SPC MESOSCALE DISCUSSION 0390 FOR ERN OK/NERN TX
   CONCERNING...TORNADO WATCH 101...
   
   VALID 170240Z - 170430Z
   
   VERTICAL SHEAR REMAINS MORE THAN ADEQUATE TO MAINTAIN ONGOING
   CLUSTERS OF SEVERE STORMS AND ISOLATED SUPERCELLS.  STORM EVOLUTION
   OVER THE LAST FEW HOURS IS TOWARD MATURING HP SUPERCELLS WITH SOME
   BOW SHAPED STRUCTURES.  ISOLATED TORNADOES REMAIN
   POSSIBLE...HOWEVER LARGE HAIL AND DAMAGING WINDS MAY BECOME THE
   PRIMARY SEVERE THREAT...ESPECIALLY AS PRECIP SHIELD/COLD POOL
   EXPANDS AND BOUNDARY LAYER COOLS.
   
   
   ..DARROW.. 04/17/02