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Mainly Non-Severe Thunderstorms Expected on Saturday

Thunderstorm Forecast, for Southern Ontario. Issued May 25th, 2019.
Thunderstorm Forecast, for Southern Ontario. Issued May 25th, 2019.

We are currently watching the risk for some mainly non-severe thunderstorms overnight tonight into the early afternoon hours on Saturday.

These thunderstorms are expected to be mainly non-severe with some possible strong storms along the shores of Lake Huron. This area of possible strong to very isolated severe storms extends from Tobermory south towards Owen Sound, Listowel and London as well as extending this risk through Chatham and Amherstburg. This area is highlighted in the 'area of interest.'

The remain threats for all these storms will include heavy rain and at times gusty winds. Small hail and frequent lightning can't be ruled out. In the case of a strong to isolated severe storm tomorrow morning, the main threats will be gusty winds briefly reaching near 90km/h and/or heavy rain reaching the 'flooding' criteria. We are not expecting these although the chance for is there.

These thunderstorms will develop over Michigan and move through portions of the Extreme South and Southwestern Ontario in the morning hours. These thunderstorms will continue east as they weaken, hence the lower risk from the 'area of interest'. As these storms enter the GTA and Central Ontario, embedded thunderstorms may be possible in some moderate showers. Small hail may still be possible, although, unlikely. Southwestern Ontario with start to clear up as this patch of showers and thunderstorms moves into portions of Central/Eastern Ontario into the early afternoon.

Into the afternoon, we are watching the risk for some severe thunderstorms, including the risks of gusty winds over 100km/h, moderate sized hail between 2-4cm and even an isolated tornado or two. We will be publishing a second forecast later in the morning/early afternoon on Saturday for this event. The link for that article can be found here:

Please let us know what your experiencing!

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