Timeline of the 2019 Pacific hurricane season

The 2019 Pacific hurricane season was an event in the annual cycle of tropical cyclone formation, in which tropical cyclones form in the eastern Pacific Ocean. The season officially started on May 15 in the eastern Pacific—east of 140°W—and June 1 in the central Pacific—between the International Date Line and 140°W, and ended on November 30. These dates conventionally delimit the period of each year when most tropical cyclones form in the eastern Pacific basin.

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.

By convention, meteorologists use one time zone when issuing forecasts and making observations: Coordinated Universal Time (UTC), and also use the 24-hour clock (where 00:00 = midnight UTC). Tropical cyclone advisories in the Eastern North Pacific basin use both UTC and the nautical time zone where the center of the tropical cyclone is currently located. Time zones utilized (east to west) are: Central, Mountain, Pacific and Hawaii. In this timeline, all information is listed by UTC first, with the respective regional time zone included in parentheses. Additionally, figures for maximum sustained winds and position estimates are rounded to the nearest 5 units (knots, 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.

May
May 15
 * The 2019 Eastern Pacific hurricane season officially begins.

June
June 1
 * The 2019 Central Pacific hurricane season officially begins.

June 25
 * 21:00 UTC (4:00 p.m. CDT) at 15.2°N, -105.7°W – Tropical Depression One-E forms about 280 mi southwest of Manzanillo, Mexico.

June 26
 * 15:00 UTC (9:00 a.m. MDT) at 14.7°N, -109.4°W – Tropical Depression One-E intensifies into Tropical Storm Alvin roughly 450 mi southwest of Manzanillo, Mexico.

June 28
 * 03:00 UTC (8:00 p.m. PDT June 27) at 17.4°N, -115.4°W – Tropical Storm Alvin strengthens into a Category 1 hurricane roughly 520 mi southwest of the southern tip of the Baja California Peninsula. Simultaneously, Alvin achieves peak intensity with 1-minute sustained winds of 75 mph and a minimum pressure of 992 mbar.
 * 09:00 UTC (2:00 a.m. PDT) at 18°N, -116.3°W – Hurricane Alvin weakens back to a tropical storm about 535 mi southwest of the southern tip of the Baja California Peninsula.

June 29
 * 09:00 UTC (2:00 a.m. PDT) at 20.3°N, -119.9°W – Tropical Storm Alvin weakens further to a tropical depression about 665 mi west-southwest of the southern tip of the Baja California Peninsula.
 * 15:00 UTC (8:00 a.m. PDT) at 20.7°N, -120.5°W – Tropical Depression Alvin degenerates into a post-tropical cyclone about 695 mi west of the southern tip of the Baja California Peninsula.

June 30
 * 15:00 UTC (9:00 a.m. MDT) at 10.6°N, -110.4°W – Tropical Storm Barbara forms from a tropical wave roughly 850 mi south of the southern tip of the Baja California Peninsula.

July
July 1
 * 21:00 UTC (2:00 p.m. PDT) at 11.5°N, -118.5°W – Tropical Storm Barbara strengthens into a Category 1 hurricane roughly 970 mi southwest of the southern tip of Baja California.

