MESOSCALE DISCUSSION 1215
   NWS STORM PREDICTION CENTER NORMAN OK
   1243 PM CDT SAT JUN 12 2004
   
   AREAS AFFECTED...SERN NEB...SWRN IA
   
   CONCERNING...TORNADO WATCH 446...
   
   VALID 121743Z - 121915Z
   
   SURFACE ANALYSIS INDICATES A MESO-SCALE LOW HAS DEVELOPED ASSOCIATED
   WITH THE SEVERE THUNDERSTORMS NOW MOVING ACROSS SERN NEB.  THIS IS
   ENHANCING SHEAR AND CONVERGENCE EWD INTO SWRN IA.
   
   EXTREME INSTABILITY IS FEEDING INTO THE DEVELOPING TORNADIC
   SUPERCELLS FROM SAUNDERS SWD TO GAGE COUNTIES. THESE STORMS ARE
   MOVING 260/25-30 AND WILL REACH THE MO RIVER AROUND 18Z VICINITY OF
   OMA AND 19Z NEAR MO/IA BORDER.
   
   TORNADOS HAVE BEEN REPORTED IN THE SAUNDERS COUNTY SUPERCELL AND ARE
   LIKELY WITH THE GAGE COUNTY STORM.
   
   CONDITIONS ARE FAVORABLE FOR A POSSIBLE LARGE...DAMAGING TORNADO AS
   ACTIVITY MOVES INTO SWRN IA.
   
   ..HALES.. 06/12/2004
   
   
   ATTN...WFO...DMX...EAX...OAX...
   
   40939633 41919638 42129561 42079501 41929464 41589455
   41319465 40629505 40219534 40159577 40279666