Tropical Storm Hermine (2022)

Tropical Storm Hermine was a short-lived tropical cyclone that formed in the far eastern tropical Atlantic Ocean and brought record-breaking rains to the Canary Islands in September 2022. Hermine originated from a tropical wave first noted over West Africa on September 20. After emerging over the far eastern Atlantic Ocean, the system organized into a tropical depression on September 23. It soon became the eighth tropical storm of the 2022 Atlantic hurricane season as it progressed north. Increasing wind shear created a hostile environment for the cyclone and it failed to intensify beyond minimal tropical storm intensity as its convection was stripped far to the northeast. By September 24, Hermine's structure had sufficiently degraded to mark its degeneration into a remnant low. The residual system persisted for another two days before it was last noted over open ocean.

Hermine brought historic rainfall to the western Canary Islands over a three-day span. Accumulations reached 530 mm (20.87 in) in La Palma, more than 20 times the normal rainfall for the month of September. Many areas reported more than 100 mm (3.9 in) of rain throughout the event. The tremendous rainfall significantly disrupted air travel and damaged roads across the archipelago. Many structures suffered from flooding and total damage exceeded 10 million euro (US$9.8 million). Approximately 3,000 customers lost electricity, with service restoration taking up to five days in some locales. However, residents reported outages lasting longer than stated with one community remaining dark as of October 4. Repairs to roadways were expected to take at least five months.