Timeline of the 2011 Atlantic hurricane season

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For broader coverage of this topic, see 2011 Atlantic hurricane season.
Timeline of the
2011 Atlantic hurricane season
A map of the tracks of all the storms of the 2011 Atlantic hurricane season
Season summary map
Season boundaries
First system formedJune 28, 2011
Last system dissipatedNovember 11, 2011
Strongest system
NameOphelia
Maximum winds140 mph (220 km/h)
(1-minute sustained)
Lowest pressure940 mbar (hPa; 27.76 inHg)
Longest lasting system
NamePhilippe
Duration14 days
Storm articles
Other years
2009, 2010, 2011, 2012, 2013

The 2011 Atlantic hurricane season was an event in the annual hurricane season in the north Atlantic Ocean. It was well above average, with 19 tropical storms forming.[nb 1] Even so, it was the first season on record in which the first eight storms failed to attain hurricane strength. The season officially began on June 1, 2011, and ended on November 30, 2011, dates that conventionally delimit the period of each year when most tropical cyclones develop in the Atlantic basin.[2] The season's first storm, Tropical Storm Arlene did not form until June 28. The final storm to develop, Tropical Storm Sean, dissipated on November 11.

There were 19 named storms altogether during the season, including seven hurricanes of which three intensified into major hurricanes.[nb 2] The two most significant storms, in terms of loss of life and damage, were Hurricane Irene and Tropical Storm Lee. Hurricane Irene was a powerful and unusually large storm that made several landfalls along the East Coast of the United States after peaking with maximum sustained winds of 120 mph (195 km/h).[4] Tropical Storm Lee was a disorganized tropical cyclone that moved ashore into Louisiana before producing historic flooding in the Northeast United States as an extratropical cyclone.[5]

This timeline includes information that was not operationally released, meaning that data from post-storm reviews by the National Hurricane Center, such as a storm that was not operationally warned upon, has been included. This timeline documents tropical cyclone formations, strengthening, weakening, landfalls, extratropical transitions, and dissipations during the season.

By convention, meteorologists use one time zone when issuing forecasts and making observations: Coordinated Universal Time (UTC), and also use the 24-hour clock (where 00:00 = midnight UTC).[6] The National Hurricane Center uses both UTC and the time zone where the center of the tropical cyclone is currently located. The time zones utilized (east to west) prior to 2020 were: Atlantic, Eastern, and Central.[7] In this timeline, all information is listed by UTC first with the respective regional time included in parentheses. Additionally, figures for maximum sustained winds and position estimates are rounded to the nearest 5 units (knots, miles, or kilometers), following the convention used in the National Hurricane Center's products. Direct wind observations are rounded to the nearest whole number. Atmospheric pressures are listed to the nearest millibar and nearest hundredth of an inch of mercury.

Timeline of events[]

Hurricane RinaHurricane Ophelia (2011)Hurricane Nate (2011)Hurricane Maria (2011)Tropical Storm Lee (2011)Hurricane Katia (2011)Hurricane IreneTropical Storm Harvey (2011)Tropical Storm Emily (2011)Tropical Storm Don (2011)Tropical Storm Bret (2011)Tropical Storm Arlene (2011)Saffir-Simpson scale

June[]

A satellite image of a large, swirling mass of clouds making landfall in Mexico
Tropical Storm Arlene after making landfall near Cabo Rojo, Veracruz, as a strong tropical storm
June 1
  • The 2011 Atlantic hurricane season officially begins.[2]
June 28
June 30
  • 1200 UTC (7:00 a.m. CDT) – Tropical Storm Arlene reaches its peak intensity with winds of 65 mph (100 km/h) and a minimum barometric pressure of 993 mbar (hPa; 29.32 inHg).[8]
  • 1300 UTC (8:00 a.m. CDT) – Tropical Storm Arlene makes landfall near Cabo Rojo, Veracruz, with winds of 65 mph (105 km/h).[8]

July[]

