Severe Thunderstorms Possible Through Southern Ontario Early Monday Morning
/Valid: Monday, September 7, 2020
NOTE: The tornado risk zone outlines the region with the highest probability of tornadoes, but tornadoes may occur outside of the zone.
Timing |
Southwestern: 12AM - 7AM
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Not sure what region you are in? Click here for a map showing the regions across Southern Ontario. Northeastern Ontario is north of North Bay (not shown on map).
Thunderstorm Threatcast
Thunderstorm Confidence |
Very High (90%) |
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Severe Confidence |
Low (25%) |
Tornadoes |
Isolated |
Max Wind Gusts |
100+ kmh | 62+ mph |
Max Hail Size |
Quarter |
Max 24-hr Rainfall |
~75 mm | ~3" |
Forecast Discussion
A developing cluster of storms currently located over Michigan late Sunday evening is expected to track across Lake Huron and into Southwestern Ontario after midnight. These storms have the potential to become severe especially right as they make landfall around the Lake Huron shoreline and extending into Extreme Southwestern Ontario.
Strong wind gusts in excess of 90-100km/h are the main threat with these storms along with small hail and very frequent lightning strikes. Flash flooding could also be a concern with the slow-moving nature of these storms. An isolated tornado cannot be completely ruled out, especially later in the morning and very early afternoon so be sure to have a plan in place should a Tornado Warning be issued for your area.
This line of storms will slowly decay throughout Monday morning as to track towards the east. All severe risk should come to an end shortly after sunrise around 7-9 am with scattered showers and embedded non-severe thunderstorms remaining. There is a questionable severe risk later in the day on Monday for Eastern Ontario - we’ll issue a separate forecast if it’s necessary.
