After a slight warming trend over the upcoming weekend with temperatures into the 40s, another shot of arctic air is set to push back into the Twin Tiers by Tuesday.  A cold front will approach on Monday with increasing clouds and the chance for a few rain showers.  The rain will mix with and change over to snow by Monday night as the front passes through.  Highs on Tuesday will only be in the lower 30s with upper 20s expected on Wednesday.