MESOSCALE DISCUSSION 0055
   NWS STORM PREDICTION CENTER NORMAN OK
   0640 AM CST WED JAN 28 2009
   
   AREAS AFFECTED...SERN IND...NRN KY...OH...NWRN PA...WV PANHANDLE
   
   CONCERNING...WINTER MIXED PRECIPITATION 
   
   VALID 281240Z - 281715Z
   
   MAJOR WINTER STORM WILL SUBSIDE FROM WEST TO EAST ACROSS THE OH
   VALLEY THIS MORNING. AN AXIS OF FREEZING RAIN AND SLEET FROM
   LOUISVILLE KY TO YOUNGSTOWN OH WITH LIQUID-EQUIVALENT RATES OF 0.05
   TO 0.10 IN/HR WILL TRANSITION TO SNOW. MODERATE TO LOCALLY HEAVY
   SNOW FROM NEAR EVANSVILLE IND TO CLEVELAND OH /WITH RATES REACHING 1
   IN/HR AT TIMES/...WILL SHIFT EWD PRIOR TO ENDING BY 18Z.
   
   12Z SUBJECTIVE SURFACE ANALYSIS PLACES AN INTENSIFYING CYCLONE
   /CHARACTERIZED BY 5 MB FALLS IN THE PAST 6 HR/ NEAR CRW. LATEST
   ECMWF/GFS/RUC SUGGEST THIS DEEPENING TREND WILL CONTINUE AS THE LOW
   REACHES DUJ AT 18Z...WITH STRONG HEIGHT FALLS DOWNSTREAM OF VIGOROUS
   SHORT WAVE TROUGH /CURRENTLY CROSSING THE MID-MS VALLEY PER WATER
   VAPOR IMAGERY/. THIS WILL HELP STRENGTHEN LOWER-LEVEL
   CAA...RESULTING IN A TRANSITION OF ONGOING FREEZING RAIN AND SLEET
   TO SNOW AS THE THERMODYNAMIC PROFILE COOLS TO AOB FREEZING.
   
   FARTHER WEST...WHERE MODERATE TO LOCALLY HEAVY SNOW HAS PERSISTED
   WITH REPORTED SNOWFALL RATES OF 1 IN/HR AT TIMES...RAPID MID-LEVEL
   SUBSIDENCE/DRYING WILL OCCUR AS SHORT WAVE TROUGH AXIS QUICKLY
   PASSES E/NEWD...AS NOTED IN UPSTREAM 12Z RAOBS. THIS WILL BRING AN
   ABRUPT CESSATION TO HEAVIER SNOWFALL RATES BY 18Z.
   
   ..GRAMS.. 01/28/2009
   
   
   ...NOTICE...
   SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A
   SCHEDULED BASIS FROM DECEMBER 1 THROUGH FEBRUARY 28...FOUR
   TIMES A DAY...AROUND 00 UTC...06 UTC...12 UTC...AND 18 UTC
   FOR SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS.
   
   ATTN...WFO...PBZ...RLX...CLE...JKL...ILN...LMK...IND...PAH...
   
   LAT...LON   40798001 40198060 39258212 38368376 37338616 37818715
               38588647 40158407 41368242 41758134 42108021 41917981
               41527976 40798001