The 1999 Atlantic hurricane season was the annual cycle of tropical cyclone formation over the Atlantic Ocean north of the equator. The season officially began on June 1 and ended on November 30. This is historically the period during which most subtropical or tropical cyclogenesis occurs over the Atlantic Ocean. Twelve named tropical storms developed, which is near average; eight became hurricanes, of which five further intensified into major hurricanes. All five major hurricanes attained Category 4 intensity on the five-level Saffir–Simpson scale, setting a new record for the most in one season. There were also four tropical depressions that did not reach tropical storm strength. The season's first storm, Tropical Storm Arlene, formed on June 11, while its last, Hurricane Lenny, dissipated on November 23.

The most significant hurricane of the season was Hurricane Floyd, which caused devastating flooding along the East Coast of the United States. North Carolina, which had been hit only ten days earlier by Hurricane Dennis, experienced the worst impacts. Hurricane Lenny became the one of the strongest November Atlantic tropical cyclones on record, and maintained a west-to-east track through the Caribbean for nearly its entire duration. Because of its unusual path, it developed the nickname "Wrong Way Lenny." The deadliest tropical cyclone of the season was Tropical Depression Eleven, whose heavy rain and resultant flooding caused 400 deaths in Mexico.

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 1999 Atlantic hurricane season officially begins.

June 11 18:00 UTC (2:00 p.m. AST) at Tropical Depression One forms from an interaction between a tropical wave and a cold-core low about southeast of Bermuda.

June 12 12:00 UTC (8:00 a.m. AST) at Tropical Depression One strengthens into Tropical Storm Arlene about east-southeast of Bermuda.

June 13

06:00 UTC (2:00 a.m. AST) at Tropical Storm Arlene attains its peak intensity, with maximum sustained winds of and a minimum central pressure of , about east-southeast of Bermuda.The 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 operational products for each storm. All other units are rounded to the nearest digit.

June 17 00:00 UTC (8:00 p.m. AST, June 16) at Tropical Storm Arlene weakens into a tropical depression about east-southeast of Bermuda.

June 18 00:00 UTC (8:00 p.m. AST, June 17) at Tropical Depression Arlene is last noted as a tropical cyclone about northeast of Bermuda, dissipating shortly thereafter.

July July 2 18:00 UTC (1:00 p.m. CDT) at Tropical Depression Two forms from a tropical wave over the western Bay of Campeche, about east-southeast of Tuxpan, Veracruz.

July 3

00:00 UTC (7:00 p.m. CDT, July 2) at Tropical Depression Two attains its peak intensity, with maximum sustained winds of and a minimum central pressure of , about east-southeast of Tuxpan. 04:00 UTC (11:00 p.m. CDT, July 2) at Tropical Depression Two makes landfall near Tecolutla, Veracruz, or about southeast of Tuxpan, at its peak intensity. 06:00 UTC (1:00 a.m. CDT) at Tropical Depression Two is last noted as a tropical cyclone inland about south of Tuxpan, dissipating over the Sierra Madre Oriental shortly thereafter.

August August 18 18:00 UTC (1:00 p.m. CDT) at Tropical Depression Three forms from an interaction between a tropical wave and an upper-level low over the Bay of Campeche, about north of Coatzacoalcos, Veracruz.

August 19 00:00 UTC (8:00 p.m. AST, August 18) at Tropical Depression Four forms from a tropical wave about east-southeast of Cape Verde. 18:00 UTC (1:00 p.m. CDT) at Tropical Depression Three strengthens into Tropical Storm Bret about north of Coatzacoalcos.

August 20 18:00 UTC (2:00 p.m. AST) at Tropical Depression Four strengthens into Tropical Storm Cindy about west-southwest of Cape Verde.

August 21 00:00 UTC (7:00 p.m. CDT, August 20) at Tropical Storm Bret strengthens into a Category 1 hurricane on the Saffir–Simpson scale about east of Tampico, Tamaulipas. 18:00 UTC (1:00 p.m. CDT) at Hurricane Bret strengthens to Category 2 intensity about east of La Pesca, Tamaulipas.

August 22 00:00 UTC (7:00 p.m. CDT, August 21) at Hurricane Bret rapidly strengthens to Category 4 intensity about east-southeast of Brownsville, Texas. 00:00 UTC (8:00 p.m. AST, August 21) at Tropical Storm Cindy strengthens into a Category 1 hurricane about west of Cape Verde. 12:00 UTC (7:00 a.m. CDT) at Hurricane Bret attains its peak intensity, with maximum sustained winds of and a minimum central pressure of , about east-northeast of Brownsville. 18:00 UTC (2:00 p.m. AST) at Hurricane Cindy weakens into a tropical storm about west of Cape Verde.

August 23

00:00 UTC (7:00 p.m. CDT, August 22)Hurricane Bret weakens to Category 3 intensity as it makes landfall on Padre Island, Texas, with maximum sustained winds of and a central pressure of . 06:00 UTC (1:00 a.m. CDT) at Hurricane Bret rapidly weakens to Category 1 intensity inland about north-northwest of Brownsville. 12:00 UTC (7:00 a.m. CDT) at Hurricane Bret weakens into a tropical storm inland about north-northwest of Brownsville.

August 24 00:00 UTC (7:00 p.m. CDT, August 23) at Tropical Storm Bret weakens into a tropical depression inland about north of Laredo, Texas. 00:00 UTC (8:00 p.m. EDT, August 23) at Tropical Depression Five forms from a tropical wave about east of Grand Turk Island. 06:00 UTC (2:00 a.m. AST) at The sixth tropical depression of the season forms from a tropical wave about east-southeast of Barbados. 12:00 UTC (8:00 a.m. EDT) at Tropical Depression Five strengthens into Tropical Storm Dennis about northeast of Grand Turk Island. 12:00 UTC (8:00 a.m. AST) at The sixth tropical depression of the season strengthens into Tropical Storm Emily about east-southeast of Barbados. 18:00 UTC (2:00 p.m. AST) at Tropical Storm Emily attains its peak intensity, with maximum sustained winds of and a minimum central pressure of , about east-southeast of Barbados.

