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Mesoscale Discussion 10
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   MESOSCALE DISCUSSION 0010
   NWS STORM PREDICTION CENTER NORMAN OK
   0143 PM CST WED JAN 08 2014

   AREAS AFFECTED...WRN/NWRN AR AND EXTREME ERN OK

   CONCERNING...FREEZING RAIN 

   VALID 081943Z - 082345Z

   SUMMARY...LIGHT FREEZING RAIN/DRIZZLE WILL CONTINUE THROUGH THE
   AFTERNOON...WITH PEAK HOURLY ACCUMULATIONS OF 0.02-0.05 INCHES.

   DISCUSSION...DESPITE A LARGER-SCALE WAA REGIME...THE ARCTIC AIR MASS
   HAS BEEN SLOW TO ERODE ACROSS THE OZARKS.  A RESIDUAL NEAR-SURFACE
   SUB-FREEZING AIR MASS IS BEING MAINTAINED AS LIGHT PRECIPITATION
   FALLS INTO THE PREVIOUSLY DRY BOUNDARY LAYER.  TERRAIN INFLUENCES
   AND CONTINUED DEVELOPMENT OF LIGHT PRECIPITATION ALONG THE AXIS OF
   STRONGEST MOISTURE RETURN/WAA JUST ABOVE THE SURFACE WILL HELP
   MAINTAIN A SHALLOW LAYER OF 30-32 F TEMPERATURES NEAR THE
   SURFACE...RESULTING IN FREEZING RAIN/DRIZZLE AS THE PRIMARY
   PRECIPITATION TYPE.  THROUGH NEAR-SURFACE AIR TEMPERATURES AND
   PRECIPITATION RATES WILL BE MARGINAL FOR SIGNIFICANT ICE
   ACCUMULATION...EXPOSED SURFACES AND VEGETATION ARE RELATIVELY COLD
   AS A RESULT OF THE PRIOR ARCTIC INTRUSION.  THUS...WHAT
   PRECIPITATION FALLS MAY TEND TO FREEZE ON EXPOSED SURFACES MORE
   EFFICIENTLY THAN NORMALLY EXPECTED FOR THE OBSERVED RANGE OF
   TEMPERATURES.

   ..THOMPSON.. 01/08/2014


   ATTN...WFO...LZK...SGF...SHV...TSA...

   LAT...LON   35719214 35149250 34669280 34299298 34109327 34049379
               34069437 34209480 34439498 34629463 34849424 35319415
               35589485 35789483 36039414 36499311 36639261 36639214
               36439195 36109195 35719214 

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Page last modified: March 20, 2014
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