Each year western British Columbia experiences numerous land-falling atmospheric rivers (ARs), some of which can have devastating hydrological and geomorphological impacts on watersheds. For example, in November 2021, an AR river caused >200 mm of rainfall in a couple of days in parts of south-west British Columbia. This resulted in widespread flooding and mass movement events, disruption to road and rail infrastructure, and damages estimated at billions of dollars. Given concerns associated with climate change, we monitored two remote headwater streams in the Nechako River Basin over two field seasons to investigate land-falling ARs on water flows and the fluxes of suspended sediment. Numerous ARs were monitored with some causing >200 mm of rainfall in 4 days. Results show that ARs resulted in pronounced increases in water flows and suspended sediment concentrations (often >200 mg/L) causing excessive sediment fluxes that were orders of magnitude greater than fluxes prior to these events. These findings have important implications for understanding how watersheds respond to extreme weather and climate events.