Yesterday’s activity was caused by a strong low pressure system with a trailing cold front passing through the area. With that system now well off to the east, we’re keeping an eye on a secondary cold front that is working through today. This one is much weaker. The stage is set for cooler air to filter in today, with some moisture in the upper atmosphere. The air should be cool enough flowing over a relatively warm Lake Ontario (temperatures still in the 70s) to create some lake effect rain showers. Additionally, should the high temperature fail to hit 70, it would mark the first time that has happened in three months!!
However, the cooler air at the end of the weekend and early next week is just a taste of fall. The center of the cooler air mass is an area of high pressure that will settle over us Tuesday then slowly shift to our east come midweek. This air mass will modify and warm due to plenty of sunshine then clockwise winds on the backside of the high will warm us further. We could be back close to 80 by that time.