July 1
  • 0000 UTC (7:00 p.m. CDT June 30) – Tropical Storm Arlene weakens to a tropical depression.[8]
  • 0600 UTC (1:00 a.m. CDT) – Tropical Depression Arlene dissipates over the high terrain of Mexico.[8]
July 17
  • 1800 UTC (2:00 p.m. EDT) – Tropical Depression Two develops from an area of low pressure roughly 70 mi (115 km) north of Grand Bahama Island.[9]
July 18
  • 0000 UTC (8:00 p.m. EDT July 17) – Tropical Depression Two intensifies into Tropical Storm Bret.[9]
  • 1800 UTC (2:00 p.m. EDT) – Tropical Storm Bret reaches its peak intensity with winds of 70 mph (115 km/h) and a minimum pressure of 995 mbar (hPa; 29.38 inHg).[9]
July 20
Storm track of a tropical storm that formed east of Florida and moved northeast out to sea
Storm path of Tropical Storm Bret
  • 0600 UTC (2:00 a.m. AST) – Tropical Depression Three develops from an area of low pressure roughly 305 mi (490 km) east of Bermuda.[10]
  • 1200 UTC (8:00 a.m. AST) - Tropical Depression Three intensifies into Tropical Storm Cindy.[10]
July 21
  • 1800 UTC (2:00 p.m. AST) – Tropical Storm Cindy reaches its peak intensity with winds of 70 mph (115 km/h) and a minimum barometric pressure of 994 mbar (hPa; 29.35 inHg).[10]
July 22
  • 0000 UTC (8:00 p.m. AST July 21) – Tropical Storm Bret weakens to a tropical depression northwest of Bermuda.[9]
  • 1200 UTC (8:00 a.m. AST) – Tropical Depression Bret degenerates into a non-convective remnant area of low pressure roughly 490 mi (790 km) south-southwest of Cape Race, Newfoundland.[9]
July 23
  • 0000 UTC (8:00 p.m. AST July 22) – Tropical Storm Cindy degenerates into a non-convective remnant low roughly 855 mi (1,375 km) southwest of the coast of southwestern Ireland.[10]
July 27
  • 0600 UTC (1:00 a.m. CDT) – Tropical Depression Four develops from an area of low pressure roughly 50 mi (80 km) northeast of Cancún, Mexico.[11]
  • 1800 UTC (1:00 p.m. CDT) – Tropical Depression Four intensifies into Tropical Storm Don roughly 55 mi (90 km) north-northeast of Cancún, Mexico.[11]
July 29
  • 0000 UTC (7:00 p.m. CDT July 28) – Tropical Storm Don reaches its peak intensity with winds of 50 mph (80 km/h) and a minimum pressure of 997 mbar (hPa; 29.44 inHg) roughly 345 mi (555 km) east-southeast of Corpus Christi, Texas.[11]
July 30
  • 0230 UTC (9:30 p.m. CDT July 29) – Tropical Storm Don weakens to a tropical depression with winds of 35 mph (55 km/h) as it makes landfall along the Padre Island National Seashore just northeast of Baffin Bay, Texas.[11]
  • 0600 UTC (1:00 a.m. CDT) – Tropical Depression Don degenerates into a remnant low over southeast Texas.[11]

August[]

