Alert archive / West Virginia / Mesoscale Discussions in 2011
Mesoscale Discussion 588
The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2011, 1:49 PM EDT for 4 states. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Apr 26, 2011, 1:49 PM EDT (17:49 UTC)
- Expired
- Apr 26, 2011, 2:45 PM EDT
- In force
- 56 min
- Issued by
- the Storm Prediction Center
All 75 counties
Martin County, KY, Allegany County, MD, Garrett County, MD, Alleghany County, VA, Augusta County, VA, Bath County, VA, Bland County, VA, Botetourt County, VA, Buchanan County, VA, City of Buena Vista, VA, City of Covington, VA, City of Harrisonburg, VA, City of Lexington, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, City of Staunton, VA, City of Waynesboro, VA, Craig County, VA, Frederick County, VA, Giles County, VA, Highland County, VA, Montgomery County, VA, Page County, VA, Pulaski County, VA, Roanoke County, VA, Rockbridge County, VA, Rockingham County, VA, Shenandoah County, VA, Barbour County, WV, Boone County, WV, Braxton County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Fayette County, WV, Gilmer County, WV, Grant County, WV, Greenbrier County, WV, Hampshire County, WV, Hardy County, WV, Harrison County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Logan County, WV, Marion County, WV, McDowell County, WV, Mercer County, WV, Mineral County, WV, Mingo County, WV, Monongalia County, WV, Monroe County, WV, Nicholas County, WV, Pendleton County, WV, Pleasants County, WV, Pocahontas County, WV, Preston County, WV, Putnam County, WV, Raleigh County, WV, Randolph County, WV, Ritchie County, WV, Roane County, WV, Summers County, WV, Taylor County, WV, Tucker County, WV, Tyler County, WV, Upshur County, WV, Wayne County, WV, Webster County, WV, Wetzel County, WV, Wirt County, WV, Wyoming County, WV
The radar
The Charleston,WV radar (KRLX), 104 km from the middle of the area, began a volume at 17:52 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
Roanoke, VA (KRNK), launched 12:00Z, 5.8 hours before the alert went out and 150 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
- 106 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 720 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 171 m²/s²
- 0-3 km storm-relative helicity
- 211 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
718
ACUS11 KWNS 261750
SWOMCD
SPC MCD 261749
VAZ000-WVZ000-MDZ000-PAZ000-OHZ000-KYZ000-261845-
MESOSCALE DISCUSSION 0588
NWS STORM PREDICTION CENTER NORMAN OK
1249 PM CDT TUE APR 26 2011
AREAS AFFECTED...WV...WRN VA
CONCERNING...SEVERE POTENTIAL...SEVERE THUNDERSTORM WATCH LIKELY
VALID 261749Z - 261845Z
TSTM COVERAGE HAS RECENTLY INCREASED ACROSS WRN WV AND MAY EVOLVE
SIMILARLY TO SCENARIO DESCRIBED IN MCD 0586 WITH UPSCALE GROWTH INTO
CLUSTERS PRODUCING DAMAGING WINDS AND ISOLATED SEVERE HAIL. THE
PROBABILITY OF A SEVERE TSTM WATCH ISSUANCE BY 19Z IS 80 PERCENT.
SHOWER/TSTM ACTIVITY HAS INCREASED ALONG A CONFLUENCE AXIS
STRETCHING FROM SWRN PA INTO ERN KY. TEMPERATURES HAVE NOW WARMED
INTO THE UPPER 70S TO MIDDLE 80S DOWNSTREAM OF THIS AXIS ACROSS WV
INTO WRN VA. ALTHOUGH RECENT HRRR RUNS APPEAR TOO SLOW WITH ONGOING
DEVELOPMENT...THE DEPICTION OF UPSCALE GROWTH INTO ONE OR MORE
CLUSTERS APPEARS PROBABLE AS MLCAPE INCREASES TO BETWEEN 1000 TO
2000 J/KG AND ON THE TRAILING PERIPHERY OF FORCED ASCENT ASSOCIATED
WITH THE UPPER GREAT LAKES SHORT WAVE TROUGH. GIVEN EFFECTIVE SHEAR
OF 35-45 KT...ORGANIZED UPDRAFTS WILL BE CAPABLE OF PRODUCING
DAMAGING WINDS AND ISOLATED SEVERE HAIL.
..GRAMS.. 04/26/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CTP...LWX...RNK...PBZ...RLX...JKL...
LAT...LON 38138274 39718085 39878008 39627847 39147822 38347858
37507955 37197995 37048078 37188190 37538248 38138274SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 8:34 PM EDT | Mesoscale Discussion | SPC | Ballard, Caldwell, Calloway, Carlisle, Crittenden, Fulton and 9 more | 116 min |
| Apr 26, 12:05 AM EDT | Mesoscale Discussion | SPC | Ballard, Butler, Caldwell, Calloway, Carlisle, Christian and 19 more | 115 min |
| Apr 26, 12:42 AM EDT | Severe Thunderstorm Watch | SPC | Allen, Barren, Breckinridge, Butler, Caldwell, Calloway and 19 more | 7 hr |
| Apr 26, 3:04 AM EDT | Mesoscale Discussion | SPC | Allen, Barren, Breckinridge, Edmonson, Grayson, Hardin and 5 more | 56 min |
| Apr 26, 3:41 PM EDT | Mesoscale Discussion | SPC | Ballard, Calloway, Carlisle, Fulton, Graves, Hickman and 2 more | 94 min |
| Apr 26, 4:02 PM EDT | Tornado Watch | SPC | Ballard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more | 7 hr |
| Apr 26, 5:38 PM EDT | Mesoscale Discussion | SPC | Breckinridge, Bullitt, Hancock, Henderson, Jefferson, Meade and 2 more | 37 min |
| Apr 26, 5:50 PM EDT | Tornado Watch | SPC | Allen, Anderson, Barren, Breckinridge, Bullitt, Butler and 25 more | 5 hr |
| Apr 26, 7:17 PM EDT | Mesoscale Discussion | SPC | Ballard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 14 more | 118 min |
| Apr 26, 1:18 PM EDT | Mesoscale Discussion | SPC | Allegany, Garrett, Washington | 57 min |
| Apr 26, 1:49 PM EDT | Severe Thunderstorm Watch | SPC | Garrett | 7 hr |
| Apr 26, 2:09 PM EDT | Severe Thunderstorm Watch | SPC | Allegany, Washington | 7 hr |
| Apr 26, 4:34 PM EDT | Mesoscale Discussion | SPC | Allegany, Garrett, Washington | 56 min |
| Apr 26, 7:44 PM EDT | Mesoscale Discussion | SPC | Allegany, Garrett, Washington | 61 min |
| Apr 26, 2:16 PM EDT | Mesoscale Discussion | SPC | Brunswick, Charles City, Dinwiddie, Gloucester, Greensville, Henrico and 26 more | 59 min |
Nearby
Mesoscale Discussions in West Virginia, 2011Mesoscale Discussions in Virginia, 2011Mesoscale Discussions in Maryland, 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.