Alert archive / North Carolina / Mesoscale Discussions in 2012
Mesoscale Discussion 1767
The Storm Prediction Center issued this mesoscale discussion at Aug 15, 2012, 4:34 PM EDT for 21 counties in North Carolina. It was in force for 86 min.
The area
The outline as issued.
The facts
- Issued
- Aug 15, 2012, 4:34 PM EDT (20:34 UTC)
- Expired
- Aug 15, 2012, 6:00 PM EDT
- In force
- 86 min
- Issued by
- the Storm Prediction Center
All 21 counties
Beaufort County, NC, Bladen County, NC, Camden County, NC, Carteret County, NC, Chowan County, NC, Columbus 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, Pasquotank County, NC, Pender County, NC, Perquimans County, NC, Tyrrell County, NC, Washington County, NC
The nearest sounding before it
Newport, NC (KMHX), launched 12:00Z, 8.6 hours before the alert went out and 61 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
- 2363 J/kg
- Mixed-layer CIN
- -22 J/kg
- Mixed-layer LCL
- 852 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 80 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.7
The text
As transmitted, in the capitals the NWS used until 2016.
569
ACUS11 KWNS 152035
SWOMCD
SPC MCD 152034
NCZ000-VAZ000-152200-
MESOSCALE DISCUSSION 1767
NWS STORM PREDICTION CENTER NORMAN OK
0334 PM CDT WED AUG 15 2012
AREAS AFFECTED...ERN NC
CONCERNING...SEVERE THUNDERSTORM WATCH 580...
VALID 152034Z - 152200Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 580
CONTINUES.
SUMMARY...A CONSOLIDATING CLUSTER OR LINE OF STORMS IS EXPECTED TO
SPREAD ACROSS NORTH CAROLINA COASTAL AREAS...INCLUDING THE OUTER
BANKS... DURING THE NEXT COUPLE OF HOURS.
DISCUSSION...INCREASING BOUNDARY LAYER CONVERGENCE ALONG THE AXIS OF
STRONGEST PRE-FRONTAL HEATING ACROSS THE NORTH CAROLINA COASTAL
PLAIN NOW APPEARS TO BE CONTRIBUTING TO AN EVOLVING LINE OF STORMS.
IN THE PRESENCE OF HIGH MOISTURE CONTENT AND STRONG DEEP LAYER SHEAR
ASSOCIATED WITH AN EASTWARD ADVANCING BELT OF 30-40 KT WEST
SOUTHWESTERLY 500 MB FLOW...FURTHER CONVECTIVE GROWTH/EXPANSION AND
ORGANIZATION APPEARS POSSIBLE ACROSS COASTAL AREAS AND THE OUTER
BANKS THROUGH 22-23Z. THIS LIKELY WILL BE ACCOMPANIED BY FREQUENT
CLOUD TO GROUND LIGHTNING...HEAVY RAINFALL AND THE POTENTIAL FOR ONE
OR TWO DOWNBURSTS WITH POTENTIALLY DAMAGING SURFACE GUSTS.
..KERR.. 08/15/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...AKQ...MHX...RAH...ILM...
LAT...LON 34677868 34897825 35797701 36357653 36897570 36127513
34987559 34057788 34197865 34677868SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 15, 2:01 PM EDT | Mesoscale Discussion | SPC | Alamance, Anson, Beaufort, Bertie, Cabarrus, Camden and 38 more | 89 min |
| Aug 15, 2:34 PM EDT | Severe Thunderstorm Watch | SPC | Beaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 46 more | 6 hr |
Nearby
Mesoscale Discussions in North 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.