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Mesoscale Discussion 121
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   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


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

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

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Page last modified: March 05, 2015
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