The remnants of Tropical Storm Beryl, now Post-Tropical Cyclone Beryl, will move into Southern Ontario late Tuesday evening, brining heavy rain through the day on Wednesday and into Thursday.
Much of the region will see rainfall amounts of 40 to 50 mm, with the potential for any area to receive greater rainfall amounts due to torrential downpours and thunderstorms which will be localized. Some modelling has shown the potential for some areas to receive up to 100 mm of rain or greater. Due to the large uncertainties with how much rain will fall locally, we have kept the forecast at 40 to 50 mm, with a message that locally higher amounts are expected.
This Post-Tropical Cyclone will bring plenty of moisture, meaning flooding will be a large concern. Flash flooding will be possible due to torrential downpours which may produce large rainfall totals in only one hour, or a few hours. Roads may become impassable and washed out. Water levels in rivers and streams may rise quickly. Wind gusts up to 70 km/h will be possible as well.
Severe weather will also be possible tomorrow afternoon and evening. The exact locations that may be impacted remain uncertain at this time. More details will be posted tomorrow.
40 to 50 mm: Apsley, Barrie, Brantford, Brockville, Burlington, Chatham, Cornwall, Fort Erie, Frankton, Goderich, Grand Bend, Guelph, Hamilton, Hawkesbury, Kaladar, Kincardine, Kingston, Kitchener, Leamington, London, Midland, Mississauga, Niagara Falls, Orillia, Ottawa, Owen Sound, Port Colborne, Prince Edward, Sarnia, Simcoe, Southampton, St. Catharines, St. Thomas, Stratford, Tobermory, Toronto, Vaughan, Wallaceburg, Windsor and Woodstock.
These areas will also have the highest risk for flash flooding and overachieving rainfall totals due to torrential downpours.
30 to 40 mm: Algonquin Provincial Park, Bancroft, Barry's Bay, Bayfield Inlet, Burk's Falls, Haliburton, Huntsville, Parry Sound, Pembroke and Renfrew.
Special Weather Statements remain in effect for much of the region from Environment Canada. They continue to state that torrential downpours with rainfall rates of 20 to 40 mm per hour at times will be possible, as well as local rainfall amounts in excess of 50 mm.
Below is the latest track information form the National Hurricane Center, showing the arrival of the low pressure and the expected track areas.
