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Mesoscale Discussion 90
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   MESOSCALE DISCUSSION 0090
   NWS STORM PREDICTION CENTER NORMAN OK
   0318 AM CST WED JAN 30 2013
   
   AREAS AFFECTED...SW...CNTRL...AND NE IA
   
   CONCERNING...HEAVY SNOW 
   
   VALID 300918Z - 301415Z
   
   SUMMARY...AN INTENSIFICATION OF SNOWFALL RATES IS FORECAST TO OCCUR
   ACROSS PARTS OF CNTRL AND NE IA OVER THE NEXT 2-3 HRS. RATES OF
   1-1.5 INCHES PER HR WILL BE POSSIBLE.
   
   DISCUSSION...RADAR MOSAIC SHOWS WIDESPREAD LIGHT TO MODERATE
   SNOWFALL OCCURRING ACROSS MUCH OF IA. HEAVIER SNOWFALL RATES ARE
   LIKELY ACCOMPANYING A SW-NE ORIENTED BAND LOCATED FROM 25 SE OMA TO
   NEAR MCW AS OF 09Z...AND WILL SLOWLY PROGRESS E-NEWD. THIS IS
   OCCURRING ALONG THE N/W PERIPHERY OF A PROMINENT MID-LEVEL
   CYCLONE...CENTERED NEAR KMCI AS OF 09Z PER WATER VAPOR
   IMAGERY...CONCOMITANT WITH AN UPPER LEVEL DEFORMATION ZONE. AS THIS
   SYSTEM SHIFTS NEWD...HEAVY SNOWFALL RATES ARE FORECAST TO BECOME
   MORE WIDESPREAD. BOTH 07Z RAP AND 06Z NAM FORECAST SOUNDINGS
   INDICATE COLUMNAL COOLING WILL CONTINUE OVER THE NEXT 3-6 HRS ACROSS
   THIS AREA...WITH A SUBSEQUENT DEEPENING OF THE DENDRITIC GROWTH
   LAYER...AND SHOULD SUPPORT SNOWFALL RATES OF 1-1.5 INCHES PER HR.
   ADDITIONALLY...BRISK NLY WINDS OF 20-25 MPH COULD LEAD TO TEMPORARY
   REDUCTIONS IN VISIBILITY.
   
   ..ROGERS.. 01/30/2013
   
   ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
   
   ATTN...WFO...DVN...ARX...DMX...OAX...
   
   LAT...LON   42939134 41769272 40829406 40659540 41099567 41859513
               43109393 43409338 43459288 43419193 43349152 42939134 
   
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