Alert archive / North Carolina / Mesoscale Discussions in 2011
Mesoscale Discussion 375
The Storm Prediction Center issued this mesoscale discussion at Apr 8, 2011, 9:10 PM EDT for 17 counties in North Carolina. It was in force for 65 min.
The area
The outline as issued.
The facts
- Issued
- Apr 8, 2011, 9:10 PM EDT (01:10 UTC)
- Expired
- Apr 8, 2011, 10:15 PM EDT
- In force
- 65 min
- Issued by
- the Storm Prediction Center
Counties Alamance County, NC, Caswell County, NC, Chatham County, NC, Davidson County, NC, Durham County, NC, Forsyth County, NC, Guilford County, NC, Harnett County, NC, Johnston County, NC, Lee County, NC, Orange County, NC, Randolph County, NC, Rockingham County, NC, Stokes County, NC, Wake County, NC, Wayne County, NC, Wilson County, NC
The radar
The Raleigh/Durham radar (KRAX), 66 km from the middle of the area, began a volume at 01:13 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, 1.2 hours before the alert went out and 69 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
- 42 J/kg
- Mixed-layer CIN
- -165 J/kg
- Mixed-layer LCL
- 1618 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 279 m²/s²
- 0-3 km storm-relative helicity
- 424 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
The text
As transmitted, in the capitals the NWS used until 2016.
348
ACUS11 KWNS 090110
SWOMCD
SPC MCD 090110
NCZ000-VAZ000-090215-
MESOSCALE DISCUSSION 0375
NWS STORM PREDICTION CENTER NORMAN OK
0810 PM CDT FRI APR 08 2011
AREAS AFFECTED...WRN/CNTRL NC
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 090110Z - 090215Z
SEVERE THUNDERSTORMS PRIMARILY CAPABLE OF PRODUCING LARGE HAIL AND
LOCALLY DMGG WINDS ARE GRADUALLY PROGRESSING SEWD INTO N CNTRL
NC...AND MAY CONTINUE OVER THE NEXT FEW HOURS. HOWEVER...GIVEN
SOMEWHAT ISOLATED COVERAGE...A WW MAY NOT BECOME NECESSARY.
WEDGE FRONT HAS REMAINED NEARLY STATIONARY OVER NERN NC WWD THROUGH
MUCH OF CNTRL NC. A WEAK UPPER WAVE OBSERVED ON WV IMAGERY OVER WV
SWD THROUGH NRN AL HAS ALLOWED A SUBTLE WARM ADVECTION REGIME TO
MAINTAIN THE SEVERITY OF CONVECTION N OF THE WEDGE FRONT...DESPITE
THE ONSET OF RADIATIONAL COOLING. 00Z GSO SOUNDING INDICATES WEAK
INSTABILITY EAST OF THE APPALACHIANS...WHICH MAY IMPEDE STRONGER AND
MORE WIDESPREAD DEVELOPMENT. HOWEVER...STRONG WLY WINDS HAVE ALLOWED
AN EML TO SPREAD TO THE CAROLINAS...WITH STEEP MID LEVEL LAPSE RATES
AND STRONG DEEP-LAYER WIND PROFILES SUPPORTING LARGE HAIL IN ANY
ELEVATED STORMS THAT CAN DEVELOP. AN ISOLATED TORNADO CANNOT BE
RULED OUT IN CLOSER PROXIMITY TO THE WEDGE FRONT.
..HURLBUT.. 04/09/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MHX...RAH...RNK...GSP...
LAT...LON 36608026 36307877 35657775 35197767 35147860 35467977
35908041 36608026SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 11:07 PM EDT | Severe Thunderstorm Watch | SPC | Alleghany, Ashe, Rockingham, Stokes, Surry, Watauga and 2 more | 6 hr |
| Apr 9, 12:42 AM EDT | Mesoscale Discussion | SPC | Alamance, Alexander, Alleghany, Ashe, Avery, Cabarrus and 23 more | 93 min |
| Apr 9, 3:23 AM EDT | Mesoscale Discussion | SPC | Alexander, Alleghany, Ashe, Avery, Burke, Cabarrus and 19 more | 67 min |
| Apr 9, 12:34 PM EDT | Severe Thunderstorm Watch | SPC | Alleghany, Ashe, Avery, Buncombe, Burke, Caldwell and 17 more | 4 hr |
| Apr 9, 2:00 PM EDT | Tornado Watch | SPC | Alleghany, Ashe, Avery, Buncombe, Burke, Caldwell and 17 more | 7 hr |
| Apr 9, 2:44 PM EDT | Severe Thunderstorm Watch | SPC | Alexander, Anson, Cabarrus, Catawba, Cleveland, Davie and 7 more | 6 hr |
| Apr 9, 4:21 PM EDT | Mesoscale Discussion | SPC | Ashe, Avery, Buncombe, Burke, Caldwell, Cherokee and 15 more | 84 min |
| Apr 9, 5:36 PM EDT | Mesoscale Discussion | SPC | Cleveland, Gaston, Lincoln, Mecklenburg, Polk, Rutherford and 1 more | 54 min |
| Apr 9, 6:16 PM EDT | Tornado Watch | SPC | Buncombe, Burke, Cleveland, Gaston, Haywood, Henderson and 10 more | 6 hr |
| Apr 9, 7:59 PM EDT | Mesoscale Discussion | SPC | Anson, Buncombe, Burke, Cabarrus, Catawba, Cleveland and 13 more | 61 min |
Nearby
Mesoscale Discussions in North 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.