Hurricane Lee was a long-lived and intense tropical cyclone that impacted Bermuda, the Northeastern United States, and Eastern Canada in September 2023. Lee formed on September 5 from a tropical wave that had moved offshore from West Africa into the tropical Atlantic a few days earlier. A strong steering current caused the storm to track northwestward, far from the northern Leeward Islands. Highly favorable conditions enabled Lee to rapidly intensify to a Category 5 hurricane on September 7; its winds increased by in 24 hours. This makes it the sixthfastest rapid intensification on record in the Atlantic, only behind Hurricane Wilma in 2005, Hurricane Felix in 2007, Hurricane Erin in 2025, Hurricane Milton in 2024, and Hurricane Matthew in 2016. Just as quickly however, Lee's strength waned, and it fluctuated in intensity for several days on account of strong wind shear and multiple eyewall replacement cycles.
On September 13, the system rounded the southwest side of a large ridge of high pressure over the central Atlantic, turned, and accelerated northward. Lee soon entered into an environment of increasing wind shear and moved into increasingly cooler water, causing the system to slowly weaken as it passed near Bermuda and New England. As a result, Lee transitioned into an extratropical cyclone on September 16. The cyclone then made landfalls in Nova Scotia, New Brunswick, Prince Edward Island, and in Newfoundland and Labrador, before moving out into the far northern Atlantic on September 18, where it merged with another extratropical low.
Rip currents caused one fatality in Puerto Rico when a 66-year-old man drowned at Poza del Obispo. Additionally, Lee generated dangerous surf and rip currents along the entire Atlantic coast of the United States. Lee produced hurricane-force winds gusts, along with flooding rains, mostly in Maine and Atlantic Canada. Consequently, approximately 200,000 power outages occurred in the United States, mostly in Maine, and a similar number in the Canadian provinces of New Brunswick and Nova Scotia. Maine and Atlantic Canada also reported many downed trees and power lines, as well as flash flooding, leading to road closures. Additionally, abnormally high tides and storm surge destroyed some roadways and a boardwalk in the Halifax area of Nova Scotia. Three storm-related fatalities occurred in the mainland of the United States: a 15-year-old boy drowned in Fernandina Beach, Florida; a 50-year-old man died in Searsport, Maine, when a tree fell onto the car he was in; and a 21-year-old man who was killed in Manasquan Inlet, New Jersey when the boat he was in capsized and sunk due to a tall wave. Total damage from the storm is estimated at $80 million.
Meteorological history
On September 1, a tropical wave emerged into the tropical Atlantic from the west coast of Africa producing disorganized shower and thunderstorm activity, and began to gradually organize. A broad surface low formed by September 4, which acquired multiple low-level bands developing and a well-defined center on September 5. Consequently, Tropical Depression Thirteen developed at 12:00 UTC that day about halfway between the west coast of Africa and the Lesser Antilles.
Amid favorable conditions for intensification, the depression quickly strengthened into Tropical Storm Lee six hours later and then a hurricane by late on September 6. Lee tracked west-northwestward, steered by a mid-level ridge located to its north, and continued to intensify as it became better organized, with increased convective banding, development of a central dense overcast, and formation of a ragged eye, evident in visible satellite imagery by the following afternoon. By 21:00 UTC on September 6, the system strengthened into a Category 1 hurricane on the Saffir–Simpson scale while located far to the east of the Northern Leeward Islands. Explosive intensification began the next day, with Lee reaching Category 2 strength at 15:00 UTC, then reaching Category 4 strength at 21:00 UTC, as its eye cleared. A few hours later, a hurricane hunters mission into the storm found that it had reached Category 5 strength, and possessed a clear eye surrounded by convective cloud tops with temperatures as low as . By 06:00 UTC on September 8, Lee's maximum sustained winds reached , an increase of in 24 hours, making it the sixthfastest intensifying Atlantic hurricane on record, surpassed by Matthew in 2016, Hurricane Erin in 2025,Milton in 2024, Felix in 2007, and Wilma in 2005. During this same time period, the hurricane's minimum barometric pressure fell to . However, increasing southwesterly wind shear quickly caused Lee's eye to become cloud filled and the storm became more asymmetric, weakening it back to a high-end Category 4 hurricane. The pace of weakening quickened as the day progressed, and Lee fell below major hurricane status by late on September 9. Data from an evening hurricane hunters mission indicated that the storm was undergoing an eyewall replacement cycle and was still being adversely affected by wind shear.
