Ontario: Shifting squalls ahead of widespread snow risk Monday

Digital Writers
Ontario: Shifting squalls ahead of widespread snow risk Monday

Dangerous snow squalls will continue across parts of southern Ontario through Saturday with as much as 40 cm possible under the most intense bands by the time all is said and done. Some scattered flurries will persist into the weekend, but attention then turns to a potential system that could bring a more widespread snow later on Monday. More on where the travel remains the worst through the start of the weekend, plus a look at the arctic air and significant system that could snarl the start of the new workweek, below.

Time to prepare for the season ahead! The Weather Network's Winter Forecast launches Monday, November 18.

WEATHER HIGHLIGHTS:

  • Squalls redevelop across the Bruce Peninsula and western shores of Georgian Bay overnight into Saturday morning, persist through day
  • Scattered snow showers, weak snow bands near Lakes Erie and Ontario early Saturday
  • Watching the potential development of a system along a boundary over the Great Lakes Monday
  • Stay up-to-date on the ALERTS in your area

WATCH: TRACKING SHIFTING SQUALLS THROUGH SATURDAY

SQUALLS ON THE MOVE, NEW AREAS IMPACTED

Snow squalls blasted parts of southern Ontario on Friday, with 27 cm reported in London through the morning. While winds have shifted, lake-effect streamers will be with us again on Saturday. Winds out of the southwest will put the focus for the strongest bands east of Lake Huron and Georgian Bay, through Muskoka and North Bay.

Lake Erie and Ontario may also produce a few bands, mainly through Saturday morning, when the Niagara region and Hamilton are likely to see some snow. As winds continue to shift Saturday afternoon, these bands may also drift through the GTA and along the 401 corridor north of Lake Ontario.

SEE ALSO: How the Great Lakes contribute to dangerous wintry weather

POTENTIAL FOR WIDESPREAD SNOW, INCLUDING THE GTA, MONDAY

Forecasters are also closely watching the increasing potential for a significant system set to develop and track along the cold front south of the U.S. border early next week.

"The northern edge of this system is expected to extend into southern Ontario and southern Quebec and bring widespread snow later Monday through Monday night," says meteorologist Dr. Doug Gillham, adding that there is still considerable uncertainty regarding the exact track of the system and snow totals.

"But we have the potential for snow totals to reach 5-10 cm along the 401 corridor, including the Greater Toronto Area. If this system shifts further to the south, then snow totals will be much lower," Gillham adds.

Be sure to check back through the weekend for your latest forecast updates.

MUST READ: Typhoon Halong hampers any dream of a notable November warm-up

BRIEF SURGE OF MILDER AIR SUNDAY BEFORE CHILL RETURNS

After some of the coldest air of the season so far, temperatures will get a slight bump by Sunday, though with scattered rain showers possible during the day.

That warm-up will be extremely short-lived however; more Arctic air takes aim at the Great Lakes by early next week. Temperatures through Wednesday will be much more typical of mid-December than early November, so be sure to bundle up.

Once again, intense lake-effect snow squalls will severely impact travel southeast of Georgian Bay and Lake Huron, including areas near London and Collingwood.

Although the cold pattern looks to relax at times during late November, overall, the chilly weather is set to dominate right through the end of the month.

SCIENCE BEHIND THE LAKE-EFFECT SNOW MACHINE