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 25; 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. 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 (250 km/h) before striking Newfoundland as a much weaker storm several days later. Tomas was a late-season tropical cyclone that rapidly intensified to reach maximum sustained winds of 100 mph (160 km/h) as it entered the eastern Caribbean Sea. Though the system did not make landfall, it severely affected the Greater Antilles, and impacted the southeastern Bahamas as a tropical storm before quickly moving into the open Atlantic.

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

The time stamp for each event is first stated using Coordinated Universal Time (UTC), the 24-hour clock where 00:00 = midnight UTC. The NHC 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. In this timeline, the respective area time is included in parentheses. Additionally, figures for maximum sustained winds and position estimates are rounded to the nearest 5 units (miles, or kilometers), following National Hurricane Center practice. 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. __TOC__

Timeline

June June 1 The 2010 Atlantic hurricane season officially begins. June 25 18:00 UTC (2:00 p.m. EDT) – Tropical Depression One develops from an area of low pressure roughly 80 mi (130 km) north-northeast of Puerto Lempira.

June 26 06:00 UTC (2:00 a.m. EDT) – Tropical Depression One intensifies into Tropical Storm Alex. June 27 00:00 UTC (7:00 p.m. CDT, June 26) – Tropical Storm Alex makes its first landfall near Belize City with winds of 65 mph (100 km/h). June 30 00:00 UTC (7:00 p.m. CDT, June 29) – Tropical Storm Alex intensifies into a Category 1 hurricane on the Saffir–Simpson hurricane wind scale, becoming the first of the 2010 season.

July July 1 00:00 UTC (7:00 p.m. CDT June 30) – Hurricane Alex intensifies into a Category 2 hurricane. 02:00 UTC (9:00 p.m. CDT June 30) – Hurricane Alex attains its peak intensity with maximum sustained winds of 110 mph (175 km/h) and a minimum barometric pressure of 946 mb (hPa; 27.94 inHg), and simultaneously makes a second and final landfall near Soto la Marina. 06:00 UTC (1:00 a.m. CDT) – Hurricane Alex weakens to a Category 1 hurricane. 12:00 UTC (7:00 a.m. CDT) – Hurricane Alex weakens to a tropical storm. July 2 00:00 UTC (7:00 p.m. CDT, July 1) – Tropical Storm Alex weakens to a tropical depression. 06:00 UTC (1:00 a.m. CDT) – Tropical Depression Alex dissipates over the high terrain of central Mexico. July 8 00:00 UTC (7:00 p.m. CDT, July 7) – Tropical Depression Two develops from an area of low pressure roughly 250 mi (400 km) southeast of Brownsville, Texas, and simultaneously attains its peak intensity with maximum sustained winds of 35 mph (55 km/h) and a minimum barometric pressure of 1005 mb (hPa; 29.68 inHg). 14:00 UTC (9:00 a.m. CDT) – Tropical Depression Two makes landfall on South Padre Island, Texas, with winds of 35 mph (55 km/h). July 9 06:00 UTC (1:00 a.m. CDT) – Tropical Depression Two degenerates into a non-convective remnant area of low pressure over northern Mexico.

July 22 06:00 UTC (2:00 a.m. EDT) – Tropical Depression Three develops from an area of low pressure south of Acklins Island. 23:15 UTC (7:15 p.m. EDT) – Tropical Depression Three intensifies into Tropical Storm Bonnie and simultaneously makes its first landfall on Ragged Island, Bahamas, with winds of 40 mph (65 km/h). July 23 05:15 UTC (1:15 a.m. EDT) – Tropical Storm Bonnie makes its second landfall on Andros Island with winds of 45 mph (75 km/h). 06:00 UTC (2:00 a.m. EDT) – Tropical Storm Bonnie attains its peak intensity with a minimum barometric pressure of 1005 mb (29.68 inHg). 14:30 UTC (10:30 a.m. EDT) – Tropical Storm Bonnie makes its third and final landfall near Elliott Key with winds of 40 mph (65 km/h). 18:00 UTC (2:00 p.m. EDT) – Tropical Storm Bonnie weakens to a tropical depression. July 25 00:00 UTC (7:00 p.m. CDT, July 24) – Tropical Depression Bonnie degenerates into a non-convective remnant area of low pressure roughly 60 mi (95 km) southeast of the mouth of the Mississippi River.

