SPC MESOSCALE DISCUSSION 0423 FOR NORTHERN AND CENTRAL OKLAHOMA
CONCERNING...TORNADO WATCH 99...

VALID 070148Z - 070400Z

LINE OF STRONG TO SEVERE THUNDERSTORMS WILL CONTINUE TO MOVE
RAPIDLY EASTWARD THROUGH THE CENTRAL PARTS OF THE STATE.  

SURFACE OBSERVATIONS CONTINUE TO SHOW A WARM AND MOIST ENVIRONMENT
AHEAD OF THE LINE...BUT THE EVENING SOUNDING FROM NORMAN SHOWED A
SUBSTANTIAL CAPPING INVERSION.  THE SOUTHERN PART OF THE LINE HAS
BEEN ATTEMPTING TO DEVELOP OVER THE PAST COUPLE OF HOURS...BUT THE
INVERSION HAS SO FAR PROVED TO BE STRONG ENOUGH TO LIMIT
CONVECTION.  HOWEVER...THERE COULD BE SUFFICIENT FORCING TO
MAINTAIN CONVECTIVE DEVELOPMENT THROUGH THE NIGHT.

FARTHER NORTH...THE LINE HAS BROKEN INTO SEVERAL SHORT BOWS OVER
THE NORTHERN COUNTIES OF THE STATE.  EARLIER REPORTS INDICATE
SIGNIFICANT WIND DAMAGE IN WEST CENTRAL AND NORTHWESTERN OKLAHOMA. 
AS THE LINE CONTINUES TO EVOLVE INTO BOW ECHOES...THE POTENTIAL FOR
BOW HEAD TORNADOES MAY INCREASE AS WELL AS WIDESPREAD WIND DAMAGE.

..REHBEIN.. 04/07/01