Alert archive / North Carolina / Mesoscale Discussions in 2004
Mesoscale Discussion 2148
The Storm Prediction Center issued this mesoscale discussion at Aug 29, 2004, 9:13 PM EDT for 24 counties in North Carolina; 5 counties in South Carolina. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- Aug 29, 2004, 9:13 PM EDT (01:13 UTC)
- Expired
- Aug 29, 2004, 10:45 PM EDT
- In force
- 92 min
- Issued by
- the Storm Prediction Center
All 29 counties
Bladen County, NC, Brunswick County, NC, Columbus County, NC, Craven County, NC, Cumberland County, NC, Duplin County, NC, Franklin County, NC, Greene County, NC, Harnett County, NC, Hoke County, NC, Johnston County, NC, Jones County, NC, Lee County, NC, Lenoir County, NC, Nash County, NC, New Hanover County, NC, Onslow County, NC, Pender County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Wake County, NC, Wayne County, NC, Wilson County, NC, Chesterfield County, SC, Dillon County, SC, Horry County, SC, Marion County, SC, Marlboro County, SC
The radar
The Wilmington radar (KLTX), 55 km from the middle of the area, began a volume at 01:14 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, 1.2 hours before the alert went out and 152 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.
- Mixed-layer CAPE
- 1120 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 742 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 126 m²/s²
- 0-3 km storm-relative helicity
- 143 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 3.7
The text
As transmitted, in the capitals the NWS used until 2016.
132 ACUS11 KWNS 300115 SWOMCD SPC MCD 300113 NCZ000-SCZ000-300245- MESOSCALE DISCUSSION 2148 NWS STORM PREDICTION CENTER NORMAN OK 0813 PM CDT SUN AUG 29 2004 AREAS AFFECTED...ERN NC CONCERNING...TORNADO WATCH 796... VALID 300113Z - 300245Z MARGINAL TORNADO POTENTIAL WILL REMAIN THROUGH REMAINDER OF TONIGHT AND SPREAD NEWD ACROSS NERN NC. HOWEVER...THREAT SHOULD CONTINUE TO DIMINISH SUCH THAT WW CAN BE ALLOWED TO EXPIRE WITHOUT ADDITIONAL ISSUANCE. PARTIAL SPIRAL BAND NOW EVIDENT FROM OFFSHORE ONSLOW COUNTY NWWD TOWARD JOHNSTON COUNTY SHOULD CONTINUE TO BE PRIMARY CONVECTIVE FOCUS AWAY FROM CIRCULATION CORE...THROUGH AT LEAST 04Z. VERTICAL SHEAR REMAINS FAVORABLE OVER NERN QUADRANT OF CIRCULATION OF GASTON -- I.E. 0-1 KM SRH 100-250 J/KG BASED ON MHX RAOB AND VWP FROM RDU/MHX REGIONS. MAIN AREA OF INTEREST REMAINS SFC TROUGH/WIND SHIFT LINE AND PRESSURE FALL AXIS NEAR POB...LHZ...60 E DAN LINE...PARTICULARLY IF ANY DISCRETE STORMS OR MINI-SUPERCELLS EMBEDDED WITHIN SPIRAL BAND MOVE THROUGH THAT CORRIDOR. THIS SHOULD SERVE AS AXIS OF ANY REMAINING TORNADO PROBABILITIES. MAIN NEGATIVE FACTOR IS WEAKENING SFC-BASED INSTABILITY AND RESULTANT DECREASE COVERAGE/INTENSITY OF DISCRETE CONVECTION ACROSS FAVORABLY SHEARED SECTOR OF GASTON. ..EDWARDS.. 08/30/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MHX...RAH...ILM...CAE... 33237865 34638017 36337828 34967676
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 30, 12:07 PM EDT | Mesoscale Discussion | SPC | Camden, Chowan, Currituck, Gates, Hertford, Pasquotank and 3 more | 113 min |
| Aug 30, 12:50 PM EDT | Tornado Watch | SPC | Currituck | 7 hr |
Nearby
Mesoscale Discussions in North Carolina, 2004Mesoscale Discussions in South Carolina, 2004Every 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.