The Campbell County School division has used up its supply of extra days built into the school calendar. Forecasters warn of another, and possible the most significant winter storm of the season, on the way for tomorrow—School administrators say even delays, cut into the total number of hours the division has banked. The School Superintendent told board members on Monday, that if the division continues to rack up snow days, it will qualify for a weather exemption for its school calendar, and won’t have to get any special waver from the general assembly to start school before Labor Day.