From: 2026/06/17, 18:00
To: 2026/06/18, 05:03

Conditions are favourable for the development of severe thunderstorms that may be capable of producing strong wind gusts and heavy rain. What: Wind gusts of 100 km/h. Total rainfall amounts of 40 to 60 mm over a few locations. Risk of tornadoes. When: This evening, possibly continuing after midnight. Additional information: Showers are expected to intensify as a strong low pressure system approaches the area. Strong winds and heavy rain are possible with thunderstorms along with the risk of tornadoes. ### Utility outages are possible. Heavy rain can cause flash flooding and significant reductions to visibility. Severe thunderstorm watches are issued when conditions are favourable for the development of thunderstorms capable of producing damaging hail, wind or rain. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to [email protected] or post reports on X using #ONStorm. For more information: https://www.ontario.ca/page/be-prepared-emergency.

From: 2026/06/18, 02:00
To: 2026/06/18, 07:24

Strong southwesterly winds are expected. What: Southwesterly winds gusting 70 to 90 km/h. When: Overnight into Thursday morning. Additional information: Southwesterly winds gusting 70 to 90 km/h are expected to develop as a strong low pressure system tracks over southern Ontario. ### Local utility outages are possible. Damage to roofs, fences, branches or soft shelters is possible. Some property damage is possible. Wind warnings are issued when there is a significant risk of damaging winds. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to [email protected] or post reports on X using #ONStorm.