News Alerts

16 Sep 2020 | 05:28 AM UTC

US: Hurricane Sally weakens to Category 1 hurricane September 15 /update 3

United States of America News Alert

Hurricane Sally weakens to Category 1 hurricane on September 15; strong winds, heavy rainfall, and storm surge expected along portions of the northern Gulf Coast

TIMEFRAME expected from 9/15/2020, 12:00 AM until 9/19/2020, 11:59 PM (America/Chicago). COUNTRY/REGION Florida, Alabama, Mississippi, Louisiana, Georgia, North Carolina, South Carolina

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Event

Hurricane Sally weakened to a Category 1 hurricane on Tuesday, September 15, as it approaches the coast of Alabama. According to the National Hurricane Center (NHC)'s 19:00 (CDT) advisory, Sally is located 72km (45mi) south of Dauphin Island (Alabama) and is sustaining winds of up to 130kph (80mph). Sally is currently forecast to remain at Category 1 prior to landfall in the vicinity of Gulf Highlands (Alabama) during the evening of Wednesday, September 16, before it weakens as it moves across southeastern Alabama. At least 19,000 people are currently without power in the Mobile (Alabama), and property damage has already been reported in some areas. Both Mobile Regional Airport (MOB) and Pensacola International Airport (PNS) have closed during the hurricane's passage.

The NHC has warned that Sally will produce up to 508mm (20in) of rainfall over the central Gulf Coast from the Florida Panhandle to southeast Louisiana. Rainfall may reach up to 762mm (30in) in some areas and produce life-threatening flash flooding. Up to 203mm (8in) of rainfall, rising to 305mm (12in) in isolated areas, is possible across southeastern Mississippi, southern and central Alabama, central and northern Georgia, and the western Carolinas. The NHC also warned that a dangerous storm surge of up to 2m (6ft) is expected in some areas, and flooding resulting from the surge has been reported in Alabama, Florida, Mississippi, and Louisiana. At least 11,000 homes are at risk of exposure to the surge in Alabama and Mississippi.

The NHC has issued the following watches and warnings:  

  •  A hurricane warning between east of Bay St. Louis (Mississippi) and Navarre (Florida)
  •  A tropical storm warning east of Navarre  and Indian Pass (Florida) and Bay St. Louis and Grand Ilse (Louisiana)
  •  A storm surge warning between the mouth of the Mississippi River to Okaloosa/Walton county (Florida), and for Mobile Bay (Alabama)

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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