min
Apr 13, 10:35 AM EDT	Tornado Watch	SPC	Beaufort, Bertie, Camden, Chowan, Craven, Currituck and 20 more	5 hr
Apr 13, 1:23 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Camden, Carteret, Chowan, Craven and 23 more	97 min

Nearby

Mesoscale Discussions in North Carolina, 2004 Mesoscale Discussions in Virginia, 2004 Every mesoscale discussion in 2004

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.