165 
FXUS73 KBIS 210833
SFDBIS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BISMARCK ND
330 AM CDT SAT AUG 21 1999

FORECAST IS MUDDLED BY WEAK FEATURES BUT STRONG INSTABILITY...SO 
MAIN FORECAST CHALLANGE WILL BE TIMING THE THUNDERSTORMS. WEAK 
SURFACE TROUGH WILL LINGER AROUND THE STATE THROUGH THE FORECAST 
PERIOD UNTIL A STRONGER TROUGH WITH ASSOCIATED COLD FRONT PUSHES 
INTO THE REGION SUNDAY. WEAK SHORTWAVE/VORT LOBE FCST INTO WEST 
TONIGHT FOLLOWED BY STRONGER SYSTEM SUNDAY. WILL TREND TOWARD 
TYPICAL DIURNAL TRENDS IN THE THUNDERSTORMS AND GO WITH A DRY DAY 
TODAY...KEEP SLGHT CHC TSRA IN TONIGHT WITH BETTER CHANCE SUNDAY IN 
STRONGER TROF/DYNAMICS. TEMPS LOWER 90S WEST...MID 80S EAST CENTRAL 
STILL LOOK REASONABLE. SPEED OF SFC TROUGH WILL DETERMINE IF TEMPS 
ARE COOLER SUNDAY IN THE WEST. ENHANCED MIXING MAY EEK OUT A FEW 
MORE DEGREES THAN MOS HAS IN THE WEST. 

.BIS...NONE
ABELING