North Atlantic Ocean: Tropical Storm Wanda tracking south early Nov. 6. Close approach to Azores region, Portugal Nov. 7 /update 1

Event

Tropical Storm Wanda is tracking south across the North Atlantic Ocean early Nov. 6. As of 09:00 GMT, the storm's center of circulation was approximately 995 km (620 miles) west of the Azores region, Portugal. Forecast models indicate the system will maintain its strength as it turns sharply to track northeast the afternoon of Nov. 6 before making a close approach to the Azores region, Portugal the afternoon of Nov. 7, passing northwest of the islands. The storm is forecast to transition into a post-tropical cyclone with tropical storm strength winds early Nov 8 while continuing to track northeast, likely making a close approach to Ireland the evening of Nov. 8, passing west of the country. Some uncertainty remains in the track and intensity forecast, and significant changes could occur in the coming days.

Government Advisories
As of 09:00 GMT Nov. 6, no watches or warnings in relation to the system have been issued. Portuguese officials are likely to issue warnings and/or watches in response to the developing system as the system approaches the Azores.

Hazardous Conditions
Sustained heavy rainfall could trigger flooding in low-lying communities and urban areas with easily overwhelmed stormwater drainage systems. Flooding could trigger flash floods and mudslides, isolating some communities for several days.

Prolonged sea swells and storm surge generated by the system may result in coastal flooding. Persistent onshore flow could make it difficult for the surge to recede and for water levels to decrease in coastal river catchments. Wanda could also produce damaging wind gusts, resulting in power outages due to fallen trees and toppled utility lines.

Transport
Inclement weather associated with the storm could trigger localized business, transport, and utility disruptions. Floodwaters and debris flows may render some bridges 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 regional airports.

Disruptions triggered 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

Activate contingency plans in areas where officials forecast adverse conditions. Heed all evacuation orders. 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.

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

US National Hurricane Center
Portuguese Institute for Sea and Atmosphere