Alert archive / Virginia / Mesoscale Discussions in 2011
Mesoscale Discussion 937
The Storm Prediction Center issued this mesoscale discussion at May 24, 2011, 7:33 PM EDT for 17 counties in North Carolina; 19 counties in Virginia; McDowell County, West Virginia. It was in force for 57 min.
The area
The outline as issued.
The facts
- Issued
- May 24, 2011, 7:33 PM EDT (23:33 UTC)
- Expired
- May 24, 2011, 8:30 PM EDT
- In force
- 57 min
- Issued by
- the Storm Prediction Center
All 37 counties
Alamance County, NC, Alleghany County, NC, Ashe County, NC, Caswell County, NC, Durham County, NC, Forsyth County, NC, Granville County, NC, Guilford County, NC, Orange County, NC, Person County, NC, Rockingham County, NC, Stokes County, NC, Surry County, NC, Wake County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Bland County, VA, Carroll County, VA, Charlotte County, VA, City of Danville, VA, City of Galax, VA, City of Martinsville, VA, City of Radford, VA, Floyd County, VA, Franklin County, VA, Grayson County, VA, Halifax County, VA, Henry County, VA, Montgomery County, VA, Patrick County, VA, Pittsylvania County, VA, Pulaski County, VA, Smyth County, VA, Tazewell County, VA, Wythe County, VA, McDowell County, WV
The radar
The Roanoke radar (KFCX), 37 km from the middle of the area, began a volume at 23:34 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 12:00Z, 11.6 hours before the alert went out and 91 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
- 451 J/kg
- Mixed-layer CIN
- -124 J/kg
- Mixed-layer LCL
- 1350 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
The text
As transmitted, in the capitals the NWS used until 2016.
260 ACUS11 KWNS 242334 SWOMCD SPC MCD 242333 NCZ000-VAZ000-WVZ000-TNZ000-250030- MESOSCALE DISCUSSION 0937 NWS STORM PREDICTION CENTER NORMAN OK 0633 PM CDT TUE MAY 24 2011 AREAS AFFECTED...PORTIONS OF S-CNTRL/SWRN VA...NWRN NC CONCERNING...TORNADO WATCH 361... VALID 242333Z - 250030Z THE SEVERE WEATHER THREAT FOR TORNADO WATCH 361 CONTINUES. AT 2330Z...REGIONAL RADAR IMAGERY INDICATED A BROKEN LINE OF CELLS FROM 25 NW OF DAN TO 30 NNW HKY...WITH WEAKER ACTIVITY OCCURRING IN ITS WAKE NEAR THE TN/NC BORDER AND SWRN VA. SURFACE TEMPERATURES OVER WRN NC HAVE BEGUN TO COOL SLIGHTLY DURING THE LAST HR...WITH MLCAPE VALUES NOW AROUND 500 J/KG. THE STABILIZING BOUNDARY LAYER MAY EVENTUALLY LEAD TO A REDUCED SVR WEATHER THREAT DURING THE NEXT FEW HRS...THOUGH IN THE SHORT TERM...THE THREAT FOR DAMAGING WINDS/LARGE HAIL AND PERHAPS AN ISOLATED TORNADO WILL CONTINUE. ..GARNER.. 05/24/2011 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...AKQ...RAH...RNK...RLX...GSP...MRX... LAT...LON 37428183 37047850 35737849 36128184 37428183
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 24, 8:34 AM EDT | Mesoscale Discussion | SPC | Alamance, Alexander, Alleghany, Ashe, Avery, Caldwell and 13 more | 116 min |
| May 24, 10:00 AM EDT | Severe Thunderstorm Watch | SPC | Alleghany, Ashe, Caswell, Rockingham, Stokes, Surry and 3 more | 7 hr |
| May 24, 12:15 PM EDT | Mesoscale Discussion | SPC | Alamance, Bertie, Camden, Caswell, Chowan, Durham and 24 more | 90 min |
| May 24, 12:42 PM EDT | Severe Thunderstorm Watch | SPC | Alamance, Bertie, Camden, Chowan, Currituck, Durham and 20 more | 5 hr |
| May 24, 3:33 PM EDT | Mesoscale Discussion | SPC | Alamance, Alexander, Alleghany, Ashe, Avery, Bertie and 30 more | 87 min |
| May 24, 4:43 PM EDT | Tornado Watch | SPC | Alamance, Alleghany, Ashe, Caswell, Forsyth, Guilford and 8 more | 5 hr |
| May 24, 7:01 AM EDT | Severe Thunderstorm Watch | SPC | Lee, Russell, Scott, Washington, Wise, City of Bristol and 1 more | 8 hr |
| May 24, 12:55 PM EDT | Mesoscale Discussion | SPC | Lee, Scott, Wise, City of Norton | 65 min |
| May 24, 1:57 PM EDT | Severe Thunderstorm Watch | SPC | Buchanan, Dickenson, Lee, Russell, Scott, Washington and 3 more | 6 hr |
| May 24, 4:27 PM EDT | Mesoscale Discussion | SPC | Buchanan, Dickenson, Lee, Russell, Scott, Tazewell and 4 more | 63 min |
| May 24, 7:46 PM EDT | Mesoscale Discussion | SPC | Lee, Russell, Scott, Washington, Wise, City of Bristol and 1 more | 59 min |
| May 23, 8:07 PM EDT | Mesoscale Discussion | SPC | Brooke, Hancock | 83 min |
| May 23, 8:31 PM EDT | Severe Thunderstorm Watch | SPC | Brooke, Cabell, Calhoun, Doddridge, Gilmer, Hancock and 15 more | 3 hr |
Nearby
Mesoscale Discussions in Virginia, 2011Mesoscale Discussions in North Carolina, 2011Mesoscale Discussions in West 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.