Alert archive / North Carolina / Mesoscale Discussions in 2011
Mesoscale Discussion 718
The Storm Prediction Center issued this mesoscale discussion at May 10, 2011, 10:18 PM EDT for 22 counties in North Carolina; 7 counties in South Carolina; 6 counties in Tennessee. It was in force for 27 min.
The area
The outline as issued.
The facts
- Issued
- May 10, 2011, 10:18 PM EDT (02:18 UTC)
- Expired
- May 10, 2011, 10:45 PM EDT
- In force
- 27 min
- Issued by
- the Storm Prediction Center
All 35 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, Jackson County, NC, Lincoln County, NC, Madison County, NC, McDowell County, NC, Mitchell County, NC, Polk County, NC, Rutherford County, NC, Transylvania County, NC, Watauga County, NC, Wilkes County, NC, Yancey County, NC, Anderson County, SC, Cherokee County, SC, Greenville County, SC, Oconee County, SC, Pickens County, SC, Spartanburg County, SC, York County, SC, Carter County, TN, Cocke County, TN, Greene County, TN, Johnson County, TN, Unicoi County, TN, Washington County, TN
The radar
The Greer radar (KGSP), 97 km from the middle of the area, began a volume at 02:19 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, 2.3 hours before the alert went out and 223 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.
796 ACUS11 KWNS 110218 SWOMCD SPC MCD 110218 NCZ000-SCZ000-TNZ000-GAZ000-110245- MESOSCALE DISCUSSION 0718 NWS STORM PREDICTION CENTER NORMAN OK 0918 PM CDT TUE MAY 10 2011 AREAS AFFECTED...ERN TN...WRN NC...NRN SC CONCERNING...SEVERE THUNDERSTORM WATCH 269... VALID 110218Z - 110245Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 269 CONTINUES. ...NEW WW WILL BE ISSUED SOON FOR PORTIONS OF THE SRN APPALACHIANS... WELL DEFINED MCS IS SURGING SSEWD AT 40-45KT INTO NERN PORTIONS OF TN AT 0215Z. DAMAGING WINDS AND LARGE HAIL WILL LIKELY ACCOMPANY THIS ACTIVITY AS IT SPREADS ACROSS THE MOUNTAINS OF ERN TN/NC INTO NRN SC. NEW WW WILL BE ISSUED SOON. ..DARROW.. 05/11/2011 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...RNK...GSP...MRX... LAT...LON 36478283 36458097 34818091 34468299 35858352 36478283
SPC 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, 10:42 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, 2:37 AM EDT | Mesoscale Discussion | SPC | Alexander, Ashe, Avery, Buncombe, Burke, Caldwell and 14 more | 23 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 |
Nearby
Mesoscale Discussions in North Carolina, 2011Mesoscale Discussions in South Carolina, 2011Mesoscale Discussions in Tennessee, 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.