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Editor's Choice Canada's 2020 Fall Forecast & Winter Preview Latest

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Health Ontario: Widespread soaking rain and thunderstorms majorly slow commute times Wednesday, October 16th 2019, 8:00 pm - Expect Wednesday commute times in southern Ontario to be impacted by heavy rains Late-season thunderstorms jolted Ontarians out of bed Wednesday, and though those downpours have tapered off, they'll linger into Thursday for parts of the east, as will lake effect showers in the southwest. More on this system's lingering effects, the impact of a U.S. nor'easter, and a look at an extended period of cooler weather that threatens pre-Halloween snow, below. Visit our Complete Guide to Fall 2019 for an in-depth look at the Fall Forecast, tips to plan for it and a sneak peek at the winter ahead WEATHER HIGHLIGHTS: Rain continues in eastern Ontario Thursday, from the departing system and indirectly from a nor'easter in the U.S.

Lake-effect showers possible Thursday for the southwest.

Temperatures will remain cool, as gradually-clearing skies round out work week

Potential for late month pre-Halloween snow

Stay on top of the ALERTS in your area WATCH BELOW: WHERE TO EXPECT LINGERING SHOWERS THURSDAY After being awoken by downpours and the crackle of thunder in the southwest and GTA Wednesday, by Thursday morning it will be eastern Ontario that wakes to the showers, having begun overnight. Those rains will be the last effects of the system that produced them, which at that point will be largely over southern Quebec. To the southwest, cool air blowing over the relatively warmer Lake Huron and Georgian Bay will trigger some lake-effect showers, though not too heavy compared to Wednesday morning's deluge. Back in eastern Ontario, though this system will taper through the morning, more moisture will roll in through the course of the day. This will be due to the indirect effects of another low-pressure nor'easter system tracking gradually up the northeastern U.S., which will eventually have some impact on Atlantic Canada:

More widespread gusty conditions will also persist across southern Ontario through the day Thursday, with daytime highs barely even reaching double-digit values.

Those chilly conditions will continue for Friday with some of the coolest air we've seen yet this fall through the Lower Great Lakes. The week, however, looks to end on a much sunnier note.

BRIEF SHOT OF WARMER WEATHER FOR THE WEEKEND, RISK OF SNOW AHEAD OF HALLOWEEN

After a mostly chilly and below-seasonal week, a short spell of warmer temperatures is expected into the weekend, despite frosty conditions to start out Saturday.

"Temperatures will recover to the mid-teens on Saturday afternoon, staying in the upper teens with sunshine on Sunday," says Gillham.

By Monday, some areas across the south may even reach the 20-degree mark ahead of a more extended period of colder than normal weather to round out the month.

"After a few days of warmer weather, the final week of October --and into early November -- will bring an extended period of colder than normal temperatures to the Great Lakes region," Gillham says. "This pattern would bring the potential for significant lake effect snow in the snow belt areas before Halloween."

WATCH BELOW: FIND OUT WHICH CANADIAN CITY COMES OUT ON TOP FOR MOST SNOW IN 2019