A cold front. I think that this warm weather will play out the way it will and that will result in some sketchy ice for southern NH in the week to come. After that, I think we are due for a freeze up and a very good one. Something similar happened in winter of 2013-2014 when the warm weather was followed up by a snow storm then some cold weather. The forecast calls for some chilly weather towards the end of the week, let's hope that doesn't change.