Alert archive / North Carolina / Mesoscale Discussions in 2012
Mesoscale Discussion 144
The Storm Prediction Center issued this mesoscale discussion at Feb 23, 2012, 12:25 AM EST for 19 counties in North Carolina. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Feb 23, 2012, 12:25 AM EST (05:25 UTC)
- Expired
- Feb 23, 2012, 2:00 AM EST
- In force
- 95 min
- Issued by
- the Storm Prediction Center
Counties Alamance County, NC, Chatham County, NC, Cumberland County, NC, Durham County, NC, Franklin County, NC, Granville County, NC, Halifax County, NC, Harnett County, NC, Hoke County, NC, Johnston County, NC, Lee County, NC, Montgomery County, NC, Moore County, NC, Nash County, NC, Orange County, NC, Randolph County, NC, Vance County, NC, Wake County, NC, Warren County, NC
The radar
The Raleigh/Durham radar (KRAX), 17 km from the middle of the area, began a volume at 05:28 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
Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 5.4 hours before the alert went out and 121 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
- 8 J/kg
- Mixed-layer CIN
- -51 J/kg
- Mixed-layer LCL
- 1522 m above ground
- 0-6 km bulk shear
- 72 kt
- 0-1 km storm-relative helicity
- 240 m²/s²
- 0-3 km storm-relative helicity
- 371 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
330
ACUS11 KWNS 230526
SWOMCD
SPC MCD 230525
NCZ000-VAZ000-230700-
MESOSCALE DISCUSSION 0144
NWS STORM PREDICTION CENTER NORMAN OK
1125 PM CST WED FEB 22 2012
AREAS AFFECTED...CNTRL NC...SRN VA
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 230525Z - 230700Z
AN ISOLATED SEVERE THREAT ONGOING WITH A CONVECTIVE LINE IN WCNTRL
NC WILL LIKELY CONTINUE FOR A FEW MORE HOURS. HOWEVER...THE THREAT
SHOULD REMAIN ISOLATED AND WW ISSUANCE DOES NOT APPEAR LIKELY ATTM.
A NEARLY CONTINUOUS LINE OF THUNDERSTORMS IS ONGOING JUST AHEAD A
WELL-DEFINED SHORTWAVE TROUGH MOVING THROUGH THE SRN APPALACHIAN
MTNS. REGIONAL WSR-88D VWPS AND FORECAST SOUNDINGS OVER CNTRL NC
THIS EVENING SHOW VERY STRONG DEEP LAYER SHEAR WITH 0-6 KM SHEAR
AROUND 70 KT. THIS ALONG WITH AN EWD STORM MOTION OF 40 TO 50 KT IS
CREATING A WIND DAMAGE THREAT ALONG THE LEADING EDGE OF THE LINE.
ALTHOUGH...A GUST OF 46 KT WAS RECORDED EARLIER AT
GREENSBORO...OBSERVATIONS OVER THE LAST HALF HOUR SUGGEST WINDS WITH
THE LINE HAVE RECENTLY BEEN BELOW 40 KT SUGGESTING THE WIND DAMAGE
THREAT IS MARGINAL. THE ORIENTATION OF THE WIND FIELD PARALLEL TO
THE LINE AND THE WEAK INSTABILITY COULD BE RESULTING IN THE MARGINAL
THREAT. FOR THIS REASON...A WATCH IS NOT EXPECTED DURING THE
OVERNIGHT PERIOD.
..BROYLES.. 02/23/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...AKQ...RAH...ILM...RNK...
LAT...LON 36547788 36217758 35727791 35517810 35167838 34827876
34787923 34967967 35248004 35528009 36687857 36547788Nearby
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; radar from the NEXRAD Level II archive.