Alert archive / West Virginia / Mesoscale Discussions in 2012
Mesoscale Discussion 190
The Storm Prediction Center issued this mesoscale discussion at Feb 29, 2012, 7:30 PM EST for 23 counties in Ohio; 5 counties in Pennsylvania; 39 counties in West Virginia. It was in force for 30 min.
The area
The outline as issued.
The facts
- Issued
- Feb 29, 2012, 7:30 PM EST (00:30 UTC)
- Expired
- Feb 29, 2012, 8:00 PM EST
- In force
- 30 min
- Issued by
- the Storm Prediction Center
All 67 counties
Athens County, OH, Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Gallia County, OH, Guernsey County, OH, Harrison County, OH, Holmes County, OH, Jefferson County, OH, Mahoning County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Portage County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Washington County, OH, Wayne County, OH, Beaver County, PA, Greene County, PA, Lawrence County, PA, Mercer County, PA, Washington County, PA, Barbour County, WV, Boone County, WV, Braxton County, WV, Brooke County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Fayette County, WV, Gilmer County, WV, Hancock County, WV, Harrison County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Logan County, WV, Marion County, WV, Marshall County, WV, Mason County, WV, Monongalia County, WV, Nicholas County, WV, Ohio County, WV, Pleasants County, WV, Pocahontas County, WV, Putnam County, WV, Raleigh County, WV, Randolph County, WV, Ritchie County, WV, Roane County, WV, Taylor County, WV, Tyler County, WV, Upshur County, WV, Wayne County, WV, Webster County, WV, Wetzel County, WV, Wirt County, WV, Wood County, WV, Wyoming County, WV
The radar
The Charleston,WV radar (KRLX), 99 km from the middle of the area, began a volume at 00:30 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
Pittsburgh, PA (KPIT), launched 00:00Z, 0.5 hours before the alert went out and 178 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
- 377 J/kg
- Mixed-layer CIN
- -40 J/kg
- Mixed-layer LCL
- 848 m above ground
- 0-6 km bulk shear
- 98 kt
- 0-1 km storm-relative helicity
- 120 m²/s²
- 0-3 km storm-relative helicity
- 152 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 1.6
The text
As transmitted, in the capitals the NWS used until 2016.
512 ACUS11 KWNS 010031 SWOMCD SPC MCD 010030 PAZ000-WVZ000-OHZ000-KYZ000-010100- MESOSCALE DISCUSSION 0190 NWS STORM PREDICTION CENTER NORMAN OK 0630 PM CST WED FEB 29 2012 AREAS AFFECTED...SERN AND ERN OH / MUCH OF WV CONCERNING...TORNADO WATCH 49... VALID 010030Z - 010100Z THE SEVERE WEATHER THREAT FOR TORNADO WATCH 49 CONTINUES. THE SEVERE THREAT AND CORRESPONDING TORNADO RISK HAVE DIMINISHED CONSIDERABLY ACROSS THE UPPER OH VALLEY REGION. BOUNDARY LAYER DESTABILIZATION COINCIDENT WITH LOSS OF DAYTIME HEATING WILL ACT TO STRONGLY DIMINISH ANY REMAINING STRONG TO SEVERE TSTM RISK --WW 49 MAY BE ALLOWED TO EXPIRE PRIOR TO 02Z EXPIRATION TIME. LATEST SURFACE ANALYSIS SHOWS A PLUME OF HIGHER LOW LEVEL MOISTURE /CHARACTERIZED BY DEWPOINTS RANGING FROM 50 DEG N TO UPPER 50S S/ AHEAD OF A DRYLINE-LIKE FEATURE EXTENDING SW-NE NEAR THE I-71 CORRIDOR IN OHIO. WEAK SURFACE-BASED CAPE /AOB 500 J/KG PER PIT RAOB/-- WITHIN AN OTHERWISE STRONG SHEAR ENVIRONMENT-- WILL CONTINUE TO LESSEN WITH TIME. RADAR MOSAIC AND VISIBLE SATELLITE TRENDS HAVE SHOWN LITTLE IN THE WAY OF DEEPENING CONVECTIVE DEVELOPMENT ACROSS ERN OH --EXCEPT ACROSS NERN OH WHERE A FEW LOW TOPPED TSTMS HAVE DEVELOPED IN THE PAST HR. ASIDE FROM STRENGTHENING ASCENT --ASSOCIATED WITH A MID-LEVEL VORT LOBE PROGRESSING ACROSS IND INTO OHIO-- THAT MAY ACT TO PROLONG TSTM ACTIVITY ACROSS NERN OHIO INTO NWRN PA...STORM COVERAGE IS ANTICIPATED TO BE LOW THROUGH THE EARLY EVENING. ..SMITH.. 03/01/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...RNK...PBZ...RLX...CLE...ILN... LAT...LON 38298259 41278181 41478023 38377978 37368158 38298259
Nearby
Mesoscale Discussions in West Virginia, 2012Mesoscale Discussions in Ohio, 2012Mesoscale Discussions in Pennsylvania, 2012Every mesoscale discussion in 2012
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.