South Pacific: Tropical Low 26 forms in the South Pacific Ocean as of May 18

Event

Tropical Low 26 has formed in the South Pacific Ocean as of late May 18. As of 23:00 VUT, the storm's center of circulation was approximately 330 km (205 miles) north-northeast of Port Vila, Vanuatu. Forecast models indicate the system will strengthen slightly into a category 1 tropical cyclone as it tracks generally southwestward before making landfall over Maewo Island, Vanuatu, May 19. The storm system will maintain strength as it tracks across central Vanuatu May 19, making further landfalls over Ambae and Malo islands. The storm is then forecast to weaken back to a tropical low as it tracks generally southwest into the Coral Sea May 20-21, before taking a turn to track south-southeastward and dissipating into a tropical depression north of New Caledonia May 22. Some uncertainty remains in the track and intensity forecast; changes could occur in the coming days.

As of late May 18, the Vanuatu Meteorology and Geo-Hazards Department have issued severe weather warnings for strong inland winds over most of Vanuatu. People are advised to take extra precautions for possible flying or fallen objects. Marine strong wind warnings have also been issued for all Vanuatu waters due to rough seas. Authorities will likely issue new warnings or update existing advisories throughout the system's progression in the coming days.

Sustained heavy rainfall could trigger flooding in low-lying areas and those with easily overwhelmed drainage systems. If weather conditions prove hazardous, localized evacuations, flash flooding, and landslides are possible.

The inclement weather could trigger localized business, transport, and utility disruptions and render some bridges or roadways impassable. Flight disruptions at regional airports and temporary closures of ports are also possible. Stagnant pools of water during and after flooding increase insect- and waterborne diseases, such as dengue fever, cholera, and malaria. Exposure to raw sewage and other hazardous materials mixed with floodwaters poses a serious health threat.

Advice

Activate contingency plans in areas where officials forecast tropical storm conditions. Heed any evacuation orders that may be issued. Use extreme caution in low-lying coastal areas and near streams, creeks, and other waterways due to the 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 and necessary medications 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.

Plan accordingly for protracted 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
Vanuatu Meteorology and Geo-Hazards Department
Meteo France New Caledonia