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Mesoscale Discussion 97
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   MESOSCALE DISCUSSION 0097
   NWS STORM PREDICTION CENTER NORMAN OK
   1009 AM CST WED JAN 30 2013
   
   AREAS AFFECTED...NRN/WRN GA...ERN/SRN AL...AND ADJACENT AREAS OF THE
   FL PNHDL
   
   CONCERNING...TORNADO WATCH 18...19...
   
   VALID 301609Z - 301745Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 18...19...CONTINUES.
   
   SUMMARY...POTENTIAL FOR STORMS CAPABLE OF PRODUCING DAMAGING WIND
   GUSTS AND TORNADOES PROBABLY WILL INCREASE THRU
   18-20Z...PARTICULARLY ACROSS PARTS OF EASTERN ALABAMA THROUGH
   WESTERN/NORTHERN GEORGIA.
   
   DISCUSSION...A PRE-FRONTAL SQUALL LINE HAS SHOWN ONLY FAIRLY SLOW
   EASTWARD MOVEMENT DURING THE PAST SEVERAL HOURS.  MEANWHILE..BROAD
   LARGE-SCALE ASCENT ASSOCIATED WITH LOW-LEVEL WARM ADVECTION IS 
   CONTRIBUTING TO NUMEROUS SHOWERS WITHIN THE RELATIVELY NARROW WEDGE
   OF HIGHER BOUNDARY LAYER MOISTURE WHICH HAS ADVECTED INLAND OFF THE
   GULF OF MEXICO.  CLOUD COVER WITHIN THIS AIR MASS IS LIMITING
   SURFACE HEATING AND BOUNDARY LAYER DESTABILIZATION.  HOWEVER...THE
   RAPID REFRESH SUGGESTS THAT A 65-70 KT SOUTHERLY 850 MB JET CORE IS
   IN THE PROCESS OF EXPANDING NORTHEASTWARD OUT OF SOUTHWESTERN
   ALABAMA INTO THE NORTHERN GEORGIA PIEDMONT BETWEEN NOW AND 18-20Z. 
   THIS IS EXPECTED TO OCCUR AS THE AMPLIFIED UPSTREAM UPPER TROUGH
   AXIS TAKES ON MORE OF A NEUTRAL TO NEGATIVE TILT ACROSS EASTERN
   TEXAS INTO THE LOWER MISSISSIPPI VALLEY.  GIVEN THE PRESENCE OF
   STRONG VERTICAL SHEAR...AT LEAST WEAK INSTABILITY...AND INCREASING
   LARGE-SCALE SUPPORT FOR UPWARD VERTICAL MOTION...POTENTIAL FOR
   INCREASING CONVECTIVE ORGANIZATION/EASTWARD ACCELERATION AND SEVERE
   WEATHER POTENTIAL APPEARS TO EXIST EARLY THIS AFTERNOON ALONG A
   CORRIDOR FROM MONTGOMERY AND TROY AL THROUGH AREAS NEAR AND
   NORTHEAST OF THE ATLANTA METROPOLITAN AREA.  THIS INCLUDES THE RISK
   FOR TORNADOES...AS WELL AS DAMAGING WIND GUSTS.
   
   ..KERR.. 01/30/2013
   
   ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
   
   ATTN...WFO...FFC...TAE...BMX...MOB...
   
   LAT...LON   32028674 32718633 33728551 34388488 34378388 33928372
               32718467 31608557 31518651 32028674 
   
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