August 2
Satellite imagery of a disorganized tropical cyclone in the Caribbean Sea
Tropical Storm Emily crossing the Windward Islands on August 2
August 3
  • 0600 UTC (2:00 a.m. AST) – Tropical Storm Emily reaches its peak intensity with winds of 50 mph (85 km) and a minimum barometric pressure of 1003 mbar (hPa; 29.62 inHg).[12]
August 4
  • 1800 UTC (2:00 p.m. EDT) – Tropical Storm Emily degenerates into an open tropical wave south of Haiti.[12]
August 6
  • 1800 UTC (2:00 p.m. EDT) – The remnants of Tropical Storm Emily regenerate into Tropical Depression Emily.[12]
August 7
  • 0000 UTC (8:00 p.m. EDT August 6) – Tropical Depression Emily regains tropical storm status north of Grand Bahama.[12]
  • 1200 UTC (8:00 a.m. EDT) – Tropical Storm Emily degenerates into a non-convective remnant area of low pressure.[12]
August 12
  • 1800 UTC (2:00 p.m. AST) – Tropical Depression Six develops from an area of low pressure roughly 200 mi (320 km) north of Bermuda.[13]
August 13
  • 0600 UTC (2:00 a.m. AST) – Tropical Depression Six intensifies into Tropical Storm Franklin roughly 450 mi (725 km) south-southeast of Halifax, Nova Scotia.[13]
  • 1200 UTC (8:00 a.m. AST) – Tropical Storm Franklin reaches its peak intensity with maximum sustained winds of 45 mph (70 km/h) and a minimum barometric pressure of 1004 mbar (hPa; 29.65 inHg).[13]
  • 1800 UTC (2:00 p.m. AST) – Tropical Depression Seven develops from an area of low pressure roughly 370 mi (595 km) southeast of Bermuda.[14]
  • 1800 UTC (2:00 p.m. AST) – Tropical Storm Franklin transitions into an extratropical cyclone.[13]
A satellite image of a swirling mass of clouds over the open Atlantic
Tropical Storm Gert spinning over the open Atlantic
August 14
  • 0600 UTC (2:00 a.m. AST) – Tropical Depression Seven intensifies into Tropical Storm Gert.[14]
August 15
  • 1200 UTC (8:00 a.m. AST) – Tropical Storm Gert reaches its peak intensity with winds of 65 mph (105 km/h) and a minimum barometric pressure of 1000 mbar (hPa; 29.53 inHg).[14]
August 16
  • 1200 UTC (8:00 a.m. AST) – Tropical Storm Gert degenerates into a non-convective remnant area of low pressure.[14]
August 19
August 20
  • 0600 UTC (2:00 a.m. EDT) – Tropical Storm Harvey reaches its peak intensity with a minimum barometric pressure of 994 mbar (hPa; 29.35 inHg).[15]
  • 1730 UTC (12:30 p.m. CDT) – Tropical Storm Harvey reaches its peak intensity with winds of 65 mph (105 km/h) and simultaneously makes its first landfall near Dangriga, Belize.[15]
August 21
  • 0000 UTC (8:00 p.m. AST August 20) – Tropical Storm Irene develops from an area of low pressure roughly 120 mi (195 km) east of Martinique.[4]
  • 0600 UTC (1:00 a.m. CDT) – Tropical Storm Harvey weakens to a tropical depression.[15]
  • 2300 UTC (7:00 p.m. AST August 20) – Tropical Storm Irene makes its first landfall on Saint Croix with winds of 70 mph (115 km/h).[4]
A satellite image of the first hurricane of the 2011 Atlantic hurricane season
Irene shortly after being classified as a Category 1 hurricane
August 22
  • 0000 UTC (7:00 p.m. CDT August 21) – Tropical Depression Harvey regains tropical storm status in the Bay of Campeche.[15]
  • 0200 UTC (9:00 p.m. CDT August 21) – Tropical Storm Harvey makes its second and final landfall near , with winds of 40 mph (65 km/h).[15]
  • 0525 UTC (1:25 a.m. AST) – Tropical Storm Irene makes its second landfall near Punta Santiago, Puerto Rico, with winds of 70 mph (115 km/h).[4]
  • 0600 UTC (1:00 a.m. CDT) – Tropical Storm Harvey weakens to a tropical depression.[15]
