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000
ACUS11 KWNS 050400
SWOMCD
SPC MCD 050400
WVZ000-MDZ000-PAZ000-OHZ000-KYZ000-051000-

MESOSCALE DISCUSSION 0121
NWS STORM PREDICTION CENTER NORMAN OK
1000 PM CST WED MAR 04 2015

AREAS AFFECTED...PORTIONS OF CNTRL/ERN KY...SRN OH...WV...SWRN
PA...FAR WRN MD

CONCERNING...HEAVY SNOW

VALID 050400Z - 051000Z

SUMMARY...AREAS OF HEAVY SNOW WILL BE SPREADING ENEWD ACROSS
PORTIONS OF THE MIDDLE AND UPPER OHIO VALLEY THROUGHOUT THE
OVERNIGHT HOURS. SNOWFALL RATES OF 1 INCH PER HOUR WILL BE POSSIBLE
ACROSS THE AREA.

DISCUSSION...AN EXTENSIVE BAND OF LOW/MID-LEVEL FRONTOGENETIC ASCENT
ACCOMPANYING A BROAD BAROCLINIC ZONE DRAPED WSW/ENE ACROSS THE
REGION WILL FOSTER CONTINUED PRECIPITATION OVERNIGHT. REPORTS OF
MODERATE TO HEAVY SNOW CONTINUE ACROSS PARTS OF CNTRL KY TOWARD THE
OHIO RIVER VICINITY. CONVECTIVE PROCESSES UPSTREAM TOWARD THE
MID-SOUTH AND ARKLATEX WILL MAINTAIN A FEED OF PRECIPITATION INTO
THE REGION FROM THE SW...EMBEDDED WITHIN THE BROADER WARM CONVEYOR
STRUCTURE ON THE ERN PERIPHERY OF CNTRL-CONUS MIDLEVEL TROUGHING PER
WATER VAPOR LOOPS. GIVEN THE STEEPER FRONTAL SURFACE N OF THE TN
VALLEY/MID-SOUTH REGION...DEEPER SUBFREEZING AIR THROUGH THE
TROPOSPHERE WILL SUPPORT MAINLY SNOW ACROSS THE REGION. ANY ONGOING
RAIN FROM ERN KY TO NRN WV SHOULD TRANSITION TO SNOW THROUGH 06Z
OWING TO THE COMBINED EFFECTS OF LOW-LEVEL COLD ADVECTION AND
NOCTURNAL DIABATIC COOLING. SNOWFALL RATES OF 1 INCH PER HOUR WILL
BE POSSIBLE OVERNIGHT TONIGHT...WITH SLEET POSSIBLE DURING THE
TRANSITION PERIOD TO SNOW IN SOME LOCATIONS.

..COHEN.. 03/05/2015

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

ATTN...WFO...LWX...PBZ...RLX...JKL...ILN...LMK...

LAT...LON   37218378 36798647 37788638 39748181 39917989 39557909
            38907920 38158086 37218378