Fiji, Tonga: Tropical Cyclone Ana causes some damage, disruptions, but continues to weaken, as of early Feb. 1 /update 3

Event

Tropical Cyclone Ana continues to weaken early Feb. 1 after impacting Viti Levu Island Jan. 30 and 31 and Kadavu Island, Jan. 31. As of 0001 Feb. 1, the system's center of circulation was approximately 150 km (93 miles) south of Suva. Forecast models indicate that the storm will continue to weaken as it tracks southwards away from Fiji and Tonga. Some uncertainty remains in the track and intensity forecast, and changes could occur over the coming days.

The storm caused some minor damage and localized flooding in Fiji. Local authorities have indicated that businesses and public transport will operate as per normal from Feb. 1. Schools will remain closed. Updated damage assessments are likely to be released by the authorities in the next 12-24 hours.

Government Advisories
As of 0107 FJT Feb. 1, the Fiji Meteorological Service maintains a tropical cyclone warning for much of the country and has forecast strong winds for Viti Levu Island and Kadavu Island. Additionally, as of 0200 Feb. 1, Tonga Meteorological Services maintains a damaging winds warning for much of Tongatapu. Authorities could issue new warnings or update existing advisories until the system dissipates. Weather warnings could remain active even after the system's immediate threat has diminished, as some areas may still be highly susceptible to rain-induced hazards. Officials could order localized evacuations if weather conditions prove particularly hazardous.

Additional warnings for Tropical Cyclone 16P, located north of Fiji, are likely to be issued in the coming hours.

Hazardous Conditions
Heavy rainfall and strong winds will likely continue to impact Fiji in the coming days following the impact of Ana and the approach of 16P. Sustained heavy rainfall could trigger further flooding in low-lying communities near streams, creeks, and rivers, as well as in urban areas with easily overwhelmed stormwater drainage systems. Sites located downstream of large reservoirs could experience flash flooding after relatively short periods of intense rainfall. Flooding could isolate some communities for several days. In addition to the heavy rain, flooding, and storm surge, damaging wind gusts will persist. Widespread and prolonged power outages due to uprooted trees and toppled utility lines are likely.

Transport
Inclement weather associated with the storm systems could trigger localized business, transport, and utility disruptions through at least Feb. 2. Floodwaters and debris flows may render some bridges, rail networks, or roadways impassable, impacting overland travel in and around affected areas. Areal flooding in urban locations could also result in severe traffic congestion, while strong winds will pose a hazard to high-profile vehicles. Heavy rain and low visibility may trigger flight disruptions at airports, including Suva's Nadi International Airport (NAN). Disruptions caused by inclement weather and resultant hazards, such as flooding, could persist well after conditions have improved. If there is severe damage to infrastructure, repair or reconstruction efforts may exacerbate residual disruptions.

Advice

Heed all evacuation orders, if issued. Use extreme caution in low-lying coastal areas and near streams, creeks, and other waterways due to the high potential for severe flooding and storm surge. Stockpile water, batteries, and other essentials in advance. Charge battery-powered devices when electricity is available; restrict the use of cellular phones to emergencies only. Power down mobile devices when not in use. Keep important documents in waterproof containers. Observe strict food and water precautions, as municipalities could issue boil-water advisories following flooding events. Take precautions against insect- and waterborne diseases in the coming weeks. Keep any necessary medications in a waterproof container.

Plan accordingly for commercial, transport, and logistics disruptions in areas in the path of the storm, especially if vital infrastructure is damaged. Seek updated information on road conditions before driving or routing shipments through areas where flooding has occurred. Confirm flights before checking out of hotels or driving to the airport; clearing passenger backlogs may take several days in some locations.

Resources

Joint Typhoon Warning Center
Fiji Meteorological Service Facebook
Energy Fiji Limited Facebook
Water Authority of Fiji Facebook
Tonga Meteorological Services