Réunion Island’s Remarkable Rainfall Records and Their Causes

Réunion Island set multiple world records for rainfall due to Cyclone Giselle in 1964 and another storm in 2007. The island recorded extreme measurements including 66.49 inches in 18.5 hours from the cyclone and 194.33 inches over 96 hours during the 2007 storm. Its distinctive terrain and location in the Indian Ocean contribute to its intense rainfall patterns.

Réunion Island, situated in the southern Indian Ocean, achieved remarkable rainfall records due to two storms in late February. Notably, during February 28-29, 1964, Category 1 Cyclone Giselle resulted in extraordinary rainfall measurements at the Belouve station, which include: 30.16 inches within 6 hours, 42.79 inches in 9 hours, 52.76 inches over 12 hours, and 66.49 inches in 18.5 hours. These figures are almost equivalent to Miami’s annual average rainfall of 67.41 inches, recorded within a 24-hour period.

Furthermore, 18 years ago, from February 24-27, 2007, Réunion Island experienced another historic rainfall event. The Cratère Commerson station recorded 154.72 inches over 72 hours and an astounding 194.33 inches over 96 hours, both of which maintain their status as current world records as verified by the World Meteorological Organization.

The island’s unique geographical setting significantly contributes to its heavy rainfall. As a location prone to South Indian Ocean tropical cyclones, Réunion Island’s volcanic peaks surpassing 10,000 feet pose a barrier for moist winds from slow-moving storms, leading to intensified rainfall rates due to orographic lift.

This account appears in the latest edition of The Morning Brief newsletter, a daily publication by The Weather Channel, which delivers updates from expert meteorologists.

In summary, Réunion Island holds several world records for extreme rainfall measurements, significantly influenced by its geographical features and the occurrence of tropical cyclones in the region. The recorded rainfalls, both from Cyclone Giselle in 1964 and a storm in 2007, emphasize the exceptional weather conditions experienced on the island. These phenomena highlight the unique challenges posed by Réunion’s topography and climate, warranting further observation and study.

Original Source: weather.com