Timeline of the 2004 Atlantic hurricane season

The 2004 Atlantic hurricane season was notable as one of the deadliest and most costly Atlantic hurricane seasons on record. It officially began on June 1, 2004 and ended on November 30. This timeline documents tropical cyclone formations, strengthening, weakening, landfalls, extratropical transitions, as well as dissipations. The timeline includes information which was not operationally released, meaning that information from post-storm reviews by the National Hurricane Center, such as information on a storm that was not operationally warned upon, has been included.

This season had 26 tropical depressions, 24 named storms, 16 hurricanes, and 10 major hurricanes, i.e. those that rank as Category 3 or higher on the Saffir-Simpson Hurricane Scale.

June

 * June 1
 * The Atlantic hurricane season officially begins.


 * June 25
 * 0600 UTC - Tropical Depression One develops.
 * 1200 UTC - Tropical Depression One strengthens into Tropical Storm Alex.


 * June 26
 * 0000 UTC - Alex attains peak intensity, reaching winds of 70 mph and a central pressure of 990 mb.


 * June 27
 * 1200 UTC - Tropical Storm Alex weakens into a tropical depression.
 * 1800 UTC - Tropical Depression Alex dissipates.

July

 * July 6
 * 1800 UTC - Tropical Depression Two develops.


 * July 7
 * 1200 UTC - Tropical Depression Two strengthens into Tropical Storm Bonnie.


 * July 10
 * 0000 UTC - Tropical Storm Bonnie strengthens into a Category 1 hurricane.


 * July 12
 * 0000 UTC - Hurricane Bonnie strengthens into a Category 2 hurricane.


 * July 13
 * 1200 UTC - Hurricane Bonnie strengthens into a Category 3 major hurricane.


 * July 14
 * 0600 UTC - Hurricane Bonnie strengthens into a Category 4 major hurricane.
 * 1200 UTC - Hurricane Bonnie attains peak intensity, with winds reaching 145 mph and a central pressure of 944 mb.
 * 1800 UTC - Tropical Depression Three develops.


 * July 15
 * 0000 UTC - Tropical Depression Three develops into Tropical Storm Charley and simultaneously attains peak intensity with winds of 40 mph and a central pressure of 1004 mb.
 * 1800 UTC - Tropical Storm Charley weakens into a tropical depression


 * July 16
 * 0000 UTC - Tropical Depression Charley weakens into a remnant low.
 * 0600 UTC - Hurricane Bonnie weakens into a Category 3 hurricane.
 * 1800 UTC - Hurricane Bonnie restrengthens into a Category 4 hurricane.


 * July 17
 * 0000 UTC - Hurricane Bonnie weakens back into a Category 3 hurricane.


 * July 19
 * 1800 UTC - Hurricane Bonnie weakens into a Category 2 hurricane.


 * July 20
 * 1200 UTC - Hurricane Bonnie restrengthens into a Category 3 hurricane.


 * July 21
 * 1800 UTC - Hurricane Bonnie weakens back into a Category 2 hurricane
 * 2310 UTC - Hurricane Bonnie makes landfall near Ocean Isle Beach, North Carolina with winds of 105 mph.


 * July 22
 * 0600 UTC - Hurricane Bonnie weakens into a Category 1 hurricane.
 * 1200 UTC - Hurricane Bonnie weakens into a tropical storm.


 * July 23
 * 0000 UTC - Tropical Storm Bonnie dissipates overland.


 * July 25
 * 1800 UTC - Tropical Depression Four develops.


 * July 27
 * 0000 UTC - Tropical Depression Four strengthens into Tropical Storm Danielle.


 * July 28
 * 0000 UTC - Tropical Storm Danielle weakens into a remnant low.


 * July 29
 * 1200 UTC - Tropical Depression Five develops.
 * 1800 UTC - Tropical Depression Five strengthens into Tropical Storm Earl.


 * July 30
 * 1800 UTC - Tropical Storm Earl strengthens into a Category 1 hurricane.


 * July 31
 * 1200 UTC - Remnant low Danielle strengthens into Tropical Storm Danielle once again.

August

 * August 1
 * 0600 UTC - Tropical Storm Danielle strengthens into a Category 1 hurricane.
 * 1200 UTC - Hurricane Earl attains peak intensity with winds reaching 100 mph and a central pressure of 957 mb.
 * 1800 UTC - Hurricane Danielle strengthens into a Category 2 hurricane.


 * August 2
 * 0000 UTC - Hurricane Danielle strengthens into a Category 3 hurricane.


 * August 3
 * 0600 UTC - Hurricane Danielle weakens back into a Category 2 hurricane.


 * August 4
 * 0000 UTC - Hurricane Earl becomes a post-tropical cyclone.
 * 0600 UTC - Hurricane Danielle strengthens back into a Category 3 hurricane.
 * 1800 UTC - Hurricane Danielle strengthens into a Category 4 hurricane.


 * August 5
 * 0600 UTC - Hurricane Danielle attains peak intensity, with winds reaching 150 mph and a central pressure of 937 mb.


 * August 6
 * 0600 UTC - Hurricane Danielle weakens into a Category 3 hurricane.


 * August 7
 * 0000 UTC - Hurricane Danielle strengthens back into a Category 4 hurricane.


 * August 8
 * 0600 UTC - Hurricane Danielle makes landfall near Felipe Carillo Puerto, Mexico with winds of 140 mph.
 * 1200 UTC - Hurricane Danielle weakens into a Category 2 hurricane.
 * 1800 UTC - Hurricane Danielle weakens into a tropical storm.


 * August 10
 * 0600 UTC - Tropical Storm Danielle strengthens into a Category 1 hurricane.


 * August 11
 * 0000 UTC - Hurricane Danielle weakens into a tropical storm.
 * 1200 UTC - Tropical Storm Danielle weakens into a tropical depression.
 * 1800 UTC - Tropical Depression Danielle dissipates.


 * August 12
 * 1800 UTC - Tropical Depression Six develops.


 * August 13
 * 0000 UTC - Tropical Depression Six strengthens into Tropical Storm Frances.


 * August 15
 * 0000 UTC - Tropical Storm Frances attains peak intensity, with winds reaching 70 mph and a central pressure of 990 mb.


 * August 16
 * 1200 UTC - Tropical Storm Frances weakens into a tropical depression.


 * August 17
 * 0000 UTC - Tropical Depression Frances dissipates.