Alert archive / North Carolina / Mesoscale Discussions in 2011

Mesoscale Discussion 365

April 5, 201116 counties in North Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2011, 7:08 AM EDT for 16 counties in North Carolina. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 5, 2011, 7:08 AM EDT (11:08 UTC)
Expired: Apr 5, 2011, 9:15 AM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Beaufort County, NC, Brunswick County, NC, Carteret County, NC, Craven County, NC, Currituck County, NC, Dare County, NC, Duplin County, NC, Hyde County, NC, Jones County, NC, Lenoir County, NC, New Hanover County, NC, Onslow County, NC, Pamlico County, NC, Pender County, NC, Tyrrell County, NC, Washington County, NC

The radar

The Morehead City radar (KMHX), 24 km from the middle of the area, began a volume at 11:11 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, 11.1 hours before the alert went out and 24 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: 331 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 486 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 190 m²/s²
0-3 km storm-relative helicity: 229 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.

230 
ACUS11 KWNS 051109
SWOMCD
SPC MCD 051108
NCZ000-SCZ000-051315-

MESOSCALE DISCUSSION 0365
NWS STORM PREDICTION CENTER NORMAN OK
0608 AM CDT TUE APR 05 2011

AREAS AFFECTED...PORTIONS ERN NC...EXTREME ERN SC.

CONCERNING...TORNADO WATCH 103...

VALID 051108Z - 051315Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 103 CONTINUES.

WW MAY BE CLEARED BEHIND PRIMARY SQUALL LINE.  SVR THREAT OTHERWISE
CONTINUES UNTIL ACTIVITY MOVES OFFSHORE.

QUASI-LINEAR MCS WITH HISTORY OF DAMAGING WIND AND MEASURED SVR
GUSTS IS FCST TO MOVE OFFSHORE THROUGH 14Z...LAST AREAS AFFECTED
BEING OUTER BANKS.  PRIMARY SVR THREAT WILL REMAIN DAMAGING
GUSTS...ALTHOUGH A BRIEF QLCS TORNADO OR TWO STILL CANNOT BE RULED
OUT.  FCST SOUNDINGS INDICATE VERY WEAK INSTABILITY INLAND...WITH
LAPSE RATES ONLY SLIGHTLY ABOVE MOIST-ADIABATIC...BUT WITH BUOYANCY
INCREASING IN PROXIMITY TO RELATIVELY HIGH-THETAE WARM-SECTOR AIR
OVER OUTER BANKS.  MUCAPE UP TO 500 J/KG SHOULD OCCUR OVER ERN
FRINGES OF WW AREA...AMIDST FAVORABLE DEEP-LAYER SHEAR.  MORE
DISCRETE CELLS ARE EVIDENT IN REFLECTIVITY AND IR IMAGERY OFFSHORE
NC..IN GULF-STREAM CONVERGENCE ZONE THAT COMMONLY DEVELOPS BETWEEN
ATLANTIC HIGH AND STG SYNOPTIC SYSTEMS OVER ERN CONUS.  THIS
CONVERGENCE ZONE IS TRANSLATING SLOWLY EWD...AND MOST OF THIS
ACTIVITY SHOULD REMAIN E OF OUTER BANKS.  HOWEVER...AN ISOLATED
SUPERCELL WITH ATTENDANT WIND/TORNADO POTENTIAL MAY MOVE ACROSS THIS
REGION BETWEEN MARINE CONVERGENCE ZONE AND PRIMARY QLCS AS MESOBETA
SCALE CONVERGENCE INCREASES.

..EDWARDS.. 04/05/2011

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

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

LAT...LON   36547586 36247576 35667543 35327548 35147552 35217561
            35117591 34817637 34507656 34617657 34707687 34467742
            34197779 33977791 33787796 33877807 33727885 35067821
            35847682 36547586

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 4, 9:32 PM EDT	Mesoscale Discussion	SPC	Alexander, Buncombe, Burke, Catawba, Cleveland, Gaston and 8 more	58 min
Apr 4, 9:45 PM EDT	Severe Thunderstorm Watch	SPC	Alexander, Avery, Buncombe, Burke, Cabarrus, Caldwell and 22 more	5 hr
Apr 5, 12:21 AM EDT	Mesoscale Discussion	SPC	Alamance, Anson, Chatham, Cumberland, Harnett, Hoke and 7 more	84 min
Apr 5, 12:36 AM EDT	Severe Thunderstorm Watch	SPC	Alleghany, Caswell, Rockingham, Stokes, Surry, Wilkes and 1 more	111 min
Apr 5, 12:48 AM EDT	Tornado Watch	SPC	Alamance, Anson, Bladen, Chatham, Cumberland, Davidson and 27 more	5 hr
Apr 5, 2:13 AM EDT	Mesoscale Discussion	SPC	Forsyth, Rockingham, Stokes, Surry, Yadkin	32 min
Apr 5, 2:18 AM EDT	Tornado Watch	SPC	Bertie, Camden, Caswell, Chowan, Currituck, Gates and 5 more	8 hr
Apr 5, 2:24 AM EDT	Mesoscale Discussion	SPC	Cabarrus, Mecklenburg, Rowan	66 min
Apr 5, 3:34 AM EDT	Mesoscale Discussion	SPC	Alamance, Beaufort, Bertie, Bladen, Brunswick, Camden and 49 more	116 min
Apr 5, 4:00 AM EDT	Tornado Watch	SPC	Beaufort, Bladen, Brunswick, Carteret, Columbus, Craven and 15 more	6 hr
Apr 5, 10:15 AM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 26 more	90 min

Nearby

Mesoscale Discussions in North Carolina, 2011 Every mesoscale discussion in 2011

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.