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Mesoscale Discussion 133
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   MESOSCALE DISCUSSION 0133
   NWS STORM PREDICTION CENTER NORMAN OK
   0458 AM CDT MON MAR 23 2015

   AREAS AFFECTED...FAR SRN WI...NRN IL...NW IND

   CONCERNING...HEAVY SNOW 

   VALID 230958Z - 231430Z

   SUMMARY...A BURST OF HEAVY SNOW WILL MOVE FROM SW WI ACROSS
   N-CNTRL/NE IL INTO NWRN IND THROUGH MIDDAY. WHILE OVERALL INTENSITY
   SHOULD GRADUALLY SUBSIDE LATE THIS MORNING...AROUND 1 TO LOCALLY 2
   IN/HR RATES ARE EXPECTED DURING THE MORNING COMMUTE INCLUDING
   CHICAGOLAND.

   DISCUSSION...LATEST METARS CONFIRM A BAND OF HEAVY SNOW ACROSS SW WI
   WHICH HAS BEEN COINCIDENT WITH SPORADIC LIGHTNING STRIKES DURING THE
   PAST HOUR PER NLDN. AMDAR DATA INVOF CHICAGOLAND SUPPORTS AN ALL
   BELOW-FREEZING THERMAL PROFILE ACROSS THE NRN/ERN PORTION OF THE
   MIXED PRECIP SWATH IN ASSOCIATION WITH A SHORTWAVE IMPULSE SHIFTING
   E/SE FROM THE UPPER MS VALLEY TOWARD THE MIDWEST. 40-50 KT LOW-LEVEL
   S/SWLYS HAVE BEEN PREVALENT IN VWP DATA AT EAX/DMX/ILX YIELDING
   STRONG WAA/FRONTOGENETICAL ASCENT. GUIDANCE IS CONSISTENT IN
   WEAKENING WINDS SLOWLY AFTER DAYBREAK WHICH WILL EVENTUALLY RESULT
   IN MORE MODERATE SNOWFALL RATES TOWARDS 18Z. UNTIL THAT
   OCCURS...EXPECT THE BURST OF HEAVY SNOW TO SHIFT SEWD AND AFFECT THE
   ROCKFORD/CHICAGO METRO AREAS DURING THE MORNING COMMUTE.

   ..GRAMS.. 03/23/2015


   ATTN...WFO...IWX...IND...LOT...MKX...DVN...

   LAT...LON   42639016 42908974 42738851 42398773 41718646 41208629
               40808637 40678665 40818720 41128783 41658912 42329008
               42639016 

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Page last modified: March 23, 2015
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