  • 0600 UTC (2:00 a.m. AST) – Tropical Storm Irene intensifies into a Category 1 hurricane on the Saffir–Simpson hurricane scale, becoming the first hurricane of the 2011 season.[4]
  • 1800 UTC (1:00 p.m. CDT) – Tropical Depression Harvey dissipates roughly 85 mi (135 km) southwest of Veracruz, Mexico.[15]
August 24
  • 0600 UTC (2:00 a.m. AST) – Hurricane Irene intensifies into a Category 2 hurricane north of Haiti.[4]
  • 1200 UTC (8:00 a.m. EDT) – Hurricane Irene intensifies into a Category 3 hurricane, the first major hurricane of the 2011 season, and simultaneously reaches its peak intensity with winds of 120 mph (195 km/h).[4]
  • 1600 UTC (12:00 p.m. EDT) – Hurricane Irene makes its third landfall on the Acklins and Crooked Islands, with winds of 115 mph (185 km/h).[4]
August 25
  • 0000 UTC (8:00 p.m. EDT August 24) – Hurricane Irene weakens to a Category 2 hurricane and simultaneously makes its fourth landfall on Long Island, Bahamas, with winds of 105 mph (170 km/h).[4]
  • 0000 UTC (8:00 p.m. AST August 24) – Tropical Depression Ten develops from an area of low pressure roughly 350 mi (565 km) west-southwest of the Cape Verde Islands and simultaneously reaches its peak intensity with winds of 35 mph (55 km/h) and a minimum barometric pressure of 1006 mbar (hPa; 29.71 inHg).[16]
  • 0900 UTC (5:00 a.m. EDT) – Hurricane Irene makes its fifth landfall on Eleuthera, with winds of 100 mph (160 km/h).[4]
  • 1800 UTC (2:00 p.m. AST) – Hurricane Irene makes its sixth landfall on the Abaco Islands, with winds of 105 mph (170 km/h).[4]
August 26
  • 0600 UTC (2:00 a.m. EDT) – Hurricane Irene reaches its peak intensity with a minimum barometric pressure of 942 mbar (hPa; 27.82 inHg).[4]
  • 1800 UTC (2:00 p.m. EDT) – Hurricane Irene weakens to a Category 1 hurricane.[4]
Storm track for a short-lived tropical depression in the Eastern Atlantic
Storm track of Tropical Depression Ten
August 27
  • 0000 UTC (8:00 p.m. AST August 26) – Tropical Depression Ten degenerates into a non-convective remnant area of low pressure.[16]
  • 0600 UTC (2:00 a.m. AST) – Tropical Depression Eleven develops from an area of low pressure roughly 305 mi (490 km) south-southeast of Bermuda.[17]
  • 1200 UTC (8:00 a.m. EDT) – Hurricane Irene makes its seventh landfall near Cape Lookout, North Carolina, with winds of 85 mph (135 km/h).[4]
  • 1200 UTC (8:00 a.m. AST) – Tropical Depression Eleven intensifies into Tropical Storm Jose.[17]
August 28
  • 0935 UTC (5:35 a.m. EDT) – Hurricane Irene weakens to a tropical storm and simultaneously makes its eighth landfall on Brigantine Island, New Jersey, with winds of 70 mph (115 km/h).[4]
  • 1200 UTC (8:00 a.m. AST) – Tropical Storm Jose reaches its peak intensity with winds of 45 mph (70 km/h) and a minimum barometric pressure of 1006 mbar (hPa; 29.71 inHg).[17]
  • 1300 UTC (9:00 a.m. EDT) – Tropical Storm Irene makes its ninth and final landfall in Coney Island, Brooklyn, with winds of 65 mph (105 km/h).[4]
August 29
  • 0000 UTC (8:00 p.m. EDT August 28) – Tropical Storm Irene transitions into an extratropical cyclone near the Vermont–New Hampshire border.[4]
  • 0000 UTC (8:00 p.m. EDT August 28) – Tropical Storm Jose degenerates into a non-convective remnant area of low pressure roughly 120 mi (195 km) north-northwest of Bermuda.[17]
  • 0600 UTC (2:00 a.m. AST) – Tropical Depression Twelve develops from an area of low pressure roughly 375 mi (605 km) southwest of the Cape Verde Islands.[18]
August 30
  • 0000 UTC (8:00 p.m AST August 29) – Tropical Depression Twelve intensifies into Tropical Storm Katia roughly 425 mi (685 km) southwest of the Cape Verde Islands.[18]

