Alert archive / North Carolina / Mesoscale Discussions in 2012
Mesoscale Discussion 808
The Storm Prediction Center issued this mesoscale discussion at May 14, 2012, 2:30 PM EDT for 13 counties in North Carolina; 7 counties in South Carolina. It was in force for 60 min.
The area
The outline as issued.
The facts
- Issued
- May 14, 2012, 2:30 PM EDT (18:30 UTC)
- Expired
- May 14, 2012, 3:30 PM EDT
- In force
- 60 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
Counties Bladen County, NC, Brunswick County, NC, Columbus County, NC, Cumberland County, NC, Duplin County, NC, Jones County, NC, Lenoir County, NC, New Hanover County, NC, Onslow County, NC, Pender County, NC, Robeson County, NC, Sampson County, NC, Wayne County, NC, Berkeley County, SC, Charleston County, SC, Dillon County, SC, Georgetown County, SC, Horry County, SC, Marion County, SC, Williamsburg County, SC
The radar
The Wilmington radar (KLTX), 60 km from the middle of the area, began a volume at 18:30 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
Charleston AFB, SC (KCHS), launched 12:00Z, 6.5 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.
- Mixed-layer CAPE
- 518 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 722 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 96 m²/s²
- 0-3 km storm-relative helicity
- 143 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
101 ACUS11 KWNS 141831 SWOMCD SPC MCD 141830 NCZ000-SCZ000-141930- MESOSCALE DISCUSSION 0808 NWS STORM PREDICTION CENTER NORMAN OK 0130 PM CDT MON MAY 14 2012 AREAS AFFECTED...NC/SC COASTAL PLAIN CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY VALID 141830Z - 141930Z PROBABILITY OF WATCH ISSUANCE...20 PERCENT SUMMARY...ISOLD DMGG WIND RISK WILL MOVE EWD AS THE BROKEN TSTM LINE ADVANCES TOWARDS THE COAST THIS AFTERNOON. DISCUSSION...RADAR/SURFACE ANALYSIS PLACES A BROKEN LINE OF TSTMS NEAR THE I-95 CORRIDOR WITH THE AIRMASS CONTINUING TO WARM/DESTABILIZE AS TEMPS WARM TO AROUND 80 DEG F AHEAD OF IT. LOW LEVEL LAPSE RATES IN TURN HAVE STEEPENED CONSIDERABLY /7-8 DEG C PER KM/ IN THE 0-3 KM LAYER -- BECOMING MORE FAVORABLE FOR ISOLD POCKETS OF STRONG TO LOWER-END SEVERE WIND GUSTS. KCLX AND KCAE VAD SHOW 0-6 KM SHEAR RANGING FROM 25-35 KTS...SUPPORTIVE PRIMARILY OF MULTICELLS/BOWING SEGMENTS WITH OCCASIONAL TRANSIENT SUPERCELL STRUCTURE...AS THE STORM CONGLOMERATION PUSHES TOWARDS THE COAST AT 25 KTS. ..SMITH/HART.. 05/14/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MHX...RAH...ILM...CHS... LAT...LON 32588054 35457870 35417715 34507734 32578008 32588054
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 14, 6:14 PM EDT | Mesoscale Discussion | SPC | Alexander, Burke, Cabarrus, Caldwell, Catawba, Cleveland and 13 more | 61 min |
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.