Those of you waiting for the arrival of winter may not have to wait too much longer if today's runs of weather models are close to being correct. Both the European model and the GFS model show a cold pattern taking control beginning around the middle of next week. All of this hinges on the developing block and a storm that is forecast to form off the East Coast this weekend.
The developing low in the Canadian Maritimes is key here. As that system strengthens it weakens the ridge that attempts to build in the East. In fact models have backed off on the strength of that ridge in response to the stronger storm to the east. We also have a trough in the Rockies which is swinging east as well. The European is a bit different in how it handles the puzzle pieces with a slightly stronger ocean storm in the Maritimes. It also handles the west a bit differently as it separates the southern end of that Rockies trough and drops it southwestward.
Carrying it further to the middle of next week both models get to a rather dynamic colder pattern in the Eastern US...READ MORE AT http://www.meteorologistjoecioffi.com/index.php/2017/11/27/weather-models-growing-bullish-colder-long-range/