Alert archive / West Virginia / Mesoscale Discussions in 2011
Mesoscale Discussion 868
The Storm Prediction Center issued this mesoscale discussion at May 22, 2011, 7:26 PM EDT for 6 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 22, 2011, 7:26 PM EDT (23:26 UTC)
- Expired
- May 22, 2011, 9:30 PM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 101 counties
Boyd County, KY, Carter County, KY, Elliott County, KY, Floyd County, KY, Greenup County, KY, Johnson County, KY, Lawrence County, KY, Letcher County, KY, Martin County, KY, Pike County, KY, Alexander County, NC, Alleghany County, NC, Ashe County, NC, Avery County, NC, Buncombe County, NC, Burke County, NC, Caldwell County, NC, Haywood County, NC, Henderson County, NC, Jackson County, NC, Madison County, NC, McDowell County, NC, Mitchell County, NC, Polk County, NC, Rutherford County, NC, Swain County, NC, Transylvania County, NC, Watauga County, NC, Wilkes County, NC, Yancey County, NC, Athens County, OH, Gallia County, OH, Hocking County, OH, Jackson County, OH, Lawrence County, OH, Meigs County, OH, Morgan County, OH, Noble County, OH, Perry County, OH, Scioto County, OH, Vinton County, OH, Washington County, OH, Carter County, TN, Cocke County, TN, Greene County, TN, Hamblen County, TN, Hawkins County, TN, Johnson County, TN, Sullivan County, TN, Unicoi County, TN, Washington County, TN, Bland County, VA, Buchanan County, VA, Carroll County, VA, City of Bristol, VA, City of Galax, VA, City of Norton, VA, City of Radford, VA, Dickenson County, VA, Giles County, VA, Grayson County, VA, Pulaski County, VA, Russell County, VA, Scott County, VA, Smyth County, VA, Tazewell County, VA, Washington County, VA, Wise County, VA, Wythe County, VA, Boone County, WV, Braxton County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Fayette County, WV, Gilmer County, WV, Greenbrier County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Logan County, WV, Mason County, WV, McDowell County, WV, Mercer County, WV, Mingo County, WV, Monroe County, WV, Nicholas County, WV, Pleasants County, WV, Putnam County, WV, Raleigh County, WV, Ritchie County, WV, Roane County, WV, Summers County, WV, Tyler County, WV, Wayne County, WV, Webster County, WV, Wirt County, WV, Wood County, WV, Wyoming County, WV
The radar
The Charleston,WV radar (KRLX), 66 km from the middle of the area, began a volume at 23:26 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
Cncnati-Daytn, OH (KILN), launched 12:00Z, 11.4 hours before the alert went out and 236 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
- 460 J/kg
- Mixed-layer CIN
- -27 J/kg
- Mixed-layer LCL
- 720 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 4 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
430
ACUS11 KWNS 222327
SWOMCD
SPC MCD 222326
WVZ000-VAZ000-NCZ000-OHZ000-TNZ000-KYZ000-SCZ000-230130-
MESOSCALE DISCUSSION 0868
NWS STORM PREDICTION CENTER NORMAN OK
0626 PM CDT SUN MAY 22 2011
AREAS AFFECTED...SERN OH...WRN/CNTRL WV...ERN KY...WRN VA...WRN
NC...ERN TN
CONCERNING...SEVERE THUNDERSTORM WATCH 324...333...
VALID 222326Z - 230130Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
324...333...CONTINUES.
SCATTERED TO NUMEROUS STRONG TO SEVERE CONVECTION CONTINUES PUSHING
EWD/ENEWD OUT OF WW324 AND ACROSS WW333. WW324 WILL BE ALLOWED TO
EXPIRE AT 01Z.
REGIONAL RADAR IMAGERY DEPICTS A BROKEN BAND OF CONVECTION EXTENDING
FROM S-CNTRL OH INTO SRN WV...WITH MORE ISOLATED TO SCATTERED
ACTIVITY FARTHER SOUTH INTO PORTIONS OF WRN VA...WRN NC...AND ERN
TN. THE EXPANSIVE COLD POOL DRIVEN BY THIS ACTIVITY WILL PROMOTE ITS
EWD PROGRESSION DURING THE NEXT FEW HOURS...AUGMENTED BY MODEST
MID-LEVEL FLOW /WLY 500-MB WINDS AT 25 KT DEPICTED IN CHARLESTON WV
VWP/. MODERATE INSTABILITY AHEAD OF THIS ACTIVITY WILL SUPPORT
CONTINUED CONVECTIVE REGENERATION...MAINLY PRIOR TO SUNSET.
THEREAFTER...DECREASING INSTABILITY AND THE LACK OF STRONGER ASCENT
WILL LARGELY RESULT IN A WANING SVR POTENTIAL. UNTIL
THEN...TEMPERATURE-DEWPOINT SPREADS OF IN EXCESS OF 20F AHEAD OF THE
ACTIVITY /OWING TO PRECONVECTIVE MIXING/ WILL SUPPORT STRONG
DOWNDRAFTS WITH THE THREAT FOR DMGG WINDS...PARTICULARLY WITH ANY
ORGANIZED BOWING LINE SEGMENTS. ALSO...A FEW OF THE MORE VIGOROUS
UPDRAFTS...ENHANCED BY EFFECTIVE BULK SHEAR MAGNITUDES OF 25 TO 35
KT...COULD YIELD A SECONDARY THREAT FOR LARGE HAIL. CONVECTION IS
NOT FORECAST TO REDEVELOP IN THE WAKE OF ONGOING ACTIVITY DUE TO
CONVECTIVE OVERTURNING COUPLED WITH ONLY NEUTRAL FORCING FOR ASCENT
PER RECENT WATER VAPOR IMAGERY.
..COHEN.. 05/22/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...RNK...PBZ...RLX...GSP...MRX...JKL...ILN...
LAT...LON 39838159 39558051 38548015 36848046 35668127 35258197
35078301 35568348 36848308 37788284 38108313 38848309
39418278 39798222 39838159SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 22, 1:55 PM EDT | Mesoscale Discussion | SPC | Adair, Allen, Anderson, Barren, Bath, Bell and 64 more | 65 min |
| May 22, 2:18 PM EDT | Severe Thunderstorm Watch | SPC | Adair, Allen, Anderson, Barren, Bath, Bell and 76 more | 7 hr |
| May 22, 2:51 PM EDT | Mesoscale Discussion | SPC | Boone, Boyd, Bracken, Campbell, Carroll, Carter and 8 more | 54 min |
| May 22, 4:44 PM EDT | Mesoscale Discussion | SPC | Bath, Bell, Bourbon, Boyd, Bracken, Breathitt and 44 more | 61 min |
| May 22, 5:40 PM EDT | Severe Thunderstorm Watch | SPC | Boyd, Carter, Greenup, Lawrence | 5 hr |
| May 22, 3:15 PM EDT | Mesoscale Discussion | SPC | Fulton, Lucas, Williams | 60 min |
| May 22, 6:18 AM EDT | Mesoscale Discussion | SPC | Crockett, Dyer, Fayette, Hardeman, Haywood, Lake and 3 more | 57 min |
| May 22, 8:03 AM EDT | Severe Thunderstorm Watch | SPC | Chester, Crockett, Decatur, Fayette, Hardeman, Hardin and 7 more | 7 hr |
| May 22, 2:09 PM EDT | Mesoscale Discussion | SPC | Chester, Fayette, Hardeman, Hardin, Haywood, McNairy and 3 more | 66 min |
Nearby
Mesoscale Discussions in West Virginia, 2011Mesoscale Discussions in North Carolina, 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.