Arctic air brings chill to Ontario as next shot of snow looms for some

Digital Writers
·3 min read
Arctic air brings chill to Ontario as next shot of snow looms for some
Arctic air brings chill to Ontario as next shot of snow looms for some

With January coming to an end, temperatures more reflective of the season have made an appearance in southern Ontario after what was a mild start to winter. Daytime highs Saturday will be into the minus single digits, accompanied by wind chills making them feel closer to or reaching the minus double digits for parts of the region. Snow squalls have finally eased and a ridge of high pressure has moved in their wake. However, snow is expected to return to southwest Sunday as a Colorado low skirts south of the Great lakes, but will be close enough to bring some wintry impacts to the region. Gusty easterly winds may also generate some lake-enhanced snow for the west end of Lake Ontario, but nothing impactful is expected. More on the timing and impact of this system, below.

WEATHER HIGHLIGHTS:

  • Lake-effect snow ends, frigid temperatures Saturday

  • Daytime highs of just -4°C to -6° throughout the GTA Saturday

  • Colorado low tracks south of the Great lakes, grazes the southwest with snow Sunday

SATURDAY: SNOW SQUALLS DIMINISH, BITTERLY COLD TEMPERATURES LOCK IN

Officially the coldest of weather of the season so far has returned to southern Ontario, in what has been a well-above seasonal winter to date.

Snow squalls across southern Ontario have eased, allowing for a sprawling ridge of high pressure to move in for Saturday. This will make for relatively light winds and clear skies for the GTA and eastern Ontario during the day.

Daytime highs will hover between -4°C and -6° across the GTA, with wind chills approaching or into the minus double digits.

ONTempsSat(SatAM)
ONTempsSat(SatAM)

Parts of southwestern Ontario will see increasing cloud cover from an approaching Colorado low Saturday evening.

SUNDAY: COLORADO LOW WILL SKIM THE SOUTH

With cold temperatures blanketed across Ontario through the weekend, eyes have turned to a Colorado low that is expected to track well south of the border. Major impacts from the system will remain stateside because its position -- affecting the U.S. Midwest and northeast with a wintry mix and heavy snowfall.

As for southern Ontario, it will be grazing parts of the extreme southwest, and likely just the northern shores of Lake Erie, with flurries beginning Saturday overnight or by the pre-dawn hours Sunday morning.

ONSundayLowSnow (Sat AM)
ONSundayLowSnow (Sat AM)

Due to the southern track of this system, light snowfall will likely come in a few waves as parts of southern Ontario will only see the northern fringe of the low.

In terms of snowfall accumulations, the low will bring anywhere from 3-5 cm for other areas along Lake Erie to upwards to 10 cm for the extreme southwest.

Easterly winds are expected to strengthen over Lake Ontario Sunday, with gusts of 40-60 km/h, possibly allowing for lake enhancement snow for the west end of Lake Ontario. Winds will ease in the overnight hours Sunday.

Beyond the weekend, snow may likely return to these southwestern regions on Monday. As well, Arctic air eases for southern Ontario by Tuesday as temperatures rebound closer to seasonal or even slightly above.

ONTempWed
ONTempWed

Be sure to check back as we continue to update the forecast in Ontario.