August 25 00:00 UTC (7:00 p.m. CDT, August 24) at Tropical Depression Bret is last noted as a tropical cyclone inland over the mountainous terrain of northern Mexico, about west of Laredo, and later dissipates.

August 26 00:00 UTC (8:00 p.m. AST, August 25) at Tropical Storm Cindy restrengthens into a Category 1 hurricane about southeast of Bermuda. 06:00 UTC (2:00 a.m. EDT) at Tropical Storm Dennis strengthens into a Category 1 hurricane about northwest of Grand Turk Island.

August 27 12:00 UTC (8:00 a.m. AST) at Hurricane Cindy strengthens to Category 2 intensity about east-southeast of Bermuda.

August 28

00:00 UTC (8:00 p.m. AST, August 27) at Hurricane Cindy strengthens to Category 3 intensity about east-southeast of Bermuda. 06:00 UTC (2:00 a.m. AST) at Hurricane Cindy strengthens to Category 4 intensity about east-southeast of Bermuda. 07:00 UTC (3:00 a.m. EDT) at Hurricane Dennis makes its first landfall over the Abaco Islands with maximum sustained winds of and a central pressure of . 12:00 UTC (8:00 a.m. AST) at Hurricane Cindy attains its peak intensity, with maximum sustained winds of and a minimum central pressure of , about east-southeast of Bermuda. 12:00 UTC (8:00 a.m. EDT) at Hurricane Dennis strengthens to Category 2 intensity about north of the Abaco Islands. 12:00 UTC (8:00 a.m. AST) at Tropical Storm Emily weakens into a tropical depression about north-northeast of Barbados, and dissipates shortly thereafter when it is absorbed by Hurricane Cindy.

August 29 12:00 UTC (8:00 a.m. AST) at Hurricane Cindy weakens to Category 3 intensity about east of Bermuda. 18:00 UTC (2:00 p.m. AST) at Hurricane Cindy weakens to Category 2 intensity about east of Bermuda.

August 30 06:00 UTC (2:00 a.m. EDT) at Hurricane Dennis attains its peak intensity, with maximum sustained winds of and a minimum central pressure of , about south of Wilmington, North Carolina. 12:00 UTC (8:00 a.m. AST) at Hurricane Cindy weakens to Category 1 intensity about east-northeast of Bermuda.

August 31

00:00 UTC (8:00 p.m. EDT, August 30) at Hurricane Dennis weakens to Category 1 intensity about east of Cape Hatteras, North Carolina. 06:00 UTC (2:00 a.m. AST) at Hurricane Cindy weakens into a tropical storm about east-northeast of Bermuda. 12:00 UTC (8:00 a.m. AST) at Tropical Storm Cindy is last noted as a tropical cyclone about west of the Azores, and is absorbed by an extratropical cyclone shortly thereafter.

September September 1 00:00 UTC (8:00 p.m. EDT, August 31) at Hurricane Dennis weakens into a tropical storm about east of Cape Hatteras.

September 4 21:00 UTC (5:00 p.m. EDT) at Tropical Storm Dennis makes its second and final landfall near Cape Lookout National Seashore in North Carolina, with maximum sustained winds of and a central pressure of .

September 5 12:00 UTC (8:00 a.m. EDT) at Tropical Storm Dennis weakens into a tropical depression inland, about north-northwest of Wilmington. 18:00 UTC (1:00 p.m. CDT) at Tropical Depression Seven forms from a monsoon-like disturbance about east-southeast of Tampico.

September 6

00:00 UTC (7:00 p.m. CDT, September 5) at Tropical Depression Seven attains its peak intensity, with maximum sustained winds of and a minimum central pressure of , about east-southeast of Tampico. 12:00 UTC (7:00 a.m. CDT) at Tropical Depresson Seven makes landfall about south of La Pesca at its peak intensity.

September 7 12:00 UTC (7:00 a.m. CDT) at Tropical Depression Seven is last noted as a tropical cyclone inland, about northwest of La Pesca, dissipating shortly thereafter. 18:00 UTC (2:00 p.m. EDT) at Tropical Depression Dennis transitions into an extratropical cyclone inland, about north-northwest of Williamsport, Pennsylvania, and later dissipates. 18:00 UTC (1:00 p.m. AST) at Tropical Depression Eight forms from a tropical wave about east of Barbados.

September 8 06:00 UTC (2:00 a.m. AST) at Tropical Depression Eight strengthens into Tropical Storm Floyd about east of Barbados.

September 10 12:00 UTC (8:00 a.m. AST) at Tropical Storm Floyd strengthens into a Category 1 hurricane about east-northeast of Barbuda.

September 11 06:00 UTC (2:00 a.m. AST) at Hurricane Floyd strengthens to Category 2 intensity about north of Barbuda. 12:00 UTC (8:00 a.m. AST) at Tropical Depression Nine forms from a tropical wave about south of Cape Verde.

September 12 12:00 UTC (8:00 a.m. EDT) at Hurricane Floyd strengthens to Category 3 intensity about north of San Juan, Puerto Rico. 12:00 UTC (8:00 a.m. AST) at Tropical Depression Nine strengthens into Tropical Storm Gert about west of Cape Verde. 18:00 UTC (2:00 p.m. EDT) at Hurricane Floyd strengthens to Category 4 intensity about east-northeast of Grand Turk Island.

September 13