During October and November 2025, a series of back-to-back Pacific storm systems brought steady rainfall across the central coast of British Columbia. Such events are a common occurrence in the Pacific Northwest and are intensifying in a warmer climate.

In late March 2025, the Crowe Valley Conservation Authority issued a Flood Watch across the watershed in response to a forecasted storm system and ongoing spring runoff. Forecasted rainfall, saturated soils, and an above-average snowpack created the right conditions for elevated streamflows, particularly in the Crowe River watershed. With a peak spring snow water equivalent (SWE) of 149.2 mm, the basin was primed for rapid hydrologic response—culminating in a strong single peak on April 6, when flows at Water Survey of Canada hydrometric Station 02HK005 reached 45.2 m³/s.

In early April 2025, the St. Clair Region Conservation Authority issued a Flood Warning for the Sydenham River watershed, anticipating a significant rise in flows as a forecasted weather system approached the region. With much of the snowpack already depleted— leaving a modest 39.1 mm of snow water equivalent (SWE)— the primary concern was intense rainfall over already saturated ground. For the Sydenham River at Florence (Station 02GG003), this event culminated in a peak flow of 169.0 m³/s on April 4, surpassing the 2-year flood threshold of 143.3 m³/s and coming close to the 5-year return period marker of 183.7 m³/s.