August

August 2 12:00 UTC (8:00 a.m. AST) – Tropical Depression Four develops from an area of low pressure in the central Atlantic. August 3 06:00 UTC (2:00 a.m. AST) – Tropical Depression Four intensifies into Tropical Storm Colin roughly 840 mi (1350 km) east of the Lesser Antilles. 18:00 UTC (2:00 p.m. AST) – Tropical Storm Colin degenerates into a trough of low pressure. August 5 12:00 UTC (8:00 a.m. AST) – The remnants of Tropical Storm Colin regenerate into a tropical storm roughly 280 mi (450 km) north-northeast of San Juan, Puerto Rico. 21:00 UTC (5:00 p.m. AST) – Tropical Storm Colin attains its peak intensity with maximum sustained winds of 60 mph (95 km/h) and a minimum barometric pressure of 1005 mb (hPa; 29.68 inHg). August 8 00:00 UTC (8:00 p.m. AST, August 7) – Tropical Storm Colin weakens to a tropical depression roughly 170 mi (275 km) south-southwest of Bermuda. 12:00 UTC (8:00 a.m. AST) – Tropical Depression Colin dissipates roughly 100 mi (160 km) southwest of Bermuda. August 10 18:00 UTC (1:00 p.m. CDT) – Tropical Depression Five develops from an area of low pressure roughly 105 mi (165 km) west of Naples, Florida. August 11 00:00 UTC (7:00 p.m. CDT, August 10) – Tropical Depression Five attains its peak intensity with maximum sustained winds of 35 mph (55 km/h) and a minimum barometric pressure of 1007 mb (hPa; 29.74 inHg). 06:00 UTC (2:00 a.m. CDT) – Tropical Depression Five degenerates into a remnant area of low pressure roughly 125 mi (200 km) west of Naples, Florida.

August 21 18:00 UTC (2:00 p.m. AST) – Tropical Depression Six develops from an area of low pressure roughly 450 mi (720 km) west-southwest of the Cape Verde Islands. August 22 06:00 UTC (2:00 a.m. AST) – Tropical Depression Six intensifies into Tropical Storm Danielle. August 23 18:00 UTC (2:00 p.m. AST) – Tropical Storm Danielle intensifies into a Category 1 hurricane roughly 960 mi (1545 km) west of the southernmost Cape Verde Islands. August 25 06:00 UTC (2:00 a.m. AST) – Tropical Depression Seven develops from an area of low pressure roughly 200 mi (320 km) west-southwest of the Cape Verde Islands. 12:00 UTC (8:00 a.m. AST) – Tropical Depression Seven intensifies into Tropical Storm Earl. August 26 06:00 UTC (2:00 a.m. AST) – Hurricane Danielle intensifies into a Category 2 hurricane. August 27 06:00 UTC (2:00 a.m. AST) – Hurricane Danielle intensifies into a Category 3 hurricane, the first major hurricane of the season. 18:00 UTC (2:00 p.m. AST) – Hurricane Danielle intensifies into a Category 4 hurricane and simultaneously attains its peak intensity with maximum sustained winds of 135 mph (215 km/h) and a minimum barometric pressure of 942 mb (hPa; 27.82 inHg).

August 28 00:00 UTC (8:00 p.m. AST, August 27) – Hurricane Danielle weakens to a Category 3 hurricane. 06:00 UTC (2:00 a.m. AST) – Hurricane Danielle weakens to a Category 2 hurricane. August 29 06:00 UTC (2:00 a.m. AST) – Hurricane Danielle weakens to a Category 1 hurricane. 12:00 UTC (8:00 a.m. AST) – Tropical Storm Earl intensifies into a Category 1 hurricane roughly 220 mi (355 km) east of the northern Leeward Islands. August 30 00:00 UTC (8:00 p.m. AST, August 29) – Hurricane Earl intensifies into a Category 2 hurricane. 12:00 UTC (8:00 a.m. EDT) – Hurricane Earl intensifies into a Category 3 hurricane. 12:00 UTC (8:00 a.m. AST) – A tropical depression develops from an area of low pressure roughly 900 mi (1450 km) east of the Lesser Antilles. 18:00 UTC (2:00 p.m. AST) – Hurricane Danielle weakens to a tropical storm. 18:00 UTC (2:00 p.m. EDT) – Hurricane Earl intensifies into a Category 4 hurricane. 18:00 UTC (2:00 p.m. AST) – The tropical depression intensifies into Tropical Storm Fiona. August 31 00:00 UTC (8:00 p.m. AST, August 30) – Tropical Storm Danielle degenerates into a remnant area of low pressure well northeast of the Azores.

September 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