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Mesoscale Discussion 55
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   MESOSCALE DISCUSSION 0055
   NWS STORM PREDICTION CENTER NORMAN OK
   0547 PM CST FRI JAN 22 2016

   AREAS AFFECTED...PORTIONS OF WV...WRN VA...WRN MD

   CONCERNING...HEAVY SNOW 

   VALID 222347Z - 230445Z

   SUMMARY...A BAND OF HEAVY SNOW WILL DEVELOP NORTHWARD ACROSS WESTERN
   VA INTO EASTERN WV AND WESTERN MD OVER THE NEXT FEW HOURS. SNOWFALL
   RATES OF 1-2 INCHES PER HR /WITH LOCALIZED RATES UPWARDS OF 2-3
   INCHES PER HR/ WILL BE POSSIBLE.

   DISCUSSION...WATER-VAPOR IMAGERY AND THE REGIONAL RADAR MOSAIC
   SUGGEST A BAND OF HEAVY SNOW IS BLOSSOMING ACROSS THE MCD AREA IN
   RESPONSE TO INCREASING LARGE-SCALE ASCENT...AS AN IMPULSE OVER THE
   SRN APPALACHIANS CONTINUES TO ROTATE AROUND THE PERIPHERY OF THE
   MATURING UPPER TROUGH. STRENGTHENING WAA AT LOW/MID LEVELS...IN
   COMBINATION WITH ENHANCED FRONTOGENETIC CIRCULATIONS...WILL FAVOR A
   BAND OF HEAVY SNOWFALL RATES THIS EVENING. ADDITIONALLY...LAST
   VISIBLE IMAGES PRIOR TO NIGHTFALL INDICATED SMALL CONVECTIVE
   ELEMENTS WITHIN THIS GROWING SNOW BAND...FAVORING ENHANCED RATES.
   DUAL-POL ZDR AND KDP DATA FROM KFCX CONFIRM THAT DEEPER/STRONGER
   CRYSTAL GENERATION ALOFT IS OVERSPREADING THE REGION...IN RESPONSE
   TO INCREASING ASCENT WITHIN THE -10 TO -20 C LAYER. KRLX ALSO
   DEPICTS SUCH SIGNATURES TO ITS EAST AND NORTHEAST. EFFICIENT CRYSTAL
   GENERATION AND THEN AGGREGATION BENEATH THAT LAYER WILL FAVOR VERY
   HEAVY SNOW AT TIMES...WITH LOCALIZED RATES UPWARDS OF 3 INCHES PER
   HOUR AND LOW VISIBILITIES THIS EVENING.

   ..PICCA.. 01/22/2016


   ATTN...WFO...LWX...RNK...PBZ...RLX...

   LAT...LON   37258092 38508060 39248030 39587965 39587806 39197796
               38407873 37147914 36707970 36728037 36828073 37258092 

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Page last modified: January 23, 2016
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