By September 10, wind shear abated, and the eyewall replacement cycle was completed, permitting the new, larger-diameter eye to contract and to grow more symmetric. As a result, Lee intensified to a Category 3 major hurricane strength on the Saffir–Simpson scale once again that same day. Another series of eyewall replacement cycles led to fluctuations in its size and intensity, but Lee remained a major hurricane throughout. After tracking west-northwestward to northwestward for much of its transAtlantic journey, Lee turned northward on September 13, moving around the western side of the steering subtropical ridge. That same day, it also weakened to Category 2 strength. Then, on the morning of September 14, Lee became a Category 1 hurricane while approaching Bermuda, passing to the west by later in the day. As the hurricane pushed northward, continued drier air entrainment and increasingly strong southerly wind shear displaced Lee's convection to the northern side of the system, weakening it further. These factors caused the hurricane to commence its extratropical transition, which was completed by 06:00 UTC on September 16. The cyclone then made landfalls in Nova Scotia, New Brunswick, Prince Edward Island, and in Newfoundland and Labrador, before moving into the northern Atlantic and merging with another extratropical low late on September 18.
Preparations
Bermuda Bermuda received tropical storm watches on September 12, which were later upgraded to warnings on September 13. The House of Assembly moved their September 15 meeting date to September 22.
United States A hurricane watch and a tropical storm watch were issued for the New England coastline from Rhode Island to Maine, including Block Island, Martha's Vineyard and Nantucket, on September 13. A storm surge watch was also issued for Cape Cod Bay and Nantucket, although this alert was cancelled when the storm veered further to the east.
A wind advisory was put into effect for New Hampshire's White Mountains, where wind would be stronger due to elevation.
New York State Governor Kathy Hochul deployed fifty National Guard members to Long Island in preparation of the storm's possible arrival. The New York City Emergency Management Department advised coastal communities in the city to review their emergency plans. On September 15, the town of Southampton declared a state of emergency, shutting down coastal roads. The same day, the town of East Hampton prohibited swimming at all beaches.East End preps for effects of Hurricane Lee; Town of East Hampton prohibits swimming, News 12 Long Island, September 15, 2023
In Massachusetts, boats on Nantucket were pulled from the water or were sheltered in protected harbors. All Hy-Line Cruises service was canceled between Martha's Vineyard and Hyannis, and from Martha's Vineyard to Nantucket. The Steamship Authority waived change and cancellation fees for ferries between September 15 and 17. On September 14, Boston Mayor Michelle Wu announced the opening of an emergency operations center. Preparations to place sand bags and flood walls if necessary were also made. The Boston Police and Fire Departments were put on standby. On September 15, Massachusetts Governor Maura Healey announced a state of emergency in response to the cyclone. Healey also announced that 50 members of the Massachusetts National Guard capable of operating high-water vehicles were being activated in anticipation of any potential rescues.
The Rhode Island Department of Transportation cleaned out storm drains and cut down at risk trees to mitigate flood and wind risk. The Independent Man statue atop the Rhode Island State House in Providence was being taken down for repairs due to damage to the dome of the statue before any potential impacts by Lee could put it at risk.
Maine Governor Janet Mills declared a state of emergency and requested President Joe Biden to issue an emergency disaster declaration for the state, and he did so later that evening. Utility workers from as far as Tennessee were brought into the state to help quickly restore power in case of outages. Boat owners were advised to secure their boats by the Maine Harbor Master's Association. The White Mountains in Maine were also put under wind advisory. On September 16, about half of all flights to and from Portland International Jetport were canceled, while most flights were canceled to and from Bangor International Airport due to high winds. The National Park Service also shut down certain areas of Acadia National Park.Acadia closes several park areas in anticipation of Hurricane Lee, MD Islander, September 15, 2023
Canada Environment Canada issued hurricane watches for parts of Charlotte County, particularly its coast and Grand Manan Island in New Brunswick, as well as Nova Scotia's Digby, Yarmouth, Shelburne, and Queens counties. Further tropical storm watches were issued for southeastern New Brunswick as well as several parts of Nova Scotia. On September 15, Prime Minister Justin Trudeau announced that he had convened the Incident Response Group to discuss potential impacts from the cyclone and warned Canadians to take precautions and listen to their local officials.
Cancellations were made for cruise ships scheduled to stop at the Port of Saint John. On September 15, New Brunswick Emergency Measures Organization director Kyle Leavitt warned of hazardous driving conditions and urged residents to stay home. NB Power vice-president Nicole Poirier also announced that crews were put into position to respond to potential power outages. Many flights were canceled or delayed to and from Greater Moncton Roméo LeBlanc International Airport and Fredericton International Airport due to hazardous conditions on September 16 and 17. A senior director for energy delivery for Nova Scotia Power, Matt Drover, announced that utility crews were being mobilized throughout the province. Bay Ferries also canceled sailings of the MV Fundy Rose between September 16 and 17. Most flights to and from Halifax Stanfield International Airport were canceled.
Northumberland Ferries Limited canceled ferry crossings between Nova Scotia and Prince Edward Island on Saturday. Maritime Electric stationed utility crews throughout the province to respond to any potential power outages. Flights were also cancelled to and from Charlottetown Airport.
Elsewhere A tropical cyclone alert was in effect for the Leeward Islands and the British Virgin Islands on September 7–8. Additionally, a 5day high surf warning was issued for the British Virgin Islands on September 8.
On September 7, the United States federal government deployed food, water, and rapid response teams to Puerto Rico and the United States Virgin Islands.
Impact
Bermuda