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Mesoscale Discussion 259
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   MESOSCALE DISCUSSION 0259
   NWS STORM PREDICTION CENTER NORMAN OK
   0939 PM CDT WED MAR 23 2016

   AREAS AFFECTED...PORTIONS OF CNTRL/ERN WI EWD TO NRN LOWER MI

   CONCERNING...HEAVY SNOW 

   VALID 240239Z - 240845Z

   SUMMARY...BANDS OF MODERATE TO HEAVY SNOW...WITH SNOWFALL RATES TO 1
   INCH PER HOUR...WILL CONTINUE THROUGH THE LATE EVENING AND OVERNIGHT
   HOURS.

   DISCUSSION...A LOOP OF MOSAIC RADAR INDICATES PRECIPITATION BANDS
   BECOMING BETTER DEFINED FROM THE WAUSAU WI AREA EWD TOWARD THE
   ALPENA MI AREA...WITH ANOTHER BAND BECOMING ESTABLISHED FARTHER S
   ACROSS PARTS OF CNTRL WI THROUGH THE GREEN BAY AREA AND EWD TO THE N
   END OF SAGINAW BAY. THIS ACTIVITY LIES WITHIN A DEFORMATION ZONE
   ALOFT EXTENDING WELL TO THE ENE OF A COMPACT MID-LEVEL CYCLONE
   CROSSING THE CNTRL CONUS PER A WATER VAPOR LOOP.

   FRONTOGENETIC CIRCULATIONS EXTENDING INTO A SATURATED DENDRITIC
   GROWTH ZONE ALOFT ARE ALREADY SUPPORTING MODERATE TO LOCALLY HEAVY
   SNOW WITHIN THE AFOREMENTIONED BANDS. PERSISTENT LOW/MID-LEVEL
   FRONTOGENESIS AND INCREASING WAA OWING TO THE APPROACH OF THE
   CYCLONE THROUGH THE NIGHT WILL FACILITATE THEIR SUSTENANCE AND
   PERHAPS INTENSIFICATION AMIDST DEEP SUB-FREEZING AIR. MODERATE TO
   HEAVY SNOW WILL LIKELY INCREASE IN COVERAGE...AS WELL.

   EVENTUALLY...A MASS OF CONVECTIVELY ENHANCED PRECIPITATION PRESENTLY
   CROSSING IA WILL MERGE WITH THE PERSISTENT...MORE-STRATIFORM...
   AFOREMENTIONED PRECIP AND ALSO SUPPORT MODERATE TO HEAVY SNOW
   THROUGH THE OVERNIGHT HOURS.

   SNOWFALL RATES TO 1 INCH PER HOUR WILL BE POSSIBLE WITH THE HEAVIEST
   SNOW THROUGH TONIGHT. WARMING ALOFT ASSOCIATED WITH ELEVATED WAA MAY
   ALSO BE SUFFICIENT FOR FREEZING RAIN AND/OR SLEET TO MIX WITH THE
   PRECIPITATION FROM PARTS OF CNTRL WI TO CNTRL LOWER MI BY LATE
   TONIGHT. ALSO OF NOTE...STRONG WINDS MAY RESULT IN SUBSTANTIALLY
   REDUCED VISIBILITY WITH BLOWING/DRIFTING SNOW ACROSS PARTS OF ERN 
   WI -- PARTICULARLY NEAR THE COAST.

   ..COHEN.. 03/24/2016


   ATTN...WFO...APX...GRR...MQT...GRB...MKX...ARX...

   LAT...LON   44068470 44118653 43898812 43598939 43868990 44288998
               44788978 45188920 45448728 45468457 45328344 44858300
               44348294 44118345 44068470 

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Page last modified: March 24, 2016
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