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Mesoscale Discussion 362
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   MESOSCALE DISCUSSION 0362
   NWS STORM PREDICTION CENTER NORMAN OK
   0647 AM CDT WED APR 16 2014

   AREAS AFFECTED...CENTRAL MN AND NWRN WI

   CONCERNING...HEAVY SNOW 

   VALID 161147Z - 161745Z

   SUMMARY...A WSW-ENE ORIENTED BAND OF SNOW...WITH RATES AROUND 1 INCH
   PER HOUR...IS EXPECTED TO DEVELOP DURING THE MID TO LATE MORNING
   ACROSS PORTIONS OF CENTRAL MN INTO NWRN WI...GENERALLY 20-30 MILES
   EITHER SIDE OF A LINE FROM 25 MI SE OF ALEXANDRIA MN TO 15 MI S OF
   ASHLAND WI.

   DISCUSSION...A SHORTWAVE TROUGH...CURRENTLY MOVING INTO CENTRAL
   SD/NRN NEB PER WATER VAPOR IMAGERY...WILL PROGRESS EWD THIS MORNING
   REACHING ERN SD BY 18Z.  AT 11Z...AN ATTENDANT SURFACE LOW WAS
   LOCATED IN SRN SD BETWEEN 9V9 AND MHE...WITH A WARM FRONT EXTENDING
   EWD INTO FAR SWRN MN AND THEN SEWD INTO EAST CENTRAL IA.  THIS
   BOUNDARY WILL CONTINUE TO ADVANCE NWD INTO SRN MN THIS MORNING AS
   THE SURFACE LOW TRACKS INTO FAR NWRN IA BY EARLY AFTERNOON.  SOME
   AMPLIFICATION OF THE SHORTWAVE TROUGH IS EXPECTED AS THIS SYSTEM
   BECOMES MORE NEUTRALLY ORIENTED AND SUBSEQUENTLY SUSTAINS A 50-65 KT
   SSWLY LLJ THAT CURRENTLY EXTENDS INTO CENTRAL IA.  THE NOSE OF THIS
   LLJ WILL SHIFT INTO SRN/CENTRAL MN AND FAR NWRN WI BETWEEN 15-18Z
   WITH STRONG LOW-LEVEL WAA DEVELOPING ACROSS THE DISCUSSION AREA. 
   UPWARD VERTICAL MOTION WILL BE FURTHER ENHANCED DURING THIS TIME
   PERIOD WITH THE APPROACH OF THE MIDLEVEL TROUGH AND AS THE EXIT
   REGION OF AN ACCOMPANYING 50-60 KT SWLY JET STREAK REACHES CENTRAL
   MN/NWRN WI.  FORECAST SOUNDINGS SUGGEST THE INCREASING UVVS SHOULD
   OCCUR WITHIN THE DENDRITIC GROWTH ZONE OF A MOIST PROFILE...
   ESPECIALLY BY LATE MORNING...WHILE THE THERMODYNAMIC PROFILE FROM
   THE SURFACE TO 3 KM WILL AT TIMES BE ISOTHERMAL SUPPORTING AN
   AGGREGATION PROCESS.

   ..PETERS.. 04/16/2014


   ATTN...WFO...DLH...MPX...

   LAT...LON   46719234 46669123 46519067 46329034 46149026 46009075
               46039139 45969200 45749274 45509386 45369457 45189521
               45229574 45659554 46159499 46599358 46719234 

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Page last modified: April 16, 2014
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