September[]

September 1
  • 0000 UTC (8:00 p.m. EDT August 31) – A tropical depression develops from an area of low pressure roughly 290 mi (465 km) north of Bermuda.[19]
  • 0000 UTC (8:00 p.m. AST August 31) – Tropical Storm Katia intensifies into a Category 1 hurricane roughly 1,175 mi (1,890 km) east of the Leeward Islands.[18]
  • 1200 UTC (8:00 a.m. EDT) – The tropical depression intensifies into an unnamed tropical storm.[19]
September 2
  • 0000 UTC (7:00 p.m. CDT September 1) – Tropical Depression Thirteen develops from an area of low pressure roughly 190 mi (305 km) southwest of the mouth of the Mississippi River.[5]
  • 0600 UTC (2:00 a.m. EDT) – The unnamed tropical storm reaches its peak intensity with winds of 45 mph (70 km/h) and a minimum pressure of 1002 mbar (hPa; 29.59 inHg).[19]
  • 1200 UTC (7:00 a.m. CDT) – Tropical Depression Thirteen intensifies into Tropical Storm Lee.[5]
A satellite image depicting a subtropical cyclone prior to making landfall in Louisiana
Satellite imagery of Subtropical Storm Lee shortly before landfall
September 3
  • 0000 UTC (8:00 p.m. EDT September 2) – The unnamed tropical storm transitions into an extratropical cyclone roughly 310 mi (500 km) south-southeast of Halifax, Nova Scotia.[19]
  • 1200 UTC (7:00 a.m. CDT) – Tropical Storm Lee reaches its peak intensity with winds of 60 mph (95 km/h) and simultaneously transitions into a subtropical cyclone.[5]
September 4
  • 0600 UTC (1:00 a.m. CDT) – Subtropical Storm Lee reaches its peak intensity with a minimum barometric pressure of 986 mbar (hPa; 29.12 inHg).[5]
  • 1030 UTC (5:30 a.m. CDT) – Subtropical Storm Lee makes landfall near Intracoastal City, Louisiana, with winds of 45 mph (70 km/h).[5]
  • 1200 UTC (8:00 a.m. AST) – Hurricane Katia intensifies into a Category 2 hurricane.[18]
September 5
  • 0600 UTC (1:00 a.m. CDT) – Subtropical Storm Lee transitions into an extratropical cyclone over east-central Louisiana.[5]
  • 1200 UTC (8:00 a.m. AST) – Hurricane Katia intensifies into a Category 3 hurricane.[18]
September 6
  • 0000 UTC (8:00 p.m. AST September 5) – Hurricane Katia intensifies into a Category 4 hurricane and simultaneously reaches its peak intensity with winds of 140 mph (225 km/h) and a minimum barometric pressure of 942 mbar (hPa; 27.82 inHg).[18]
  • 1200 UTC (8:00 a.m. AST) – Hurricane Katia weakens to a Category 3 hurricane.[18]
  • 1800 UTC (2:00 p.m. AST) – Hurricane Katia weakens to a Category 2 hurricane.[18]
  • 1800 UTC (2:00 p.m. AST) – Tropical Depression Fourteen develops from an area of low pressure roughly 700 mi (1,125 km) west-southwest of the Cape Verde Islands.[20]
September 7
  • 0000 UTC (8:00 p.m. AST September 6) – Tropical Depression Fourteen intensifies into Tropical Storm Maria.[20]
  • 1200 UTC (8:00 a.m. AST) – Hurricane Katia weakens to a Category 1 hurricane.[18]
  • 1800 UTC (1:00 p.m. CDT) – Tropical Storm Nate develops from an area of low pressure roughly 140 mi (225 km) north of Villahermosa, Mexico.[21]
A satellite image depicting a Category 1 hurricane moving towards Newfoundland
Satellite imagery of Maria as a Category 1 hurricane
September 8
  • 1800 UTC (1:00 p.m. CDT) – Tropical Storm Nate intensifies into a Category 1 hurricane roughly 70 mi (115 km) north-northwest of Ciudad del Carmen.[21]
September 9
  • 0000 UTC (7:00 p.m. CDT September 8) – Hurricane Nate reaches its peak intensity with winds of 75 mph (120 km/h) and a minimum pressure of 994 mbar (hPa; 29.35 inHg).[21]
