MESOSCALE DISCUSSION 0609
   NWS STORM PREDICTION CENTER NORMAN OK
   0813 PM CDT WED APR 09 2008
   
   AREAS AFFECTED...CNTRL TX INTO S-CNTRL OK
   
   CONCERNING...TORNADO WATCH 179...
   
   VALID 100113Z - 100215Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 179 CONTINUES.
   
   THROUGH 0230Z...THE GREATEST THREAT OF LARGE HAIL AND ISOLATED
   TORNADOES WILL EXIST ACROSS PORTIONS OF WISE...DENTON...COOKE AND
   GRAYSON COUNTIES IN N-CNTRL TX.
   
   AS OF 0110Z...A LONG-LIVED SUPERCELL WITH A HISTORY OF TORNADOES WAS
   PRESENT OVER ERN WISE AND NWRN DENTON COUNTIES IN N-CNTRL TX MOVING
   235/30 KT.  THIS STORM /NOW MUCH MORE HP IN CHARACTER/ APPEARS TO BE
   MOVING OFF A MORE NNW-SSW ORIENTED WARM OR QUASI-STATIONARY BOUNDARY
   INTO A VERY MOIST BOUNDARY LAYER WITH DEWPOINTS IN THE MID/UPPER
   60S.  INDEED...00Z FWD SOUNDING INDICATED A DEEP...MOIST PROFILE
   THROUGH 750 MB...BENEATH MODESTLY STEEP LAPSE RATES WITH MLCAPES OF
   AROUND 2000 J/KG.  
   
   WHILE THIS STORM IS MOVING OFF THE BOUNDARY...CURRENT FTW VWP
   INDICATES THAT LOW-LEVEL SHEAR REMAINS RELATIVELY STRONG ACROSS WARM
   SECTOR WITH 0-1 KM SRH OF 200-250 M2/S2.  THIS IN CONJUNCTION WITH
   THE HUMID BOUNDARY LAYER AND 60-70 KT OF EFFECTIVE BULK SHEAR
   SUGGESTS A CONTINUED THREAT OF TORNADOES AND LARGE HAIL AS SUPERCELL
   CONTINUES ACROSS PORTIONS OF WISE...DENTON...COOKE AND GRAYSON
   COUNTIES.
   
   ..MEAD.. 04/10/2008
   
   
   ATTN...WFO...SHV...TSA...HGX...FWD...OUN...
   
   32239774 34599769 34869714 35159647 35289533 34879522
   34599469 33089513 32829530 32219521 31429514 31189637
   30979721 31289763