Ontario: Tropical moisture will bring rain and muggy conditions

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The moisture from Tropical Storm Cristobal will track towards Ontario and will fuel a moisture-laden low pressure system that will bring rain and instability late Tuesday through Wednesday. The instability means that thunderstorms are possible as well as intense wind gusts that could cause damage. Humidity levels will climb as the moisture tracks in and some cities in southern Ontario, particularly Ottawa, could feel like the upper 30s by Wednesday. Details and timing, below.


The remnants of Tropical Storm Cristobal will track into Ontario late Tuesday into Wednesday. This is the second round of remnants from a tropical storm that will track into the province in a two week period – the previous round was from Bertha.

Rain will track across southern Ontario on Wednesday and The Weather Network meteorologist Tyler Hamilton describes the low pressure system as being “unusually deep” for this time of year. This means that there is the potential for thunderstorms and powerful wind gusts that could be damaging.

Northern Ontario will also see particularly high rainfall accumulations, with 30-50 mm being widespread and some localized regions seeing up to 75 mm.

Temperatures will climb above seasonal in southern Ontario and by Wednesday many regions will be near 30°C. Moisture from Cristobal will create high humidity and some cities could feel like the mid to upper 30s.


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