Alert archive / North Carolina / Mesoscale Discussions in 2011

Mesoscale Discussion 355

April 4, 201114 counties in North Carolina; 8 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2011, 9:32 PM EDT for 14 counties in North Carolina; 8 counties in South Carolina. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued
Apr 4, 2011, 9:32 PM EDT (01:32 UTC)
Expired
Apr 4, 2011, 10:30 PM EDT
In force
58 min
Issued by
the Storm Prediction Center
All 22 counties

Alexander County, NC, Buncombe County, NC, Burke County, NC, Catawba County, NC, Cleveland County, NC, Gaston County, NC, Henderson County, NC, Iredell County, NC, Jackson County, NC, Lincoln County, NC, McDowell County, NC, Polk County, NC, Rutherford County, NC, Transylvania County, NC, Abbeville County, SC, Anderson County, SC, Cherokee County, SC, Greenville County, SC, Laurens County, SC, Oconee County, SC, Pickens County, SC, Spartanburg County, SC

The radar

The Greer radar (KGSP), 31 km from the middle of the area, began a volume at 01:32 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 1.5 hours before the alert went out and 229 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, Greensboro/Hi Pt, NC at 00:00Z on 2011-04-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Greensboro/Hi Pt, NC at 00:00Z on 2011-04-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 144 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2364 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
144 m²/s²
0-3 km storm-relative helicity
291 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.

604 
ACUS11 KWNS 050133
SWOMCD
SPC MCD 050132
NCZ000-SCZ000-GAZ000-050230-

MESOSCALE DISCUSSION 0355
NWS STORM PREDICTION CENTER NORMAN OK
0832 PM CDT MON APR 04 2011

AREAS AFFECTED...WRN NC AND UPSTATE SC

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY

VALID 050132Z - 050230Z

WW WILL BE NEEDED SOON...GREATER THAN 90 PERCENT CHANCE OF ISSUANCE
FOR PARTS OF WRN NC AND UPSTATE SC.  MAIN THREATS...DAMAGING WIND
AND HAIL.

SQUALL LINE OVER NCNTRL GA IS EXTRAPOLATED TO THE GA/NC/SC BORDER
REGION 0245-03Z.  BOUNDARY LAYER DOWNSTREAM WAS MOISTENING RAPIDLY
AND REMAINING WARM/BUOYANT AND WILL LIKELY SUPPORT THE SQUALL LINE
ACROSS THE APPALACHIAN CREST INTO WRN NC/SC THROUGH LATE EVENING.

..RACY.. 04/05/2011

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

ATTN...WFO...RNK...GSP...

LAT...LON   34548324 35018342 35468318 35878169 36088113 35858078
            35348090 34738158 34188247 34548324

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 4, 9:45 PM EDTSevere Thunderstorm WatchSPCAlexander, Avery, Buncombe, Burke, Cabarrus, Caldwell and 22 more5 hr
Apr 5, 12:21 AM EDTMesoscale DiscussionSPCAlamance, Anson, Chatham, Cumberland, Harnett, Hoke and 7 more84 min
Apr 5, 12:36 AM EDTSevere Thunderstorm WatchSPCAlleghany, Caswell, Rockingham, Stokes, Surry, Wilkes and 1 more111 min
Apr 5, 12:48 AM EDTTornado WatchSPCAlamance, Anson, Bladen, Chatham, Cumberland, Davidson and 27 more5 hr
Apr 5, 2:13 AM EDTMesoscale DiscussionSPCForsyth, Rockingham, Stokes, Surry, Yadkin32 min
Apr 5, 2:18 AM EDTTornado WatchSPCBertie, Camden, Caswell, Chowan, Currituck, Gates and 5 more8 hr
Apr 5, 2:24 AM EDTMesoscale DiscussionSPCCabarrus, Mecklenburg, Rowan66 min
Apr 5, 3:34 AM EDTMesoscale DiscussionSPCAlamance, Beaufort, Bertie, Bladen, Brunswick, Camden and 49 more116 min
Apr 5, 4:00 AM EDTTornado WatchSPCBeaufort, Bladen, Brunswick, Carteret, Columbus, Craven and 15 more6 hr
Apr 5, 7:08 AM EDTMesoscale DiscussionSPCBeaufort, Brunswick, Carteret, Craven, Currituck, Dare and 10 more2 hr
Apr 5, 10:15 AM EDTMesoscale DiscussionSPCBeaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 26 more90 min
Apr 4, 10:05 PM EDTMesoscale DiscussionSPCEdgefield55 min
Apr 5, 2:41 AM EDTTornado WatchSPCAllendale, Beaufort, Berkeley, Charleston, Colleton, Dorchester and 2 more6 hr
Apr 5, 2:55 AM EDTMesoscale DiscussionSPCAllendale, Bamberg, Beaufort, Berkeley, Charleston, Colleton and 3 more2 hr
Apr 5, 5:39 AM EDTMesoscale DiscussionSPCBeaufort, Charleston2 hr

Nearby

Mesoscale Discussions in North Carolina, 2011Mesoscale Discussions in South Carolina, 2011Every 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.