Severe Weather Threat Overnight Monday

There will be a threat of severe weather overnight Monday into early Tuesday morning.

A mesoscale convective system (MCS) will move into Southwestern Ontario late in the evening. At this time, it is believed that it will move into the area after 9 PM EDT. There is still a fair amount of uncertainty with the exact timing and if the MCS will retain its strength as it moves into the region.

Area Breakdown:

The area with the largest threat will be Southwestern Ontario, including Windsor, Chatham, London and Sarnia, which are seen in the Elevated/Yellow region. In these areas, threats will include heavy rain, the risk for an isolated tornado, damaging winds of near 100 km/h, small hail, and localized flooding.

The risk will diminish further east. The Low/Dark Green area includes Woodstock, Simcoe, Stratford, Brantford and Seaforth. The threats in these areas will include heavy rain, small hail and wind gusts of up to 80 km/h.

The Very Low/Light Green area includes Goderich, Listowel, Kitchener and Cayuga. The threats in these areas will include heavy rain and wind gusts of up to 80 km/h.

The Non-Severe area will mainly see heavy rain and frequent lightning. This area will likely see non-severe thunderstorms or showers off Lake Huron.

Because this event is occurring during the overnight hours, it is highly recommended to have multiple ways to receive severe weather alerts issued by Environment Canada. More details will be posted when they become available.