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Mesoscale Discussion 86
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   MESOSCALE DISCUSSION 0086
   NWS STORM PREDICTION CENTER NORMAN OK
   0630 PM CST TUE FEB 11 2014

   AREAS AFFECTED...PARTS OF CNTRL LA INTO SWRN THRU E CNTRL MS

   CONCERNING...FREEZING RAIN 

   VALID 120030Z - 120230Z

   SUMMARY...SIGNIFICANT ICING IN EXCESS OF 1/4 INCH APPEARS POSSIBLE
   ACROSS THE REGION BETWEEN NOW AND 02-04Z.

   DISCUSSION...WITHIN A LARGER AREA OF GENERAL ISENTROPIC ASCENT NOW
   DEVELOPING EASTWARD THROUGH THE LOWER MISSISSIPPI VALLEY...A BAND OF
   HEAVIER RAINFALL APPEARS TO BE IN THE PROCESS OF DEVELOPING ALONG AN
   AXIS FROM NEAR ALEXANDRIA LA THROUGH AREAS NEAR/SOUTH OF JACKSON
   MS...INTO THE MERIDIAN MS AREA.  THIS MAY BE IN RESPONSE TO
   LOWER/MID TROPOSPHERIC FRONTOGENETIC FORCING...IN THE PRESENCE OF
   SUFFICIENT INSTABILITY TO SUPPORT CONVECTION...INCLUDING WEAK
   THUNDERSTORM ACTIVITY. BETWEEN NOW AND 02-04Z...OCCASIONAL MODERATE
   TO HEAVY RAIN RATES YIELDING TOTALS IN EXCESS OF 1/4 INCH APPEAR
   PROBABLE.  OF PRIMARY CONCERN IS THE SHALLOW SUB-FREEZING SURFACE
   BASED LAYER WHICH HAS ADVECTED AS FAR SOUTH AS THIS ZONE...WHICH
   COULD ALLOW FOR ACCUMULATING ICE ON VEGETATION AND OTHER EXPOSED
   OBJECTS AND SURFACES.  ALTHOUGH GROUND TEMPERATURES ARE RELATIVELY
   WARM... AND AIR TEMPERATURES ARE NOT EXPECTED TO FALL MUCH BELOW
   FREEZING...AMONG ROAD SURFACES...AT LEAST BRIDGES/OVERPASSES MAY BE
   IMPACTED.

   ..KERR.. 02/12/2014


   ATTN...WFO...JAN...LIX...LCH...SHV...

   LAT...LON   31329303 32079170 32738954 32848872 31878904 31299077
               30899219 31089276 31329303 

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Page last modified: February 12, 2014
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