MESOSCALE DISCUSSION 2153
   NWS STORM PREDICTION CENTER NORMAN OK
   1026 AM CDT MON AUG 25 2008
   
   AREAS AFFECTED...AL/FL PANHANDLE/WRN GA
   
   CONCERNING...TORNADO WATCH 863...
   
   VALID 251526Z - 251630Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 863 CONTINUES.
   
   COUNTIES WITHIN THE TLH...FFC...AND BHM /ALONG THE ERN AND NRN
   PERIPHERIES OF WW 863/ MAY BE LOCALLY ADDED TO THIS WW AS THE
   THREATS FOR DAMAGING WINDS AND ISOLATED TORNADOES ADVANCES SLOWLY TO
   THE E AND NNE.
   
   TRENDS WILL CONTINUE TO BE MONITORED FARTHER N ACROSS FAR NRN AL/
   NWRN GA FOR AN INCREASED SEVERE WEATHER THREAT.  IF A NEW WATCH
   BECOMES WARRANTED FARTHER N...THEN WW 863 WILL LIKELY BE REPLACED
   WITH A NEW WW.  
   
   REGIONAL RADARS INDICATED THE MOST PERSISTENT LOW LEVEL ROTATIONAL
   COUPLETS IN THE NERN QUADRANT OF FAY /OVER NERN PART OF WW 863/
   WHERE LOW LEVEL WINDS ARE MORE BACKED ENHANCING LOW LEVEL SHEAR.
   CORRIDOR OF RICH LOW LEVEL MOISTURE EXTENDING NWD ALONG ERN
   PERIPHERY OF T.D. FAY /CENTERED OVER EAST CENTRAL MS AT 15Z/ WILL
   CONTINUE TO MAINTAIN MARGINAL INSTABILITY DESPITE EXISTENCE OF
   CLOUDS AND WEAK LAPSE RATES.  AREA VWP DATA SHOWED A 40 KT SLY LLJ
   EXTENDING NWD THROUGH AL...WITH LOW LEVEL SHEAR /EFFECTIVE SRH
   100-300 M2/S2/ ENHANCED IN THE VICINITY OF THIS JET.  SHORT TERM
   MODELS SUGGEST THAT FAY WILL TEND TO MOVE N THEN NNEWD TODAY...WITH
   ATTENDANT LLJ TRANSLATING NWD ACROSS AL INTO NERN AL THIS AFTERNOON.
   THIS WOULD SUGGEST THAT LOW LEVEL SHEAR SHOULD IN TURN INCREASE AND
   MAY SUPPORT A SEVERE WEATHER THREAT SHIFTING E AND NNE OF WW 863.
   
   ..PETERS.. 08/25/2008
   
   
   ATTN...WFO...FFC...TAE...BMX...HUN...MOB...
   
   30238738 31718764 32558786 33388824 34308812 34878800
   34918681 34978538 34908448 33098390 31648376 30688375
   29698412 29278519 29608690