Timeline of the 2004 Pacific hurricane season

Last updated

Timeline of the
2004 Pacific hurricane season
2004 Pacific hurricane season summary map.png
Season summary map
Season boundaries
First system formedMay 22, 2004
Last system dissipatedOctober 26, 2004
Strongest system
Name Javier
Maximum winds150 mph (240 km/h)
(1-minute sustained)
Lowest pressure930 mbar (hPa; 27.46 inHg)
Longest lasting system
Name Javier
Duration9 days
Storm articles
Other years
2002, 2003, 2004, 2005, 2006

The 2004 Pacific hurricane season consisted of the events that occurred in the annual cycle of tropical cyclone formation over the Pacific Ocean north of the equator and east of the International Date Line. The official bounds of each Pacific hurricane season are dates that conventionally delineate the period each year during which tropical cyclones tend to form in the basin according to the National Hurricane Center (NHC), beginning on May 15 in the Eastern Pacific proper (east of 140°W) and June 1 in the Central Pacific (140°W to the International Date Line), and ending on November 30 in both areas. However, tropical cyclogenesis is possible at any time of year. [1] The first tropical cyclone of the season, Tropical Storm Agatha, developed on May 22; the final, Tropical Depression SixteenE, dissipated on October 26.

Contents

Activity during the 2004 season was below average. [nb 1] A total of seventeen tropical depressions formed, with twelve going on to become named tropical storms. Six storms became hurricanes, of which three further intensified into major hurricanes. [nb 2] [2] [3] Persisting throughout the season was an area of atmospheric and oceanic conditions hostile to tropical cyclones, including below-average sea surface temperatures and a stable air mass. A strong ridge over Mexico frequently steered systems toward this area, limiting their development. [3] The season's general lack of activity was reflected by an overall Accumulated Cyclone Energy index of 71.1 units, which is the seventh-lowest value on record for a Pacific hurricane season as of December 2024. [nb 3] [5]

Impacts on land were unusually light during the season, largely on account of the aforementioned ridge steering the vast majority of tropical cyclones out to sea. No systems caused any known fatalities, [3] although Hurricane Javier in September caused three fishermen to go missing off the coast of Oaxaca. [6] Javier and SixteenE made landfall as tropical depressions in northwestern Mexico, where they caused minor flooding; SixteenE also generated locally strong winds and a possible tornado. [7] [8] The remnants of both systems produced heavy rainfall in portions of the western United States. [8] [9] Hurricane Howard in early September washed out roads in western portions of the Baja California peninsula and prompted water rescues in California due to high surf. [10] [11] In mid-October, Tropical Storm Lester caused rainfall of up to 5 in (130 mm) in southern Mexico when it passed close to the coast. [12]

Prior to 2015, two time zones were utilized in the Eastern Pacific basin: Pacific east of 140°W, and Hawaii−Aleutian from 140°W to the International Date Line. [13] [14] For convenience, each event is listed in Coordinated Universal Time (UTC) first, using the 24-hour clock (where 00:00 = midnight UTC), [15] with the respective local time included in parentheses. Figures for maximum sustained winds and position estimates are rounded to the nearest five units (knots, miles, or kilometers) and averaged over one minute, 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. This timeline documents the formation of tropical cyclones as well as the strengthening, weakening, landfalls, extratropical transitions, and dissipations during the season. It also includes information that was not released while the storm was active, meaning that data from post-storm reviews by the National Hurricane Center and the Central Pacific Hurricane Center is included.

Timeline of events

Hurricane Javier (2004)Hurricane Howard (2004)Hurricane Darby (2004)Saffir–Simpson scaleTimeline of the 2004 Pacific hurricane season

May

Satellite image of Tropical Storm Agatha just before reaching peak intensity late on May 22 Agatha 2004-05-22 2050Z.jpg
Satellite image of Tropical Storm Agatha just before reaching peak intensity late on May 22

May 15

  • The 2004 Eastern Pacific hurricane season officially begins. [1]

May 22

May 23

May 24

June

June 1

  • The 2004 Central Pacific hurricane season officially begins. [1]

July

02E 2004 track.png
01C 2004 track.png
Track maps of tropical depressions TwoE (top) and OneC (bottom), which developed within 48 hours of each other in early July

July 2

July 3

July 4

July 5

July 6

July 12

Satellite image of Tropical Storm Blas just after peak intensity late on July 13 Blas 2004-07-13 2030Z (cropped).jpg
Satellite image of Tropical Storm Blas just after peak intensity late on July 13

