|Another fairly warm week ahead for eastern North America, but much colder air is on the horizon. (AccuWeather.com)|
On Wednesday southern Quebec will start to come under the influence of a developing fall storm over the southern US plains. Clouds will slowly increase along with southerly winds. Expect highs to approach 8C (48F) Wednesday, and 12C (54F) Thursday. The normal high/ low should be 5C (41F) and -3C (27F). The strengthening storm system will lift north across the central Great Lakes and into northern Ontario. By Thursday, a cold front will cross southern Quebec with much cooler weather on the way for Montreal by next weekend. Along the cold front, winds will gust in excess of 50km/h and a steady rain will develop.
This storm will be a big weather maker for portions of the US and the eastern Prairies. The coldest air of the season is being pulled south behind the low with heavy snow forecast for many regions. Blizzard conditions may develop from Colorado north into the far western Great Lakes and Manitoba. East of the storm, heavy rain and strong thunderstorms are expected from the Gulf Coast to the Ohio Valley. The coldest air of the season will then settle into eastern Canada by next weekend with high temperatures in Montreal of only 1C (34F) forecast at this time.