Alert archive / North Carolina / Mesoscale Discussions in 2012

Mesoscale Discussion 723

May 5, 201216 counties in North Carolina; 4 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at May 5, 2012, 8:45 PM EDT for 16 counties in North Carolina; 4 counties in South Carolina. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
May 5, 2012, 8:45 PM EDT (00:45 UTC)
Expired
May 5, 2012, 9:45 PM EDT
In force
60 min
Issued by
the Storm Prediction Center

Counties Beaufort County, NC, Bladen County, NC, Brunswick County, NC, Carteret County, NC, Columbus County, NC, Craven County, NC, Duplin County, NC, Greene County, NC, Jones County, NC, Lenoir County, NC, New Hanover County, NC, Onslow County, NC, Pamlico County, NC, Pender County, NC, Pitt County, NC, Sampson County, NC, Georgetown County, SC, Horry County, SC, Marion County, SC, Williamsburg County, SC

The radar

The Wilmington radar (KLTX), 34 km from the middle of the area, began a volume at 00:48 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, 0.8 hours before the alert went out and 137 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-pSkew-T log-p diagram, Newport, NC at 00:00Z on 2012-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1527 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Newport, NC at 00:00Z on 2012-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -4 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1527 J/kg
Mixed-layer CIN
-52 J/kg
Mixed-layer LCL
1082 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
-4 m²/s²
0-3 km storm-relative helicity
50 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.5

Open this sounding in Storm Lab

The text

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

390 
ACUS11 KWNS 060046
SWOMCD
SPC MCD 060045
NCZ000-SCZ000-060145-

MESOSCALE DISCUSSION 0723
NWS STORM PREDICTION CENTER NORMAN OK
0745 PM CDT SAT MAY 05 2012

AREAS AFFECTED...ERN NC/SC

CONCERNING...SEVERE THUNDERSTORM WATCH 249...

VALID 060045Z - 060145Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 249
CONTINUES.

SUMMARY...ISOLATED SEVERE THUNDERSTORMS MAY PERSIST OVER THE NEXT
HOUR OR TWO...BEFORE QUICKLY WEAKENING AFTER SUNSET. THE WW IS
EXPECTED TO EXPIRE AT 02Z.

DISCUSSION...A SEMI ORGANIZED CLUSTER OF THUNDERSTORMS HAS DEVELOPED
OVER NC. ALTHOUGH A BRIEF THREAT OF DMGG WINDS REMAINS
POSSIBLE...THE DOWNSTREAM MHX SOUNDING SHOWS A 950 MB WARM
LAYER...AND FURTHER LOW LEVEL STABILIZATION WILL OCCUR AS DIURNAL
COOLING BEGINS. AS A RESULT...EXPECT THAT STRONG TO SEVERE STORMS
PRIMARILY CAPABLE OF HAIL WILL CONTINUE TO WEAKEN...AND THE WW WILL
BE ALLOWED TO EXPIRE AT 02Z.

..HURLBUT.. 05/06/2012

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

ATTN...WFO...MHX...RAH...ILM...CAE...

LAT...LON   32957891 33588010 34167952 35827728 35537644 34697641
            32957891

Nearby

Mesoscale Discussions in North Carolina, 2012Mesoscale Discussions in South Carolina, 2012Every mesoscale discussion in 2012

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.