North Atlantic Ocean: Tropical Storm Henri tracking west-southwestward in the North Atlantic Ocean early Aug. 17 /update 2

Event

Tropical Storm Henri is tracking west-southwestward in the North Atlantic Ocean early Aug. 17. As of 05:00 AST Aug. 17, the storm's center of circulation was approximately 215 km (135 miles) south-southeast of Bermuda. Forecast models indicate the system will generally strengthen as it tracks clockwise in the North Atlantic Ocean over the coming days; the storm will move westward from the afternoon of Aug. 17 into early Aug. 19. The system is subsequently forecast to maintain its strength as it turns northwestward through Aug. 19 before ultimately turning northeastward from Aug. 20. The center of the storm is forecast to track well to the south of Bermuda late Aug. 17. Some uncertainty remains in the track and intensity forecast, and significant changes could occur in the coming days.

Government Advisories
As of 05:00 AST Aug. 17, the following warnings and watches are in effect:

• Tropical Storm Watch: Bermuda

Officials could issue new warnings and/or watches in response to the developing system in the coming days.

Hazardous Conditions
The storm may bring rainfall that is heavy at times, gusty winds, and rough seas to coastal areas of Bermuda through at least Aug. 18. Sustained heavy rainfall could trigger flooding in low-lying communities near streams, creeks, and urban areas with easily overwhelmed stormwater drainage systems. Torrential precipitation could trigger flash floods and mudslides.

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. In addition to the potential heavy rain, flooding, and storm surge, the storm could produce damaging wind gusts, resulting in power outages due to fallen trees and toppled utility lines.

Transport
In addition to the immediate threat to personal safety, inclement weather associated with the storm could trigger localized business, transport, and utility disruptions. Floodwaters and debris flows could 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. Possible 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 weather 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 weather 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 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 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.

Resources

US National Hurricane Center
National Weather Service
Bermuda Weather Service