From: 2026/06/17, 16:30
To: 2026/06/19, 09:00

The Niagara Peninsula Conservation Authority (NPCA) is advising the public and local municipalities of the potential for flooding within its jurisdiction late Wednesday June 17 into Thursday June 18, 2026. This includes the Niagara Peninsula, the southeastern portion of the City of Hamilton, and the eastern portion of Haldimand County. The Niagara Peninsula Watershed is currently under a Special Weather Statement, with forecasted rainfall up to 40 mm or greater with the risk of severe thunderstorms moving into the area this evening near midnight. These storms may also produce gusts of 70 to 90 km/h with heavy downpours of rain of up to 20 mm/hour in some locations. Some watercourses are still draining the precipitation/runoff from the storm this past Sunday and are expected to respond rapidly to these rainfall amounts and intensities. While the NPCA does not anticipate major flooding along larger watercourses, nuisance flooding in low-lying areas adjacent to smaller streams and creeks is likely. This notice remains in effect until 9:00 AM on Friday, June 19, 2026, and will be updated as conditions warrant.

From: 2026/06/18, 02:00
To: 2026/06/18, 07:23

Yellow warning - wind - in effect Strong southwesterly winds are expected. What: Southwesterly winds gusting 70 to 90 km/h. When: Overnight into Thursday afternoon. 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.

From: 2026/06/17, 20:00
To: 2026/06/18, 07:01

Heavy rain and thunderstorms tonight. What: Rainfall amounts in excess of 40 mm. Risk of severe thunderstorms. When: Beginning early this evening continuing overnight. Additional information: Showers are expected early this evening and will intensify as a strong low pressure system approaches the area. There is a potential for severe thunderstorms late this evening and overnight with heavy rain and strong wind gusts being the primary threats. Rainfall amounts of 40 mm or greater are possible as a result of the thunderstorms and showers with this system. Watches or warnings may be issued closer to the event as the path of this low pressure system becomes more certain. ### 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.