SPC MD 55

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MD 0055 CONCERNING HEAVY SNOW FOR PORTIONS OF WV…WRN VA…WRN MD
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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  ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...  ATTN...WFO...LWX...RNK...PBZ...RLX...  LAT...LON   37258092 38508060 39248030 39587965 39587806 39197796             38407873 37147914 36707970 36728037 36828073 37258092   

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