682 
FXUS63 KFSD 032029
AFDFSD

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA 
NATIONAL WEATHER SERVICE SIOUX FALLS SD 
328 PM CDT THU JUN 3 1999

MAIN PBLM THRU OUT THIS FCST IS TIMING OF TSTMS AND LOCATION OF ANY 
BNDRYS. GREATEST INSTABIL TONITE WL BE OVR WRN CWA...SIMIALR TO LAST 
NITE. TRW ALREADY FIRING UP ALONG DRY LINE FM WRN ND INTO WY. WUD 
EXPECT CONT DEVELOPMENT AS ENERGY ROTATES NEWD OUT OF WRN TROF. THIS 
SHOWS UP FAIRLY WELL ON WATER VAPOR LOOP. QUESTION IS HOW FAR E TRW 
WL PROPOGATE DURG NIGHT. CURRENT AIRMASS OVR ERN CWA RELATIVELY 
STABLE FM RAIN THIS AM. PRECIP MAY HAVE A HARD TIME HOLDING 
TOGETHER...BUT WITH DECENT LLJ AND LLM EXPECTED TONITE...CAN NOT 
RULE IT OUT SO WL KEEP POPS IN FOR LATE TONITE AND CONT FRI MORN. 
ANOTHER WAVE OF ENERGY WL ROTATE OUT OVR THE PLAINS FRI AFTN/NIGHT 
AND WL BRING ANOTHER CHANCE OF TRW. NGM SEEMS TO BE OUT TO LUNCH 
WITH LOWERING DPS INTO THE 40S BY 06Z SAT. PREFER ETA WITH HIGHER DPS
AND BETTER RESOLUTION OF FEATURES. 

IN THE EXTENDED...BEST CHC FOR WIDESPD PRECIP WL BE SAT NITE/SUN MORN 
AS IMPRESSIVE S/W LIFTS NEWD THRU SD. TRW DEVELPMNT MAY BE
QUITE IMPRESSIVE. WL HIT POPS HIGH SAT NITE AND SUN MORN. AFTER 
THAT...AIRMASS WL PBLY BE STABLE ON MON BEHIND S/W BUT RETURN FLOW
OF RH WL BRING ANOTHER CHC OF TRW ON TUES AS SFC BNDRY BISECTS 
SD.

TEMPS WL BE DEPENDENT ON CLD COVER...AND FEEL ENUF SUN WL BE AVAIL TO
REACH GUID TEMPS.

.FSD...NONE.