Alert archive / North Carolina / Mesoscale Discussions in 2011
Mesoscale Discussion 723
The Storm Prediction Center issued this mesoscale discussion at May 11, 2011, 2:37 AM EDT for 4 states. It was in force for 23 min.
The area
The outline as issued.
The facts
- Issued
- May 11, 2011, 2:37 AM EDT (06:37 UTC)
- Expired
- May 11, 2011, 3:00 AM EDT
- In force
- 23 min
- Issued by
- the Storm Prediction Center
All 46 counties
Alexander County, NC, Ashe County, NC, Avery County, NC, Buncombe County, NC, Burke County, NC, Caldwell County, NC, Catawba County, NC, Cleveland County, NC, Gaston County, NC, Haywood County, NC, Henderson County, NC, Lincoln County, NC, Madison County, NC, McDowell County, NC, Mecklenburg County, NC, Mitchell County, NC, Polk County, NC, Rutherford County, NC, Watauga County, NC, Yancey County, NC, Cherokee County, SC, Chester County, SC, Greenville County, SC, Laurens County, SC, Spartanburg County, SC, Union County, SC, York County, SC, Carter County, TN, Cocke County, TN, Greene County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN, Johnson County, TN, Sullivan County, TN, Unicoi County, TN, Washington County, TN, Buchanan County, VA, City of Bristol, VA, City of Norton, VA, Dickenson County, VA, Lee County, VA, Russell County, VA, Scott County, VA, Washington County, VA, Wise County, VA
The radar
The Greer radar (KGSP), 106 km from the middle of the area, began a volume at 06:40 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, 6.6 hours before the alert went out and 192 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
- 694 J/kg
- Mixed-layer CIN
- -146 J/kg
- Mixed-layer LCL
- 1286 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 109 m²/s²
- 0-3 km storm-relative helicity
- 420 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 11.6
The text
As transmitted, in the capitals the NWS used until 2016.
471
ACUS11 KWNS 110637
SWOMCD
SPC MCD 110637
NCZ000-SCZ000-VAZ000-TNZ000-KYZ000-110700-
MESOSCALE DISCUSSION 0723
NWS STORM PREDICTION CENTER NORMAN OK
0137 AM CDT WED MAY 11 2011
AREAS AFFECTED...SWRN VA...PARTS OF EXTREME ERN TN AND WRN NC
CONCERNING...SEVERE THUNDERSTORM WATCH 273...
VALID 110637Z - 110700Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 273
CONTINUES.
A NEW SEVERE TSTM WATCH MAY BE NEEDED ACROSS SWRN VA...PARTS OF
EXTREME ERN TN AND WRN NC. THE STRONGEST ACTIVITY ACROSS ERN KY
SHOULD MOVE S OF WW 275 AROUND 08Z. GIVEN THIS FACTOR...WW 273 WILL
BE ALLOWED TO EXPIRE AND/OR BE CANCELLED EARLY...WITH CONTINUED
MONITORING OF UPSTREAM CONVECTIVE TRENDS FOR INCREASE IN STRONGER
CORES. IF THIS OCCURS...THEN A NEW WW WOULD LIKELY BE NEEDED S OF
WW 275.
05Z SURFACE ANALYSIS SHOWED A WARM FRONT EXTENDING FROM JUST N OF
CHICAGO SEWD THROUGH CENTRAL IND...FAR SWRN OH AND THEN SSEWD
THROUGH CENTRAL/ERN KY TO ERN TN AND NERN-ERN GA. REGIONAL RADAR
IMAGERY SHOWED A PROGRESSIVE MCS TRACKING SSEWD THROUGH CENTRAL SC.
DESPITE STABILIZATION OF THE BOUNDARY LAYER IN THE WAKE OF THIS MCS
UPSTREAM ACROSS UPSTATE SC TO WRN NC...NEW TSTMS CONTINUE TO DEVELOP
AND TRACK SSEWD ACROSS ERN KY TOWARD FAR SWRN VA. THIS LATTER
ACTIVITY IS BEING FED BY A WLY 20-30 KT LLJ WITH MUCAPE 1000-2000
J/KG. THIS COMBINED WITH EFFECTIVE BULK SHEAR AROUND 35 KT AND THIS
REGION RESIDING ALONG THE ERN EXTENT OF EML/STEEP MID LEVEL LAPSE
RATES...THE POTENTIAL REMAINS FOR ORGANIZED STORMS PRODUCING HAIL
AND STRONG WIND GUSTS...AS ACTIVITY MOVES SSEWD. AS THE LLJ VEERS
TO NWLY OVERNIGHT THROUGH 12Z...ACTIVITY OVER ERN KY SHOULD CONTINUE
TO DEVELOP AND TRACK INTO SWRN VA...ERN TN/WRN NC WITH POTENTIAL FOR
AT LEAST ISOLATED SEVERE STORMS. IF ERN KY ACTIVITY IS
SUSTAINED...THEN A NEW WW WOULD BE POSSIBLE.
..PETERS.. 05/11/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...RNK...RLX...CAE...GSP...MRX...JKL...
LAT...LON 35298064 34688089 34318203 35098264 35748321 36548343
36958310 37448197 36848157 35298064SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 9:01 PM EDT | Mesoscale Discussion | SPC | Alexander, Alleghany, Anson, Ashe, Avery, Bladen and 46 more | 59 min |
| May 10, 10:18 PM EDT | Mesoscale Discussion | SPC | Alexander, Ashe, Avery, Buncombe, Burke, Caldwell and 16 more | 27 min |
| May 10, 10:42 PM EDT | Severe Thunderstorm Watch | SPC | Alexander, Avery, Buncombe, Burke, Caldwell, Catawba and 13 more | 4 hr |
| May 11, 12:14 AM EDT | Mesoscale Discussion | SPC | Alexander, Alleghany, Ashe, Avery, Buncombe, Burke and 17 more | 61 min |
| May 11, 6:06 PM EDT | Mesoscale Discussion | SPC | Buncombe, Haywood, Henderson, Jackson, Polk, Transylvania | 54 min |
| May 11, 12:41 AM EDT | Severe Thunderstorm Watch | SPC | Aiken, Bamberg, Barnwell, Calhoun, Chesterfield, Clarendon and 11 more | 3 hr |
| May 11, 1:35 AM EDT | Mesoscale Discussion | SPC | Berkeley, Charleston, Darlington, Dorchester, Florence, Georgetown and 2 more | 25 min |
| May 11, 1:41 AM EDT | Severe Thunderstorm Watch | SPC | Berkeley, Charleston, Darlington, Dillon, Dorchester, Florence and 5 more | 3 hr |
| May 11, 3:34 AM EDT | Mesoscale Discussion | SPC | Berkeley, Charleston, Chesterfield, Colleton, Darlington, Dillon and 7 more | 56 min |
| May 10, 11:17 PM EDT | Mesoscale Discussion | SPC | Bland, Buchanan, Dickenson, Floyd, Giles, Montgomery and 7 more | 58 min |
Nearby
Mesoscale Discussions in North Carolina, 2011Mesoscale Discussions in Tennessee, 2011Mesoscale Discussions in Virginia, 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.