Ontario: Soggy weather will include a brief late-week surge of mild air

Digital Writers
Ontario: Soggy weather will include a brief late-week surge of mild air

The week ahead will feature a few rounds of unsettled weather in Ontario, beginning with snow in the north Monday and showers in the south starting Monday evening. While they will be short-lived events, easing off through Tuesday, more unsettled weather is expected for mid- and late-week, along with a short-lived injection of mild air in the southern regions by Friday, spiking temperatures into the low or mid teens. However, a blast of colder air will return for the weekend, but plenty of sunshine. Timing, details of what lies ahead this week, below.

WEATHER HIGHLIGHTS

  • System from the U.S. spread showers across southern Ontario Monday evening, into Tuesday
  • Temperatures jump to high single digits for Tuesday
  • Unsettled into the late week, brief shot of milder air before temperatures drop on the weekend

MONDAY EVENING: SHOWERS MOVE IN THE SOUTH, TEMPERATURES CLIMB

After a chilly end to the weekend, temperatures will make a slight recovery by Tuesday, but will be brief. Although daytime highs won't likely hit double digits in most areas, aside from parts of the southwest, temperatures will still sit comfortably in the upper single digits.

ONTuesTemp

Most of the day Monday will be dry, but a clouds will increase during the afternoon as a system will move into the south in the evening, spreading light showers to the lakes Erie and Ontario shorelines, reaching the GTA Monday night.

Areas to the north of Toronto will see a rain/snow mix, while central Ontario will receive just snow. Ottawa may see some mixing Monday overnight, but will change to rain by Tuesday morning.

It won't be a soaker and amounts are expected to be light, remaining in the 2-5 mm range, with totals up to 10 mm in eastern Ontario. Showers will taper off in the GTA Tuesday morning and will linger into the early afternoon in eastern areas.

ONrain

Another messy system will move into southern Ontario Wednesday night with a period of light snow and freezing rain, primarily north of Highway 401 before changing to rain and ending Thursday morning. Only minor precipitation totals are expected, but icy surfaces are possible, especially northwest of Toronto.

NORTHERN ONTARIO SNOW

In the northern areas of the province, a cold front has tracked in from the Prairies and will continue to spread snow Monday. While most places will see relatively light accumulations -- in 5-10 cm range -- some areas along Lake Superior could get 15-20 cm through Tuesday.

Southerly winds over Lake Superior will help enhance snowfall totals. Another system from south of the border is expected for the latter half of the week, with more snow and possibly freezing rain and rain, as well.

LATE WEEK: BRIEF SURGE OF MILD AIR, UNSETTLED WEATHER BUT CHILLY BY THE WEEKEND

Once this low exists, more unsettled weather is expected for southern Ontario from Thursday night through Friday night, thanks to abundant moisture and a pair of systems tracking along a boundary between very mild air to the south and cold air to the north.

ONFriTemp

"This will bring primarily rain to the region and very mild temperatures that could reach the low to mid teens across parts of southern Ontario, and double digits could reach southern-most parts of Quebec," says Weather Network meteorologist Dr. Doug Gillham says.

However, the warm temperatures will be short-lived as an Arctic high pressure tracks into the region for the weekend, allowing for lots of sunshine but well below seasonal temperatures.

Check back through the week as we continue to monitor the forecast.