750 
FXUS63 KFSD 250240
AFDFSD

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA 
NATIONAL WEATHER SERVICE SIOUX FALLS SD  
840 PM CST FRI DEC 24 1999

MAIN PROBLEM THIS EVENING IS THE WARM FRONT DOES NOT APPEAR TO BE 
MOVING AS FAST EAST AS PROGS WOULD SUGGEST. THIS HAS CREATED A LOW 
DEWPOINT SPREAD AND LIGHT WIND SCENARIO OVER CENTRAL PART OF 
FORECAST AREA WHERE CLOUDS CLEARED AROUND SUNSET. THIS HAS ALREADY 
ALLOWED LIGHT FOG TO REDEVELOP IN THE SIOUX FALLS AREA. ATTM EXPECT 
FRONT MAY BE WAITING FOR WEAK SHORT WAVE LATER TONIGHT. HAVE UPDATED 
A FEW ZONES TO REFLECT THIS. ALSO UPDATED TO MAKE MINOR ADJUSTMENTS 
TO THE TEMPERATURES IN THE EXTREME EASTERN PART OF FORECAST AREA FOR 
TONIGHT. 

SATELLITE LOOPS AND SURFACE ANALYSIS EARLY THIS EVENING INDICATE 
TRAILING EDGE OF LOW CLOUDS CONTINUING TO MOVE EAST...AND SHOULD 
EXIT FORECAST AREA BEFORE MIDNIGHT. PREVIOUS FORECAST HAS THIS 
COVERED WELL. WITH THESE CLOUDS CLEARING AND WINDS DECREASING...SAME 
SCENARIO MAY DEVELOP OVER EASTERN PART OF FORECAST AREA AS HAS 
DEVELOPED OVER CENTRAL PART OF FORECAST AREA. FURTHER UPDATES MAY BE 
NECESSARY.  
 
.FSD...NONE

BLOOM