The weakened polar vortex could lead to a colder weather pattern in parts of the northern U.S. starting Thanksgiving week, with the potential for the chill to persist into early December. However, the impact may be moderated by warmer-than-usual conditions in the Arctic and low snow cover across North America. While colder temperatures are possible, the influence of a strong El Niño could counteract the cooling trend later in December. Residents in affected areas should prepare for a temporary drop in temperatures and potential disruptions to outdoor activities.