Environment Canada has issued a rainfall warning for Thunder Bay, as heavy rain is expected to hit the area starting this evening and continuing through Friday, April 24, 2026. Residents are being warned to prepare for 30 to 50 millimetres of rain, with the incoming weather system bringing a risk of thunderstorms.
The Lakehead Region Conservation Authority reports that the ground across the region remains frozen, which significantly reduces the soil’s ability to absorb water. Because the ground cannot soak up the incoming rain, officials warn that water will likely pool on roads, in parking lots, and in other low-lying areas. There is also a risk of washouts occurring near rivers, creeks, and culverts.
The current situation is compounded by an above-average snowpack from the past winter, which remains thicker than normal for this time of year. With the Neebing-McIntyre Floodway currently frozen over, it is unable to provide its usual capacity to help divert excess water.
Authorities are urging residents to exercise caution and avoid driving through any flooded roadways. The Lakehead Region Conservation Authority, which has been monitoring the area since issuing a flood outlook on April 14, 2026, and a subsequent flood watch on April 17, 2026, continues to track the local impact. Residents can find more information through the Ontario Ministry of Natural Resources.
