The rainfall may be heavy at times, with a few thunderstorms also possible.
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There is potential for up to 40 mm of rain and strong winds gusting up to 70 km/hr beginning overnight.
A clap or two of thunder is also possible, along with rainfall approaching 50 mm in 24 hours, says Environment Canada.
However, a low pressure system over Louisiana containing moisture from the remnants of Hurricane Patricia is now moving northward towards the Great Lakes and is expected to intensify into a “fairly strong fall storm” as it enters into Ontario, says Environment Canada.
The national weather agency expects “a large shield of rain” associated with the storm to spread into southwestern Ontario Tuesday night, reaching the Golden Horseshoe area by Wednesday morning.
Downed power lines, tree limbs on lines, sparking electrical equipment, and power outages can be reported via London Hydro’s 24/7 emergency number at 519-661-5555. “We’ll maybe see a few impact on groundwater, because groundwater will usually be recharging, and if you have a well for example, you might see, in the long-term, a few differences in your well levels”.
The Hamilton Conservation Authority is advising of the possibility for localized flooding in low-lying areas within the watershed, as a result of anticipated rainfall on Wednesday.
The City of London is reminding residents and businesses to be prepared and take precautions when travelling during the storm.
McKinnon asks people with backwater valves installed on their sewers to follow manufacturing instructions for cleaning to make sure it’s functioning properly.
If your home is prone to flooding, get valuable items off the basement floor. Rainfall amounts of between 30 to 50 mm are expected with an additional 10 to 20 mm in isolated areas.
Keep your eaves troughs clean.
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Friday should be dry, under a mix of sun and cloud, with a high of 9. The expected low is 8 C.
