Weather Alert Issued by the Niagara Peninsula Conservation Authority
Posted July 27, 2026 on Niagara At Large
The Niagara Peninsula Conservation Authority (NPCA) is advising the public and local municipalities of the potential for flooding within its jurisdiction in the afternoon of Monday July 27th, 2026. This includes the Niagara Peninsula, the southeastern portion of the City of Hamilton, and the eastern portion of Haldimand County.
There is a risk of severe thunderstorms capable of producing torrential rainfall – between 50 – 75 mm – arriving this evening and into tomorrow morning. Given the instability of storm behaviour during this time of year, there remains some uncertainty as to where the highest rainfall amounts will be.
While the NPCA does not anticipate major flooding along larger watercourses, flash flooding in urbanized and low-lying areas is likely to occur. Overland surface runoff may also occur in flat, poorly drained rural areas – typically within floodplains – during intense rain events when culverts and ditches become overwhelmed and force water to spread outside of defined channels.
Residents are strongly urged to stay clear of all creeks, rivers, and waterbodies due to slippery banks and elevated water levels, which pose significant hazards. Property owners are encouraged to safely ensure that drainage features-such as culverts, catch basins, and ditches-are free of debris. Secure basement windows or doors which may be reached by flood waters. Municipal and Regional staff are similarly advised to inspect and clear local stormwater infrastructure.
The NPCA will continue to monitor conditions closely and issue updates as required. Current flood status information is available at:
* https://npca.ca/flood-status<https://npca.ca/flood-status?utm_source=copilot.com>
* https://npca.ca/stream-flow-monitoring<https://npca.ca/stream-flow-monitoring?utm_source=copilot.com>
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