999 
FXUS63 KUNR 290230
AFDRAP

AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY SD
730 PM MST MON DEC 28 1998

ARCTIC AIR SPREADING ACROSS WESTERN SOUTH DAKOTA THIS EVENING. 
STRONGEST PRESSURE RISES MOVING TO THE EAST COMBINED WITH FRONTAL 
INVERSION...WINDS HAVE DROPPED BELOW ADVISORY CRITERIA. WILL ALLOW 
ADVISORY TO EXPIRE. AREAS OF LIGHT SNOW CONTINUE TO MOVE ACROSS THE 
AREA AND SHOULD CONTINUE THROUGH MOST OF THE NIGHT DUE TO LOW LEVEL 
FRONTOGENSIS. KGGW/KBIS SOUNDINGS INDICATE THAT THE COLD AIR IS DEEP 
ENOUGH TO MOVE INTO NORTHEAST WYOMING AND ALSO AFFECT THE HIGHER 
ELEVATIONS OF THE BLACK HILLS. FORECAST SOUNDINGS ALSO SUPPORT FOG 
TONIGHT ESPECIALLY ALONG EASTERN/NORTHERN SLOPES OF THE BLACK HILLS.

.UNR...NONE.
KRC