  • 0600 UTC (1:00 a.m. CDT) – Hurricane Nate weakens to a tropical storm.[21]
  • 1200 UTC (8:00 a.m. AST) – Tropical Storm Maria degenerates into a tropical disturbance.[20]
September 10
  • 1200 UTC (8:00 a.m. AST) – The remnants of Tropical Storm Maria regenerate into a tropical storm roughly 40 mi (65 km) east-southeast of Antigua.[20]
  • 1200 UTC (8:00 a.m. AST) – Hurricane Katia transitions into an extratropical cyclone roughly 250 mi (400 km) south-southeast of Cape Race, Newfoundland.[18]
September 11
  • 1600 UTC (11:00 a.m. CDT) – Tropical Storm Nate makes landfall near Tecolutla, Veracruz, with winds of 45 mph (70 km/h).[21]
September 12
  • 0000 UTC (1:00 a.m. CDT) – Tropical Storm Nate degenerates into a non-convective remnant area of low pressure roughly 20 mi (30 km) west of Poza Rica, Mexico.[21]
September 15
  • 1800 UTC (2:00 p.m. EDT) – Tropical Storm Maria intensifies into a Category 1 hurricane.[20]
September 16
  • 0600 UTC (2:00 a.m. EDT) – Hurricane Maria reaches its peak intensity with winds of 80 mph (130 km/h) and a minimum barometric pressure of 983 mbar (hPa; 29.03 inHg).[20]
  • 1800 UTC (2:00 p.m. AST) – Hurricane Maria weakens to a tropical storm.[20]
  • 1830 UTC (2:30 p.m. AST) – Tropical Storm Maria makes landfall near Cape St. Mary's, Newfoundland, with winds of 70 mph (115 km/h)[20]
  • 2100 UTC (5:00 p.m. AST) – Tropical Storm Maria dissipates over Newfoundland.[20]
September 20
  • 1800 UTC (2:00 p.m. AST) – Tropical Depression Sixteen develops from an area of low pressure roughly 1,300 mi (2,090 km) east of the Lesser Antilles.[22]
September 21
  • 0000 UTC (8:00 p.m. AST September 20) – Tropical Depression Sixteen intensifies into Tropical Storm Ophelia.[22]
September 24
  • 0600 UTC (2:00 a.m. AST) – Tropical Depression Seventeen develops from an area of low pressure roughly 225 mi (360 km) south of the Cape Verde Islands.[23]
  • 1200 UTC (8:00 a.m. AST) – Tropical Depression Seventeen intensifies into Tropical Storm Philippe.[23]
A satellite image depicting a well-developed hurricane with a clear eye visible
Hurricane Ophelia at Category 3 strength on October 1
September 25
  • 1200 UTC (8:00 a.m. AST) – Tropical Storm Ophelia degenerates into a remnant area of low pressure roughly 180 mi (290 km) east of the Leeward Islands.[22]
September 27
  • 1200 UTC (8:00 a.m. AST) – The remnants of Tropical Storm Ophelia regenerate into a tropical depression roughly 170 mi (275 km) east of the Leeward Islands.[22]
September 28
  • 0000 UTC (8:00 p.m. AST September 27) – Tropical Storm Philippe weakens to a tropical depression roughly 675 mi (1,085 km) west of the Cape Verde Islands.[23]
  • 0600 UTC (2:00 a.m. AST) – Tropical Depression Ophelia re-intensifies into a tropical storm roughly 130 mi (210 km) east of the Leeward Islands.[22]
  • 1200 UTC (8:00 a.m. AST) – Tropical Depression Philippe re-intensifies into a tropical storm.[23]
September 29
  • 1800 UTC (2:00 p.m. AST) – Tropical Storm Ophelia intensifies into a Category 1 hurricane roughly 200 mi (320 km) north of the Leeward Islands.[22]
September 30
  • 0600 UTC (2:00 a.m. AST) – Hurricane Ophelia intensifies into a Category 2 hurricane.[22]
  • 1800 UTC (2:00 p.m. AST) – Hurricane Ophelia intensifies into a Category 3 hurricane roughly midway between the Leeward Islands and Bermuda.[22]

