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Mesoscale Discussion 91
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   Mesoscale Discussion 0091
   NWS Storm Prediction Center Norman OK
   0206 PM CST Sat Jan 21 2017

   Areas affected...portions of southeast GA into southeast SC

   Concerning...Tornado Watch 13...

   Valid 212006Z - 212130Z

   The severe weather threat for Tornado Watch 13 continues.

   SUMMARY...The tornado and damaging wind threat will continue across
   WW 13 this afternoon. A greater tornado threat may be developing
   across portions southeast GA into southeast SC in the vicinity of
   the Savannah River Valley and coastal plain.

   DISCUSSION...There has been an increase in coverage and intensity
   during the last hour or so of low level rotation signatures near the
   Savannah River. Latest surface analysis and investigation of
   regional VWP data shows that some backing of low level winds has
   enhance 0-1km shear in this vicinity.  This area, indicated by the
   black hatched area in the MCD graphic, may have a greater tornado
   and widespread wind damage threat than further south along the ling
   where low level flow has veered. That aside, damaging winds also
   will still be possible within the entire watch area. Some local
   aerial extension of the watch my be necessary over parts of SC and
   far southeast GA and trends will continue to be monitored closely.

   ..Leitman.. 01/21/2017


   LAT...LON   32178231 32638201 33088208 33608223 33828202 33868120
               33868098 33678039 33098001 32518013 31668082 31018145
               30858181 30808229 30888301 31408311 31868273 32178231 

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