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Active storm track will bring rain, temperature swings to Ontario

Sunday, October 18th 2020, 8:03 pm - The coming week will be quite unsettled across southern Ontario, with rounds of rain from multiple systems, accompanied by back-and-forth temperature swings.

Ontario will see several days of rainy weather due to a jet stream sitting over the region, which creates an ideal environment for systems to develop and track through. Temperatures will also go back-and-forth, with seasonal and above seasonal daytime highs scattered throughout. The first 'pulse' of rain will move in Monday night, while some northern regions of the province prepare for snowfall. Details and timing, below.


WEATHER HIGHLIGHTS

  • Most of Monday will be dry in southern Ontario, clearing out early afternoon for eastern Ontario
  • First of multiple systems comes in Monday evening, 5-15 mm of rain possible
  • Active pattern continues through the week with changeable temperatures

MONDAY NIGHT: FIRST 'PULSE' OF RAIN TO MOVE IN

Rain will ease off in the GTA during the pre-dawn hours Monday, but will continue until the early afternoon for eastern Ontario. The rest of the day will be dry, but a weak low will move into southern Ontario in the evening hours with scattered rain. This system is expected to bring a widespread 5-15 mm of rain across the region.

onrain

Temperatures will be mostly seasonal this week except for some warmer periods with each system that tracks through. Monday's daytime highs will struggle to hit the double digits in some parts of the south.

TUESDAY AND BEYOND: ACTIVE STORM TRACK FUNNELS IN MULTIPLE SYSTEMS, CHANGEABLE TEMPERATURES

Rain from the first system will depart eastern Ontario by Tuesday morning and will leave most of the region dry during the day. The break in the rain will be short-lived, with another system expected to trek through in the overnight hours into Wednesday morning.

Rainfall amounts with this system will be slightly higher than Monday's, with general totals of 10-20 mm in southern Ontario.

The system will draw down colder air to northern regions, which will cause the precipitation to fall as snow for areas north of the Nickel Belt. There is a slight chance of flurries for the Algonquin Highlands, but no accumulations are expected.

ONTempWed

The good news is temperatures will be mild on Wednesday, with daytime highs hitting the upper-teens in much of the south. Eastern areas and cottage country will be slightly cooler.

Winds will also be strong, with gusts hitting 40-60 km/h across the region.

This won't be the end of the rain, as the unsettled pattern will continue with another low-pressure system pushing in Thursday night.

Stay tuned to The Weather Network for the latest forecast details.

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