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Mesoscale Discussion 283
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   MESOSCALE DISCUSSION 0283
   NWS STORM PREDICTION CENTER NORMAN OK
   0437 AM CDT FRI APR 04 2014

   AREAS AFFECTED...PORTIONS OF CNTRL/NRN WI...CNTRL/WRN UPPER
   PENINSULA OF MI...FAR ERN MN

   CONCERNING...HEAVY SNOW 

   VALID 040937Z - 041530Z

   SUMMARY...THE POTENTIAL FOR HEAVY SNOW WILL SPREAD NEWD THROUGH THE
   MORNING.

   DISCUSSION...MODERATE TO HEAVY SNOW WITHIN A WARM ADVECTION REGIME
   WILL CONTINUE ADVANCING NEWD FROM THE LAKE SUPERIOR COAST IN NRN WI
   AND THE UPPER PENINSULA OF MI. MEANWHILE...WATER VAPOR IMAGERY
   INDICATES A VIGOROUS MID-LEVEL VORT MAX LIFTING NEWD ACROSS PARTS OF
   IA INTO MN/WI. ELEVATED MOISTURE RETURN WITHIN THE WARM CONVEYOR
   BELT IS SEEDING THE COMMA HEAD NE OF THE VORT MAX. THIS HAS YIELDED
   A RECENT UPTICK IN PRECIPITATION FROM SWRN WI INTO SERN MN WITH
   ISOLATED LIGHTNING STRIKES. THIS ACTIVITY WILL SPREAD NEWD WITH
   TIME...WHILE FRONTOGENESIS WITHIN THE DEFORMATION ZONE OF THE DEEP
   CYCLONE BOLSTERS LOW/MID-LEVEL ASCENT. AND...WITH SUBFREEZING
   TEMPERATURES THROUGHOUT THE TROPOSPHERE ACROSS MUCH OF THE
   AREA...HEAVY SNOW WITH RATES AROUND 1 INCH PER HOUR WILL BE OF
   CONCERN. SLIGHTLY WARMER PROFILES ALOFT COULD SUPPORT AREAS OF
   FREEZING RAIN/SLEET ACROSS PARTS OF CNTRL WI. HOWEVER...A CHANGEOVER
   TO SNOW SHOULD OCCUR LATER THIS MORNING AS COLD ADVECTION IS
   ENHANCED ON THE BACKSIDE OF A SFC CYCLONE ADVANCING NEWD ACROSS
   PARTS OF SRN WI.

   ..COHEN.. 04/04/2014


   ATTN...WFO...MQT...GRB...DLH...ARX...MPX...

   LAT...LON   45939272 47459155 47958946 47518764 46378733 45128802
               44498950 44329181 44799282 45939272 

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Page last modified: April 04, 2014
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