October[]

October 2
  • 0000 UTC (8:00 p.m. AST October 1) – Hurricane Ophelia intensifies into a Category 4 hurricane and simultaneously reaches its peak intensity with winds of 140 mph (225 km/h) and a minimum barometric pressure of 940 mbar (hPa; 27.76 inHg).[22]
  • 0600 UTC (2:00 a.m. AST) – Hurricane Ophelia weakens to a Category 3 hurricane.[22]
  • 1200 UTC (8:00 a.m. AST) – Hurricane Ophelia weakens to a Category 2 hurricane.[22]
October 3
Storm track of a hurricane in the Eastern Atlantic
Storm track of Hurricane Philippe
  • 0000 UTC (8:00 p.m. AST October 2) – Hurricane Ophelia weakens to a Category 1 hurricane.[22]
  • 0600 UTC (2:00 a.m. AST) – Hurricane Ophelia weakens to a tropical storm roughly 200 mi (320 km) west-southwest of Cape Race, Newfoundland.[22]
  • 1000 UTC (6:00 a.m. AST) – Tropical Storm Ophelia transitions into an extratropical cyclone south of Newfoundland.[22]
October 4
  • 0000 UTC (8:00 p.m. AST October 3) – Tropical Storm Philippe intensifies into a Category 1 hurricane roughly 475 mi (765 km) northeast of the Leeward Islands.[23]
  • 1200 UTC (8:00 a.m. AST) – Hurricane Philippe weakens to a tropical storm.[23]
October 6
  • 0600 UTC (2:00 a.m. AST) – Tropical Storm Philippe re-intensifies into a Category 1 hurricane roughly 400 mi (645 km) south-southeast of Bermuda.[23]
October 7
  • 0000 UTC (8:00 p.m. AST October 6) – Hurricane Philippe reaches its peak intensity with winds of 90 mph (145 km/h) and a minimum barometric pressure of 976 mbar (hPa; 28.82 inHg).[23]
October 8
  • 0600 UTC (2:00 a.m. AST) – Hurricane Philippe weakens to a tropical storm.[23]
  • 1800 UTC (2:00 p.m. AST) – Tropical Storm Philippe transitions into an extratropical cyclone.[23]
October 23
  • 0600 UTC (2:00 a.m. EDT) – Tropical Depression Eighteen develops from an area of low pressure roughly 55 mi (90 km) north of Providencia Island.[24]
October 24
  • 0000 UTC (8:00 a.m. EDT) – Tropical Depression Eighteen intensifies into Tropical Storm Rina.[24]
A satellite image showing Hurricane Rina at peak intensity on October 25
Hurricane Rina at peak intensity
  • 1800 UTC (2:00 p.m. EDT) – Tropical Storm Rina intensifies into a Category 1 hurricane.[24]
October 25
  • 0600 UTC (2:00 a.m. EDT) – Hurricane Rina intensifies into a Category 2 hurricane.[24]
  • 1800 UTC (2:00 p.m. EDT) – Hurricane Rina intensifies into a Category 3 hurricane.[24]
October 26
  • 0000 UTC (7:00 p.m. CDT October 25) – Hurricane Rina reaches its peak intensity with winds of 115 mph (185 km/h) and a minimum barometric pressure of 966 mbar (hPa; 28.53 inHg).[24]
  • 1200 UTC (7:00 a.m. CDT) – Hurricane Rina weakens to a Category 2 hurricane.[24]
  • 1800 UTC (1:00 p.m. CDT) – Hurricane Rina weakens to a Category 1 hurricane.[24]
October 27
  • 1200 UTC (7:00 a.m. CDT) – Hurricane Rina weakens to a tropical storm roughly 75 mi (120 km) south-southeast of Tulum, Mexico.[24]
October 28
  • 0200 UTC (9:00 p.m. CDT) – Tropical Storm Rina makes landfall near , with winds of 60 mph (95 km/h).[24]
  • 1800 UTC (1:00 p.m. CDT) – Tropical Storm Rina degenerates into a non-convective remnant area of low pressure south of Cuba.[24]

November[]

Satellite imagery of Sean as a tropical storm
November 8
  • 0600 UTC (1:00 a.m. EST) – Subtropical Storm Sean develops from an area of low pressure roughly 445 mi (715 km) southwest of Bermuda.[25]
  • 1800 UTC (1:00 p.m. AST) – Subtropical Storm Sean transitions into a fully tropical storm.[25]
November 12
  • 0000 UTC (7:00 p.m. AST November 11) – Tropical Storm Sean transitions into an extratropical cyclone southeast of Newfoundland.[25]
November 30
  • The 2011 Atlantic hurricane season officially ends.[2]

See also[]

Notes[]

  1. ^ An average season, as defined by the National Oceanic and Atmospheric Administration, has twelve tropical storms, six hurricanes and two major hurricanes.[1]
  2. ^ Hurricanes reaching Category 3 (wind speeds of 111 miles per hour (179 km/h)) or higher on the 5-level Saffir–Simpson wind speed scale are considered major hurricanes.[3]

References[]

  1. ^ "Background Information: North Atlantic Hurricane Season". Climate Prediction Center. Retrieved September 25, 2021.
  2. ^ a b c Dorst, Neal (June 1, 2018). "Hurricane Season Information". Frequently Asked Questions About Hurricanes. Miami, Florida: NOAA Atlantic Oceanographic and Meteorological Laboratory. Retrieved June 29, 2020.
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  6. ^ "Understanding the Date/Time Stamps". Miami, Florida: NOAA National Hurricane Center. Retrieved July 10, 2020.
  7. ^ "Update on National Hurricane Center Products and Services for 2020" (PDF). Miami, Florida: National Hurricane Center. April 20, 2020. Retrieved May 17, 2020.
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  25. ^ a b c Lixion A. Avila (January 12, 2012). Tropical Cyclone Report: Tropical Storm Sean (PDF) (Report). National Hurricane Center. Retrieved July 22, 2012.

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