Alert archive / West Virginia / Mesoscale Discussions in 2012

Mesoscale Discussion 2092

October 30, 20126 states

The Storm Prediction Center issued this mesoscale discussion at Oct 30, 2012, 4:34 AM EDT for 6 states. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Oct 30, 2012, 4:34 AM EDT (08:34 UTC)
Expired: Oct 30, 2012, 8:30 AM EDT
In force: 4 hr
Issued by: the Storm Prediction Center

All 95 counties

Bath County, KY, Boyd County, KY, Breathitt County, KY, Carter County, KY, Elliott County, KY, Fleming County, KY, Floyd County, KY, Greenup County, KY, Johnson County, KY, Knott County, KY, Lawrence County, KY, Letcher County, KY, Lewis County, KY, Magoffin County, KY, Martin County, KY, Mason County, KY, Menifee County, KY, Morgan County, KY, Perry County, KY, Pike County, KY, Rowan County, KY, Wolfe County, KY, Garrett County, MD, Adams County, OH, Athens County, OH, Brown County, OH, Clark County, OH, Clinton County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Gallia County, OH, Greene County, OH, Highland County, OH, Hocking County, OH, Jackson County, OH, Lawrence County, OH, Licking County, OH, Madison County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Ross County, OH, Scioto County, OH, Union County, OH, Vinton County, OH, Washington County, OH, Fayette County, PA, Somerset County, PA, Buchanan County, VA, Dickenson County, VA, Wise 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, Harrison County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Logan County, WV, Marion County, WV, Mason County, WV, McDowell County, WV, Mingo County, WV, Monongalia County, WV, Nicholas County, WV, Pleasants County, WV, Preston County, WV, Putnam County, WV, Raleigh County, WV, Randolph County, WV, Ritchie County, WV, Roane 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, Wood County, WV, Wyoming County, WV

The radar

The Charleston,WV radar (KRLX), 92 km from the middle of the area, began a volume at 08:34 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

Pittsburgh, PA (KPIT), launched 00:00Z, 8.6 hours before the alert went out and 183 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 532 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 394 m²/s²
0-3 km storm-relative helicity: 524 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

267 
ACUS11 KWNS 300835
SWOMCD
SPC MCD 300834
PAZ000-WVZ000-MDZ000-OHZ000-VAZ000-KYZ000-301230-

MESOSCALE DISCUSSION 2092
NWS STORM PREDICTION CENTER NORMAN OK
0334 AM CDT TUE OCT 30 2012

AREAS AFFECTED...PARTS OF SWRN PA/S CENTRAL AND SERN OH/MUCH OF
WV/FAR WRN MD/NERN KY/PARTS OF SWRN VA

CONCERNING...HEAVY SNOW

VALID 300834Z - 301230Z

SUMMARY...HEAVY SNOWFALL IS FORECAST TO CONTINUE ACROSS WV AND
ADJACENT AREAS...AND CONTINUE TO INCREASE ACROSS PARTS OF OH AND
VICINITY OVER THE NEXT FEW HOURS...WITH RATES OF 1-2" PER HOUR
EXPECTED.

DISCUSSION...AS FORMER HURRICANE SANDY -- NOW CENTERED NEAR THE
PA/MD BORDER INVOF FDR -- CONTINUES MOVING SLOWLY WWD...PERSISTENT
PRECIPITATION CONTINUES ON THE WRN QUADRANT OF THE STORM WHERE WARM
ADVECTION/ISENTROPIC ASCENT IS MAXIMIZED.  THIS INCLUDES THE CENTRAL
APPALACHIANS AREA AND INTO THE OH VALLEY REGION.

PRECIPITATION ACROSS E CENTRAL AND NERN OH AND MOST OF WRN PA
REMAINS RAIN -- AS TEMPERATURES WARM WITH NWD EXTENT ACROSS THIS
REGION DUE TO AFOREMENTIONED WARM ADVECTION ARISING FROM ELY
LOW-LEVEL FLOW ON THE N SIDE OF THE SYSTEM.  HOWEVER...COOLER
TEMPERATURES -- WITH SOME MELTING-INDUCED COOLING INVOF BANDS OF
HEAVIER PRECIPITATION -- ARE OBSERVED ACROSS SRN AND WRN OH AND INTO
THE CENTRAL APPALACHIANS.  HERE....MODERATE SNOW IS
WIDESPREAD...WITH BANDS OF HEAVY SNOW INTERSPERSED.  THE
PRECIPITATION HAS INCREASED OVER THE PAST HOUR...AND EXPECT THIS
TREND TO CONTINUE AS WARM ADVECTION/ISENTROPIC ASCENT SPREAD SWWD.
GREATEST SNOWFALL AMOUNTS ARE FORECAST ON WWD-/NWWD-FACING SLOPES OF
HIGHER-ELEVATION AREAS...WHERE UPSLOPE FLOW AIDS ASCENT LOCALLY.

..GOSS.. 10/30/2012

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...CTP...LWX...RNK...PBZ...RLX...CLE...MRX...JKL...
ILN...

LAT...LON   39758107 39818015 40187950 40217909 40027880 39297921
            38447987 37698093 37038196 36918278 37068319 38138378
            39508400 40618359 40528314 39858178 39758107

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 30, 1:02 PM EDT	Mesoscale Discussion	SPC	Letcher, Pike	5 hr

Nearby

Mesoscale Discussions in West Virginia, 2012 Mesoscale Discussions in Ohio, 2012 Mesoscale Discussions in Kentucky, 2012 Every 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.