A katakana weather term for a storm. In everyday Japanese, 嵐 or 暴風雨 may sound more native, while ストーム is common in translated weather terms and compounds such as 熱帯性ストーム.
熱帯性ストームが島に接近している。
A tropical storm is approaching the island.
A tropical storm formed over the Pacific.
That island is hit by storms every year.