Trail NewsWest Kootenay - Boundary region under severe thunderstorm watch: Environment CanadaSevere thunderstorm watchPhoto: File A yellow level severe thunderstorm watch has been issued for the West Kootenay - Boundary region by Environment Canada. A severe thunderstorm watch has been issued for the West Kootenay and Boundary regions, Environment Canada (EC) warned this afternoon. The forecast confidence is “high” for the evolution of a storm — but with a moderate impact level — as the yellow alert prepares to drop. A yellow alert indicates hazardous or potentially disruptive weather conditions that are moderate, localized and short-term. Severe thunderstorm watches are issued when conditions could progress into thunderstorms capable of producing damaging hail, wind or rain.