THROUGH NOON SUNDAY—A low pressure trough will lie across the Interior of Alaska from the Seward Peninsula eastward. A series of weather fronts will move into Alaska from the southwest causing considerable cloudiness with scattered light snow along western and southern sections.ARCTIC SLOPE—Increasing cloudiness from the south tonight and Sunday. Northeast winds to 20 mph along the westernn coastal sections, gradually increasing Sunday. Lows tonight are 15 to 25 below. Highs Sunday are 5 to 15 below. Outlook for Monday is considerable cloudiness. TAN ANA VALLEY—Considerable cloudiness tonight through Sunday. Few areas of light snow spreading eastward tonight and Sunday. Lows tonight are zero to 30 below. Outlook for Monday is a few flurries.