July 13

July 14

July 15

July 19

July 22

Track map of Hurricane Celia Celia 2004 track.png
Track map of Hurricane Celia

July 24

July 26

July 27

July 28

Satellite image of a strengthening Hurricane Darby late on July 28 Darby 2004-07-28 2120Z (cropped).jpg
Satellite image of a strengthening Hurricane Darby late on July 28

July 29

July 30

July 31

August

Satellite image of Tropical Depression Six-E late on August 1 06E 2004-08-01 1935Z (cropped).jpg
Satellite image of Tropical Depression SixE late on August 1

August 1

August 2

August 19

August 20

Satellite image of a strengthening Tropical Storm Estelle late on August 20 Estelle 2004-08-20 2000Z (cropped) (cropped).jpg
Satellite image of a strengthening Tropical Storm Estelle late on August 20

August 21

August 23

Short-wave infrared satellite image of Hurricane Frank at peak intensity early on August 24 Frank 2004-08-24 0550Z (cropped).jpg
Short-wave infrared satellite image of Hurricane Frank at peak intensity early on August 24

August 24

August 25

Satellite image of Tropical Depression Nine-E late on August 25 09E 2004-08-25 2150Z (cropped).jpg
Satellite image of Tropical Depression NineE late on August 25

August 26

August 27

Track map of Tropical Storm Georgette Georgette 2004 track.png
Track map of Tropical Storm Georgette

August 30

August 31

September

September 1

Satellite image of Hurricane Howard at peak intensity on September 2 Howard 2004-09-02 1750Z (cropped).jpg
Satellite image of Hurricane Howard at peak intensity on September 2

September 2

September 3

September 4

Track map of Hurricane Howard Howard 2004 track.png
Track map of Hurricane Howard

September 5

September 8

September 10

Track map of Hurricane Isis Isis 2004 track.png
Track map of Hurricane Isis

September 11

September 12

September 13

Satellite image of Hurricane Javier just before peak intensity late on September 13 Javier 2004-09-13 2040Z (cropped).jpg
Satellite image of Hurricane Javier just before peak intensity late on September 13

September 14

September 15

September 16

Satellite image of Tropical Storm Isis late on September 15, just after weakening below hurricane strength Isis 2004-09-15 2210Z (cropped) (cropped).jpg
Satellite image of Tropical Storm Isis late on September 15, just after weakening below hurricane strength

September 17

September 18

September 19

Track map of Hurricane Javier Javier 2004 track.png
Track map of Hurricane Javier

October

October 4

October 5

Track map of Tropical Storm Kay Kay 2004 track.png
Track map of Tropical Storm Kay

October 6

October 11

Satellite image of Tropical Storm Lester shortly after being upgraded late on October 12 Lester 2004-10-12 2010Z (cropped).jpg
Satellite image of Tropical Storm Lester shortly after being upgraded late on October 12

October 12

October 13

October 25

October 26

Track map of Tropical Depression Sixteen-E 16E 2004 track.png
Track map of Tropical Depression SixteenE

November

November 30

  • The 2004 Pacific hurricane season officially ends. [1]

See also

Notes

  1. Between 1991 and 2020, an average Pacific hurricane season yielded fifteen tropical storms, eight hurricanes, and four major hurricanes. [1]
  2. A major hurricane is a Pacific or Atlantic hurricane that reaches Category 3 or higher on the five-level Saffir–Simpson scale, with maximum sustained winds of at least 111 mph (179 km/h). [1]
  3. Broadly speaking, Accumulated Cyclone Energy is the square of a tropical cyclone's wind intensity in knots at six-hour intervals, multiplied by the length of time it existed. [4]
  4. While the Central Pacific Hurricane Center's (CPHC) year-end report on tropical activity within their area of responsibility in 2004 stated that Tropical Depression OneC formed at 00:00 UTC on July 5, [2] the system's listing in the Eastern and Central Pacific hurricane database (HURDAT) begins 24 hours earlier, at 00:00 UTC on July 4. [18]
  5. The position of Darby's remnants at 12:00 UTC on August 1 is based solely on the CPHC's 2004 year-end report; [2] neither HURDAT nor the National Hurricane Center's Tropical Cyclone Report for Darby provide coordinates for where it ceased to be a tropical cyclone. [18] [21]

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