(Portland, OR) -- If you're planning to leave early for Spring Break you might have to deal with snow in the mountains. A winter storm starting Thursday night could bring up to 12-inches of snow down to 15-hundred feet. Above 25-hundred feet 12 to 24 inches of snow could fall. Drivers should be prepared for winter conditions in the Coast Range and the Cascades. The Valley Floor could even see a wintery mix.