page_title: Timeline of the 2010 Atlantic hurricane season
section_title: September
hierarchical_section_title: Timeline of the 2010 Atlantic hurricane season / Timeline of events / September
caption_attribution_description: English: Tropical Storm Hermine inland Texas.
context_page_description: The 2010 Atlantic hurricane season was an event in the annual tropical cyclone season in the north Atlantic Ocean. It was one of the most active Atlantic hurricane seasons since record keeping began in 1851 as 19 named storms formed. The season officially began on June 1, 2010, and ended on November 30, 2010, dates that conventionally delimit the period of each year when most tropical cyclones develop in the Atlantic basin. The first storm to form was Hurricane Alex, on June 15; and the last to dissipate was Hurricane Tomas, on November 7.
  Of the year's 19 named storms, 12 strengthened into hurricanes with five intensifying further into major hurricanes. Overall, 2010 tied 1887 and 1995 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 of the season, in terms of damage and loss of life, were hurricanes Igor and Tomas. Igor was one of the largest storms by gale diameter on record, and one that attained maximum sustained winds of 155 mph before striking Newfoundland as a much weaker storm several days later.
context_section_description: September 1
  00:00 UTC (8:00 p.m. EDT, August 31) – Hurricane Earl weakens to a Category 3 hurricane.
  06:00 UTC (2:00 a.m. AST) – Tropical Depression Nine develops from an area of low pressure roughly 800 mi (1290 km) west-southwest of the Cape Verde Islands.
  12:00 UTC (8:00 a.m. AST) – Tropical Storm Fiona attains its peak intensity with a minimum barometric pressure of 998 mb (hPa; 29.47 inHg).
  12:00 UTC (8:00 a.m. AST) – Tropical Depression Nine intensifies into Tropical Storm Gaston.
  18:00 UTC (2:00 p.m. EDT) – Hurricane Earl re-intensifies into a Category 4 hurricane.
  18:00 UTC (2:00 p.m. AST) – Tropical Storm Fiona attains peak maximum sustained winds of 65 mph (100 km/h).
  18:00 UTC (2:00 p.m. AST) – Tropical Storm Gaston attains its peak intensity with maximum sustained winds of 40 mph (65 km/h) and a minimum barometric pressure of 1005 mb (hPa; 29.68 inHg).
  September 2
  06:00 UTC (2:00 a.m. EDT) – Hurricane Earl attains its peak intensity with maximum sustained winds of 145 mph (230 km/h) and a minimum barometric pressure of 927 mb (hPa; 27.37 inHg).
  18:00 UTC (2:00 p.m. EDT) – Hurricane Earl weakens to a Category 3 hurricane.
  18:00 UTC (2:00 p.m. AST) – Tropical Storm Gaston degenerates into a remnant area of low pressure roughly midway between Africa and the Lesser Antilles.
  September 3
  00:00 UTC (8:00 p.m. EDT, September 2) – Hurricane Earl weakens to a Category 2 hurricane.
  12:00 UTC (8:00 a.m. EDT) – Hurricane Earl weakens to a Category 1 hurricane.
  September 4
  00:00 UTC (8:00 p.m. EDT, September 3) – Hurricane Earl weakens to a tropical storm roughly 130 mi (210 km) south-southeast of Long Island, New York.
  00:00 UTC (8:00 p.m. AST, September 3) – Tropical Storm Fiona degenerates into a remnant area of low pressure roughly 95 mi (150 km) northeast of Bermuda.
  12:00 UTC (8:00 a.m. AST) – Tropical Storm Earl re-intensifies into a Category 1 hurricane.
  15:00 UTC (11:00 a.m. AST) – Hurricane Earl makes its first landfall near Liverpool, Nova Scotia, with winds of 75 mph (120 km/h).
  19:00 UTC (3:00 p.m. AST) – Hurricane Earl makes its second and final landfall in Prince Edward Island, and simultaneously weakens to a tropical storm, with winds of 70 mph (110 km/h).
  September 5
  00:00 UTC (8:00 p.m. AST, September 4) – Tropical Storm Earl transitions into an extratropical cyclone in the Gulf of St. Lawrence.
  18:00 UTC (1:00 p.m. CDT) – Tropical Depression Ten develops from an area of low pressure in the southern Bay of Campeche.
  September 6
  06:00 UTC (1:00 a.m. CDT) – Tropical Depression Ten intensifies into Tropical Storm Hermine.
  September 7
  02:00 UTC (9:00 p.m. CDT September 6) – Tropical Storm Hermine attains its peak intensity with maximum sustained winds of 70 mph (110 km/h) and a minimum barometric pressure of 989 mb (hPa; 29.21 inHg) and simultaneously makes landfall near Matamoros, Mexico at that intensity.
  September 8
  00:00 UTC (7:00 p.m. CDT, September 7) – Tropical Storm Hermine weakens to a tropical depression over central Texas.
  06:00 UTC (2:00 a.m. AST) – A tropical depression develops from an area of low pressure roughly 80 mi (130 km) southeast of the southernmost Cape Verde Islands.
  12:00 UTC (8:00 a.m. AST) – The tropical depression intensifies into Tropical Storm Igor.
  September 9
  12:00 UTC (8:00 a.m. AST) – Tropical Storm Igor weakens to a tropical depression.
  18:00 UTC (1:00 p.m. CDT) – Tropical Depression Hermine transitions into a post-tropical cyclone over southeastern Kansas.
  September 10
  12:00 UTC (8:00 a.m. AST) – Tropical Depression Igor re-intensifies into a tropical storm.
  September 12
  00:00 UTC (8:00 p.m. AST, September 11) – Tropical Storm Igor intensifies into a Category 1 hurricane.
  06:00 UTC (2:00 a.m. AST) – Tropical Depression Twelve develops from an area of low pressure roughly 250 mi (400 km) southeast of the southernmost Cape Verde Islands.
  12:00 UTC (8:00 a.m. AST) – Hurricane Igor intensifies into a Category 2 hurricane.
  18:00 UTC (2:00 p.m. AST) – Hurricane Igor intensifies into a Category 4 hurricane.
  18:00 UTC (2:00 p.m. AST) – Tropical Depression Twelve intensifies into 
caption: Tropical Storm Hermine shortly after landfall on September 7
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