MESOSCALE DISCUSSION 0175
   NWS STORM PREDICTION CENTER NORMAN OK
   0241 AM CST WED FEB 06 2008
   
   AREAS AFFECTED...PORTIONS SRN/ERN MS...WRN/CENTRAL/NRN AL...MIDDLE-ERN TN
   
   CONCERNING...TORNADO WATCH 41...43...
   
   VALID 060841Z - 061045Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 41...43...CONTINUES.
   
   ADDITIONAL WW ISSUANCES ARE PROBABLE BEFORE THESE WOULD EXPIRE AT
   11Z. TORNADO THREAT PERSISTS ACROSS WW AREAS AND SHOULD FOR AT LEAST
   ANOTHER 2-3 HOURS...WITH GREATEST POTENTIAL FOR LONG-LIVED/DAMAGING
   TORNADOES ACCOMPANYING DISCRETE SUPERCELLS DEVELOPING AHEAD OF
   PRIMARY CONVECTIVE BAND.  SHORTER-LIVED/WEAKER TORNADOES ALSO ARE
   POSSIBLE WITH PRIMARY TSTM LINE...FROM WHICH DAMAGING GUSTS WILL BE
   PRIMARY THREAT.
   
   AREA E OF THESE WWS ACROSS ERN TN AND MOST OF NWRN GA MAY REMAIN
   CONSIDERABLY MORE STABLE AND LESS FAVORABLE FOR SUPERCELL TORNADOES
   THAN FARTHER W...BUT WITH DAMAGING WIND POSSIBLY ACCOMPANYING MAIN
   TSTM BAND.  AIR MASS RECOVERY ACROSS PORTIONS NERN/CENTRAL/SRN AL
   MAY COMPEL ADDITIONAL/REPLACEMENT TORNADO WW ISSUANCE FOR THOSE
   AREAS BEFORE PRESENT WW 41 EXPIRES.
   
   MODIFIED RAOBS AND RUC SOUNDINGS INDICATE EFFECTIVE INFLOW PARCELS
   REMAIN ROOTED NEAR GROUND FOR SFC THETAE VALUES CORRESPONDING TO
   TEMPS AROUND 65 F AND DEW POINTS AOA ABOUT 63 F.  SFC MESOANALYSIS
   SHOWS THIS AIR MASS ALREADY COVERING LARGE PART OF AL...NARROWING
   NWD OVER MID TN FROM CSV AREA WWD TO MAIN CONVECTIVE BAND.  THIS
   SUPPORTS MLCAPES RANGING FROM LESS THAN 200 J/KG OVER MID TN TO
   5000-800 J/KG RANGE OVER SERN MS AND SWRN AL.  KINEMATIC PROFILES
   WILL REMAIN VERY STRONG...WITH ELONGATED HODOGRAPHS YIELDING 0-1 KM
   SRH EXCEEDING 300 J/KG IN MANY AREAS...AND EFFECTIVE SHEAR 50-60 KT.
   
   ..EDWARDS.. 02/06/2008
   
   
   ATTN...WFO...MRX...JKL...FFC...LMK...OHX...BMX...HUN...MOB...MEG...JAN...LIX...
   
   31349071 33578891 35168753 36688639 36588356 34998438
   32798680 31968857