Multi-day thunderstorm threat arises with humidity spike in Ontario

·2 min read
Multi-day thunderstorm threat arises with humidity spike in Ontario
Multi-day thunderstorm threat arises with humidity spike in Ontario
Multi-day thunderstorm threat arises with humidity spike in Ontario

Heading into the second full week of July, the setup in southern Ontario is not looking favourable for any vacation plans or trips to the cottage. A familiar stormy pattern is expected to return, with oppressive humidity and abundant atmospheric moisture arriving from the Gulf of Mexico early next week. This will help set up an active storm track, which will allow for numerous systems to push into the Great Lakes region with plenty of rainfall and thunderstorm potential. Torrential rainfall with some of the storms may lead to localized flooding. Take a look at what we know so far, below.

NEXT WEEK: BOUNDARY ALLOWS FOR ACTIVE STORM TRACK, MULTIPLE DAYS OF RAIN

A boundary that will establish and park itself over the Great Lakes early next week will allow for multiple systems to track in through the week. The active storm track will result in several rounds of rain and thunderstorm chances, but no day will be a complete washout.

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"We have a dip in the jet stream, centred over the upper Midwest into the Great Lakes region, and a very strong ridge of high pressure across the East Coast," says Jessie Uppal, a meteorologist at The Weather Network.

ONSetup (July 10)
ONSetup (July 10)

There will be plenty of heat, humidity and atmospheric moisture in play, streaming in from the Gulf of Mexico, setting up the risk for thunderstorms through the week.

"Lots of instability in the atmosphere bubbling up right through next week," Uppal added.

The forecast isn't all doom and gloom, however, as the week will feature periods of sunshine between the storms, but we will have a daily threat for thunderstorms, which will bring torrential rain and a risk for localized flooding. There is also the chance for a few rounds of strong to severe storms across the region. This persistent pattern will last through Friday.

Temperatures, meanwhile, will be into the mid-to-upper 20s throughout the week, with humidex values reaching well into the 30s, approaching 40 at times.

ONHumidity (July 10)
ONHumidity (July 10)

"In contrast to the past few days, next week will feel more like summer as daytime temperatures will be near seasonal for most of the week and overnight lows will be well above seasonal," says Dr. Doug Gillham, a meteorologist at The Weather Network.

It's too early for specific details on rainfall amounts and the thunderstorm threat, so stay tuned to The Weather Network as we get closer to next week

At this point, it looks like next weekend will become less humid and the storm threat will push south and east of our region.

Be sure to check back for the latest updates on the forecast in southern Ontario.

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