page_title: Timeline of the 2011 Atlantic hurricane season
section_title: September
hierarchical_section_title: Timeline of the 2011 Atlantic hurricane season / Timeline of events / September
caption_attribution_description: English: View of Tropical Storm Lee from the Goes-13 East NASA satellite on 3 September 2011 at 2145 UTC.
context_page_description: The 2011 Atlantic hurricane season was an event in the annual hurricane season in the north Atlantic Ocean. It was well above average in the number of tropical cyclones that formed, at 19. 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. 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. Overall, 2011 tied 1887, 1995 and 2010 for the third most-active hurricane season since record keeping began in 1851; only 1933 and 2005 were more active. The two most significant storms, in terms of loss of life and damage, were Hurricane Irene and Tropical Storm Lee.
context_section_description: 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.
  0000 UTC (8:00 p.m. AST August 31) – Tropical Storm Katia intensifies into a Category 1 hurricane roughly 1175 mi (1890 km) east of the Leeward Islands.
  1200 UTC (8:00 a.m. EDT) – The tropical depression intensifies into an unnamed tropical storm.
  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.
  0600 UTC (2:00 a.m. EDT) – The unnamed tropical storm reaches its peak intensity with winds of 45 mph (75 km/h) and a minimum pressure of 1002 mbar (hPa; 29.59 inHg).
  1200 UTC (7:00 a.m. CDT) – Tropical Depression Thirteen intensifies into Tropical Storm Lee.
  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.
  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.
  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).
  1030 UTC (5:30 a.m. CDT) – Subtropical Storm Lee makes landfall near Intracoastal City, Louisiana, with winds of 45 mph (75 km/h).
  1200 UTC (8:00 a.m. AST) – Hurricane Katia intensifies into a Category 2 hurricane.
  September 5
  0600 UTC (1:00 a.m. CDT) – Subtropical Storm Lee transitions into an extratropical cyclone over east-central Louisiana.
  1200 UTC (8:00 a.m. AST) – Hurricane Katia intensifies into a Category 3 hurricane.
  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 (220 km/h) and a minimum barometric pressure of 942 mbar (hPa; 27.82 inHg).
  1200 UTC (8:00 a.m. AST) – Hurricane Katia weakens to a Category 3 hurricane.
  1800 UTC (2:00 p.m. AST) – Hurricane Katia weakens to a Category 2 hurricane.
  1800 UTC (2:00 p.m. AST) – Tropical Depression Fourteen develops from an area of low pressure roughly 700 mi (1125 km) west-southwest of the Cape Verde Islands.
  September 7
  0000 UTC (8:00 p.m. AST September 6) – Tropical Depression Fourteen intensifies into Tropical Storm Maria.
  1200 UTC (8:00 a.m. AST) – Hurricane Katia weakens to a Category 1 hurricane.
  1800 UTC (1:00 p.m. CDT) – Tropical Storm Nate develops from an area of low pressure roughly 140 mi (220 km) north of Villahermosa, Mexico.
  September 8
  1800 UTC (1:00 p.m. CDT) – Tropical Storm Nate intensifies into a Category 1 hurricane roughly 70 mi (110 km) north-northwest of Ciudad del Carmen.
  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).
  0600 UTC (1:00 a.m. CDT) – Hurricane Nate weakens to a tropical storm.
  1200 UTC (8:00 a.m. AST) – Tropical Storm Maria degenerates into a tropical disturbance.
  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.
  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.
  September 11
  1600 UTC (11:00 a.m. CDT) – Tropical Storm Nate makes landfall near Tecolutla, Veracruz, with winds of 45 mph (75 km/h).
  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.
  September 15
  1800 UTC (2:00 p.m. EDT) – Tropical Storm Maria intensifies into a Category 1 hurricane.
  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).
  1800 UTC 
caption: Satellite imagery of Subtropical Storm Lee shortly before landfall
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