Tropical Storm Bebinca Scours Marianas With Heavy Rain and Erosion
In mid-September 2024, Tropical Storm Bebinca swept across Guam and the Northern Mariana Islands, bringing high winds and severe rain showers. Official event summaries confirmed localized urban flooding along the Sumay-Piti corridor on Guam as drainage systems overflowed. On the island of Saipan, intense rainfall runoff triggered significant gravel road erosion across active construction zones during the passage of Tropical Storm Bebinca. The departure of Bebinca was immediately followed by a powerful monsoon surge that prolonged heavy weather impacts across the region.
Urban Flooding and Emergency Shelter Operations: Bebinca Impacts on Guam
During the passage of Tropical Storm Bebinca near Guam, wind and rain intensities created notable localized disruptions across the island. Overall structural damage from Tropical Storm Bebinca remained minimal, limited primarily to fallen banana trees, dead tree limbs, and displaced political signs. Power outages occurred sporadically throughout the passage of Bebinca, though grid controllers restored electricity swiftly without widespread blackouts.
Flooding manifested in historic low-lying flood zones during the torrential rainfall accompanying Tropical Storm Bebinca. Water accumulated significantly along Route 1 in the Sumay-Piti corridor and near Polaris Point. In an abundance of caution due to memories of 2023 Typhoon Mawar, emergency authorities opened a community shelter where 28 residents evacuated during the height of Tropical Storm Bebinca. All evacuees returned safely to their homes on the same day once Tropical Storm Bebinca moved past the island.
Runoff Damage and Subsequent Monsoon Surge: Severe Road Erosion in Saipan
Across the Commonwealth of the Northern Mariana Islands, the impacts of Tropical Storm Bebinca varied considerably by geography. Rota and Tinian had no reports of damage or impacts. However, Saipan experienced distinct hydrological challenges fueled by the rain bands of Tropical Storm Bebinca.
Along western Saipan from San Antonio northward to Garapan, extensive highway infrastructure was under active construction with exposed gravel and dirt. The intense runoff generated by Tropical Storm Bebinca scoured these unpaved surfaces, creating deep ruts and severe road erosion. The damage from Tropical Storm Bebinca was subsequently amplified by a strong monsoon surge on September 16, where wind gusts and rainfall exceeded those measured during the initial passage of Tropical Storm Bebinca.