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Mesoscale Discussion 66
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   MESOSCALE DISCUSSION 0066
   NWS STORM PREDICTION CENTER NORMAN OK
   0316 PM CST TUE FEB 04 2014

   AREAS AFFECTED...MUCH OF IND...WRN AND NRN OH...FAR ERN IL

   CONCERNING...HEAVY SNOW 

   VALID 042116Z - 050315Z

   CORRECTED FOR TEXT ERROR

   SUMMARY...SNOWFALL RATES ARE EXPECTED TO RAPIDLY INCREASE ACROSS IND
   INTO PARTS OF OH THIS EVENING...WITH 1-2 INCHES PER HR BECOMING
   COMMON. THIS THREAT WILL LIKELY INCLUDE THE INDIANAPOLIS AND DAYTON
   METRO AREAS.

   DISCUSSION...HEAVY SNOWFALL WILL BECOME COMMON THROUGH 00Z ACROSS
   SRN/CNTRL IND...AND EVENTUALLY INTO WRN/NRN OH. THIS WILL OCCUR
   ALONG THE NRN FRINGE OF A SWATH OF HEAVY PRECIPITATION...ASSOCIATED
   WITH THE WARM CONVEYOR REGION OF AN UPSTREAM CYCLONE OVER THE CNTRL
   PLAINS. AS THIS SYSTEM GRADUALLY ACCELERATES NEWD AND ACQUIRES A
   SLIGHT NEGATIVE TILT...A SUBSEQUENT INCREASE IN DEEP-LAYER WIND
   FIELDS IS FORECAST TO OCCUR INVOF THE OH VALLEY. 

   FRONTOGENESIS IN THE 800-700 MB LAYER WILL BECOME MAXIMIZED JUST N
   OF THE OH RIVER BY EARLY EVENING ALONG THE EXIT REGION OF A
   LLJ...AND WILL COMBINE WITH STRENGTHENING ISENTROPIC ASCENT AND
   UPPER DIVERGENCE TO SUPPORT AN INCREASE IN PRECIPITATION RATES.
   ADDITIONALLY...THE AIR MASS REMAINS ANOMALOUSLY MOIST...WITH PW
   VALUES GENERALLY RANGING FROM 0.7-0.9 INCH. AS SUCH...RATES OF 1-2
   PER INCHES PER HR WILL BECOME INCREASINGLY LIKELY INTO THE EVENING
   HRS /ESPECIALLY WITHIN CONCENTRATED SNOW BANDS/...AFFECTING THE
   INDIANAPOLIS AND DAYTON METRO AREAS...AS WELL AS SURROUNDING
   PORTIONS OF SRN/CNTRL IND AND W-CNTRL/NWRN OH.

   ..ROGERS.. 02/04/2014


   ATTN...WFO...CLE...ILN...IWX...IND...ILX...

   LAT...LON   41628434 41588262 40318274 39538433 39178543 38828654
               38658727 38638786 39288805 40348730 41038540 41628434 

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Page last modified: March 20, 2014
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