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Mesoscale Discussion 62
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   MESOSCALE DISCUSSION 0062
   NWS STORM PREDICTION CENTER NORMAN OK
   0545 AM CST TUE FEB 04 2014

   AREAS AFFECTED...WRN AND NRN AR...EXTREME E CENTRAL OK

   CONCERNING...FREEZING RAIN 

   VALID 041145Z - 041645Z

   SUMMARY...FREEZING RAIN WILL INCREASE IN COVERAGE/INTENSITY ACROSS
   AR THROUGH THE MORNING...WITH HOURLY PRECIPITATION RATES REACHING
   0.20" OR MORE.  THE GREATER ICE ACCUMULATIONS WILL OCCUR ON ELEVATED
   SURFACES FROM W CENTRAL INTO N CENTRAL AR.

   DISCUSSION...PRECIPITATION IS EXPANDING QUICKLY OVER ERN OK/WRN AR
   IN A ZONE OF STRENGTHENING LOW-LEVEL WAA ON THE NOSE OF A 40+ KT
   LLJ.  A SURGE OF LOW-MIDLEVEL MOISTURE ALONG THE LLJ
   CORRIDOR...COMBINED WITH WEAK MIDLEVEL BUOYANCY...WILL SUPPORT
   INTENSIFYING PRECIPITATION RATES THROUGH THE MORNING WITH EMBEDDED
   CONVECTION.  MEANWHILE... THERMODYNAMIC PROFILES WILL FAVOR FREEZING
   RAIN AS THE DOMINANT PRECIPITATION TYPE AS A RESIDUAL COLD BOUNDARY
   LAYER WILL PERSIST BENEATH THE DEVELOPING WARM CONVEYOR BELT.  THE
   GREATER ICE ACCUMULATIONS THIS MORNING ARE EXPECTED FROM W CENTRAL
   TO N CENTRAL AR /GENERALLY W AND N OF LITTLE ROCK/...WHERE OVERNIGHT
   SURFACE TEMPERATURES DROPPED INTO THE MID-UPPER 20S...AND THE
   SUB-FREEZING BOUNDARY LAYER WILL PERSIST THROUGH MUCH OF THE
   PRECIPITATION EVENT.

   ..THOMPSON.. 02/04/2014


   ATTN...WFO...MEG...LZK...TSA...

   LAT...LON   35739123 35239150 34809190 34579233 34429283 34389357
               34689429 35069471 35519507 35959496 36259432 36429315
               36399194 36159139 35739123 

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Page last modified: February 04, 2014
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