Alertes de sécurité

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15 sept. 2020 | 05h03 UTC

US: Hurricane Sally strengthens to Category 2 hurricane September 14 /update 2

United States of America Alerte de sécurité

Hurricane Sally strengthens to Category 2 hurricane on September 14; strong winds, heavy rainfall, and storm surge expected along portions of the northern Gulf Coast

TIMEFRAME expected from 15/9/2020, 12h00 until 19/9/2020, 11h59 (America/Chicago). COUNTRY/REGION Florida, Alabama, Mississippi, Louisiana

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Event

Hurricane Sally has strengthened to a Category 2 hurricane Monday, September 14, as it moves northwest near the coast of Louisiana and Alabama. According to the National Hurricane Center (NHC)'s 16:00 (CDT) advisory, Sally is located 218km (135mi) southeast of Mobile (Alabama) and is sustaining winds of up to 161kph (100mph). Forecasters have warned that Sally may strengthen to a Category 3 hurricane prior to making landfall between Tuesday, September 15, and Wednesday, September 16, potentially to the west of Mobile.

The NHC has warned that Sally will produce up to 406mm (16in) of rainfall over the central Gulf Coast from the Florida Panhandle to southeast Louisiana. Rainfall may reach up to 610mm (24in) in some areas and produce life-threatening flash flooding. Minor to moderate river flooding is also likely across Alabama and Mississippi. The NHC has also warned that a life-threatening storm surge is expected in some areas, and flooding resulting from the surge has already been reported in Alabama, Florida, Mississippi, and Louisiana.

The NHC has issued the following watches and warnings:  

The governors of Alabama and Mississippi have declared states of emergency. In Mississippi, authorities assembled sandbag stations, ordered boat owners to move their vessels out of city marinas and harbors, and closed islands and areas of national parks along the coastline. Campers at the Davis Bayou campground were told to evacuate by 09:00 on Sunday, September 13. Authorities in Alabama have recommended that coastline areas of the state be evacuated, particularly in Baldwin and Mobile counties. Mandatory evacuation orders are in place in both Mississippi and Louisiana.

The following areas are under mandatory evacuation orders in Mississippi:

The following areas are under mandatory evacuation orders in Louisiana:

Wind damage, coastal flooding, and dangerous sea conditions are expected during the passing of the storm, and significant disruptions to transportation, business, and utilities are likely in the coming days.

Context

The Atlantic hurricane season runs from late May through to the end of November, with activity typically peaking in late August and early September. Numerous tropical storms form in the Atlantic Ocean during this period, with most affecting the Caribbean, the Gulf of Mexico, and the east coast of the United States. Although communities in the region are generally well prepared for adverse weather conditions during the hurricane season, severe storms bring a significant risk of flooding and infrastructural damage.

Organized tropical activity tends to peak in August and September. Storms tend to flood sections of highways and cause dirt-based roads to become temporarily impassable. More organized systems, depending on intensity, can prove catastrophic in terms of tidal surge, wind damage, flooding, and mudslides.

Advice

Those in the above areas are advised to monitor local weather reports, avoid areas directly affected by flooding, confirm road conditions before setting out, and adhere to instructions issued by local authorities.

 

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