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Mesoscale Discussion 87
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   MESOSCALE DISCUSSION 0087
   NWS STORM PREDICTION CENTER NORMAN OK
   0143 AM CST WED FEB 12 2014

   AREAS AFFECTED...FAR NE AL...NRN AND CNTRL GA...MUCH OF SC

   CONCERNING...WINTER MIXED PRECIPITATION 

   VALID 120743Z - 121345Z

   SUMMARY...RAIN HAS BEGUN TO TRANSITION TO FREEZING RAIN ACROSS
   PORTIONS OF NE GA INTO SC. THIS TRANSITION WILL CONTINUE...WITH
   FREEZING RAIN DEVELOPING SOUTHWARD ACROSS THE MCD AREA. FURTHER
   NORTH ACROSS PARTS OF NE GA INTO NW SC...HEAVY SNOW /RATES NEAR 1 IN
   PER HR/ WILL BE THE MAIN CONCERN. EXPECT HEAVY FREEZING RAIN /RATES
   NEAR 0.05-0.10 IN PER HOUR/ AND SNOW TO BE ONGOING ACROSS THE
   DISCUSSION AREA BY 09-12Z.

   DISCUSSION...COLD...DRY ADVECTION ON NELY LOW-LEVEL FLOW WILL
   CONTINUE ACROSS THE DISCUSSION AREA OVERNIGHT. AS WARM/MOIST AIRMASS
   OVERRIDES COOLER NEAR-SFC LAYER AND A WEAK SHORTWAVE IMPULSE
   TRAVERSES ACROSS THE REGION...PRECIPITATION RATES WILL INCREASE. WET
   BULB PROCESSES COMBINED WITH LOW-LEVEL COLD ADVECTION WILL ALLOW
   TEMPERATURES TO FALL BELOW FREEZING AND RAIN WILL TRANSITION TO
   FREEZING RAIN ACROSS PARTS OF NRN AND CNTRL GA INTO CNTRL/ERN SC.
   FURTHER NORTH...DEEP-LAYER TEMPERATURES WILL BE COLD ENOUGH FOR
   MAINLY SNOW /HEAVY AT TIMES/ FROM NE GA INTO NW SC. 

   THE TRANSITION FROM SNOW TO FREEZING RAIN WILL LIKELY BE IN A NARROW
   CORRIDOR FROM NEAR KAHN EWD TOWARD KCAE. HEAVY SNOW IS LIKELY NORTH
   OF THIS LINE...AND HEAVY FREEZING RAIN /POTENTIALLY MIXED WITH
   SLEET/ ALONG AND SOUTH OF THE KAHN TO KCAE CORRIDOR. 06Z RAOBS FROM
   CHS AND JAN INDICATED PW VALUES NEAR 1 INCH. THESE VALUES LIKELY
   DROP OFF SOME WITH NWD EXTENT...BUT SUFFICIENT MOISTURE WILL BE
   PRESENT TO SUPPORT SEVERAL HOURS OF HEAVY FREEZING RAIN /SNOW
   NORTH/...LEADING TO POTENTIALLY SIGNIFICANT IMPACTS IN THE VICINITY
   OF THE I-20 CORRIDOR FROM CNTRL GA INTO CNTRL/ERN SC BY 12Z.

   ..LEITMAN.. 02/12/2014


   ATTN...WFO...ILM...CHS...CAE...GSP...MRX...FFC...BMX...HUN...

   LAT...LON   32908464 33508542 34128583 34458590 34828578 34968540
               35078464 35058372 34908239 34538027 34217904 33897885
               33387909 33027943 32808036 32628107 32508202 32538283
               32658387 32908464 

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