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Ontario: First snow, widespread frost threat as temperatures plummet

Thursday, October 3rd 2019, 9:23 am - Tumbling temperatures mean frost and even a snow threat for southern Ontario this week.

After a gloomy -- and much cooler -- Wednesday across much of southern Ontario, the region is staring down one more day of showers before sunnier skies round out the week. The same can't be said for the heat, however as a widespread frost will kick off the weekend across the province. We look at how far temperatures will tumble, and how that's also bringing some early wet snow to some regions, 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:

  • Scattered showers move through Thursday for south, risk of wet snow in the north
  • Strong cold front drives temperatures down second half of week
  • Widespread frost threat through Friday
  • Stay aware of ALERTS in your area

FALL PATTERN LOCKS IN, WIDESPREAD FROST AS TEMPERATURES TUMBLE

Another fast-moving system will skirt through southern and central Ontario on Thursday as daytime highs struggle to even reach the lower teens for most areas. While it isn't a powerful weather-maker, it may still have an unwanted impact for some. Widespread, scattered showers are in store for much of southern and eastern Ontario, while parts of northern Ontario picked up the first helpings of wet snow early Thursday.

"Radar showed us snowfall being picked up in parts northernwestern and northeastern Ontario through the overnight hours on Wednesday and into early Thursday," says Weather Network meteorologist Kelly Sonnenburg. "Dryden, Pickle Lake and surrounding areas were reporting light snow."

WATCH BELOW: TRACKING THURSDAY'S SYSTEM

Northern parts of cottage country are most at risk to see a mix of rain and wet snow through Thursday evening as well with some light accumulations also expected north of Lake Superior and the Nickel Belt.

ON Snow

Even for those who don't see the flakes flying, there will be a widespread chill in the air by early Friday.

While high pressure will clear out the clouds through the start of the weekend, sunshine won't do much to help high temperatures with many places barely hitting the lower teens through Friday.

onfeelsfri (1)

"Widespread frost is likely Friday night and early Saturday outside of urban/suburban areas," says Weather Network meteorologist Dr. Doug Gillham. "Temperatures will dip well below freezing across parts of cottage country."

The rain showers return late Saturday night ahead of a brief boost in daytime highs with some places returning to the 20 degree mark by Sunday.

AUTUMNAL WEATHER SETTING UP FOR THANKSGIVING

Mostly sunny and pleasant conditions look to dominate much of next week before another cool down heading into the long weekend.

"However, at this point it looks like a cold front will cross our region during Friday with rather autumnal weather expected for the Thanksgiving long weekend," Gillham says.

WATCH BELOW: HOW ONTARIO HEAT PLAYED INTO A STAGGERING TEMPERATURE SPREAD

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