July 2 July 3 July 4 July 5 July 6 July 8 July 12 July 14 July 22 July 23 July 24 July 25 July 27 July 28 July 29 July 30 July 31
 * 03:00 UTC (8:00 p.m. PDT July 1) at 11.7°N, -119.8°W – Hurricane Barbara rapidly strengthens into a Category 2 hurricane roughly 1,010 mi southwest of the southern tip of Baja California.
 * 12:30 UTC (2:30 a.m. HST) at 12.3°N, -121.6°W – Hurricane Barbara rapidly strengthens into a Category 4 hurricane roughly 1,060 mi southwest of the southern tip of Baja California, bypassing Category 3 status entirely.
 * 03:00 UTC (5:00 p.m. HST July 2) at 13.1°N, -124.6°W – Hurricane Barbara reaches its peak intensity with sustained winds of 155 mph and a minimum pressure of 930 mbar roughly 1,175 mi southwest of the southern tip of Baja California.
 * 09:00 UTC (11:00 p.m. HST July 2) at 15.4°N, -129.2°W – Hurricane Barbara weakens into a category 3 hurricane about 1,360 mi west-southwest of the southern tip of Baja California.
 * 21:00 UTC (11:00 a.m. HST) at 16.7°N, -129.2°W – Hurricane Barbara weakens into a category 2 hurricane about 1,420 mi west-southwest of the southern tip of Baja California.
 * 09:00 UTC (11:00 p.m. HST July 4) at 17.7°N, -132.6°W – Hurricane Barbara weakens into a category 1 hurricane about 1,475 mi west-southwest of the southern tip of Baja California.
 * 15:00 UTC (5:00 a.m. HST) at 18.4°N, -133.6°W – Hurricane Barbara weakens into a tropical storm about 1,360 mi west of the southern tip of Baja California.
 * 15:00 UTC (5:00 a.m. HST) at 18.7°N, -139.2°W – Tropical Storm Barbara becomes a post-tropical cyclone about 1,040 mi east of Hilo, Hawaii.
 * 15:00 UTC (8:00 a.m. PDT) at 15.6°N, -115.7°W – Tropical Storm Cosme forms roughly 630 mi southwest of the southern tip of the Baja California Peninsula.
 * 21:00 UTC (2:00 p.m. PDT) at 16.2°N, -116.3°W – Tropical Storm Cosme reaches its peak intensity of maximum sustained winds of 50 mph and a minimum barometric pressure of 1001 mbar roughly 620 mi southwest of the southern tip of the Baja California Peninsula.
 * 03:00 UTC (8:00 p.m. PDT July 7) at 19.1°N, -119.5°W – Tropical Storm Cosme weakens to a tropical depression roughly 670 mi west-southwest of the southern tip of the Baja California Peninsula.
 * 15:00 UTC (8:00 a.m. PDT) at 20.5°N, -120.7°W – Tropical Storm Cosme degenerates into a post-tropical remnant low roughly 710 mi west of the southern tip of the Baja California Peninsula.
 * 21:00 UTC (3:00 p.m. MDT) at 15.1°N, -107.5°W – Tropical Depression Four-E forms about 340 mi southwest of Manzanillo, Mexico.
 * 15:00 UTC (8:00 a.m. PDT) at 18.4°N, -115.7°W – Tropical Depression Four-E degenerates into a remnant low about 485 mi southwest of the southern tip of the Baja California Peninsula.
 * 09:00 UTC (2:00 p.m. PDT) at 15°N, -116.2°W – Tropical Depression Five-E forms about 685 mi southwest of the southern tip of the Baja California Peninsula.
 * 09:00 UTC (2:00 a.m. PDT) at 18°N, -117.3°W – Tropical Depression Five-E strengthens into Tropical Storm Dalila about 585 mi southwest of the southern tip of the Baja California Peninsula.
 * 09:00 UTC (2:00 a.m. PDT) at 19.8°N, -118.8°W – Tropical Storm Dalila weakens into a tropical depression about 610 mi southwest of the southern tip of the Baja California Peninsula.
 * 15:00 UTC (8:00 a.m. PDT) at 21.9°N, -120.8°W – Tropical Depression Dalila degenerates into a remnant low about 700 mi west of the southern tip of the Baja California Peninsula.
 * 15:00 UTC (5:00 a.m. HST) at 11.3°N, -123.8°W – Tropical Depression Six-E forms from a tropical wave roughly 2,160 mi east of Hilo, Hawaii.
 * 21:15 UTC (2:15 p.m. PDT) at 11.6°N, -125.3°W – Tropical Depression Six-E strengthens into Tropical Storm Erick roughly 2,055 mi east of Hilo, Hawaii.
 * 15:00 UTC (9:00 a.m. MDT) at 11.2°N, -107.5°W – Tropical Depression Seven-E forms roughly 580 mi south-southwest of Manzanillo, Mexico.
 * 09:00 UTC (11:00 p.m. HST July 28) at 12.5°N, -113°W – Tropical Depression Seven-E intensifies into Tropical Storm Flossie roughly 730 mi southwest of Manzanillo, Mexico.
 * 03:00 UTC (5:00 p.m. HST July 29) at 12.7°N, -140°W – Tropical Storm Erick becomes a hurricane roughly 1,110 mi east-southeast of Hilo, Hawaii.
 * 15:00 UTC (5:00 a.m. HST) at 13.4°N, -142.8°W – Erick becomes a major hurricane roughly 920 mi east-southeast of Hilo, Hawaii.
 * 21:00 UTC (11:00 a.m. HST) at 13.6°N, -144.1°W – Erick becomes a Category 4 hurricane roughly 840 mi east-southeast of Hilo, Hawaii.
 * 21:00 UTC (11:00 a.m. HST) at 12.3°N, -121.3°W – Tropical Storm Flossie becomes a hurricane roughly 1,045 mi southwest of the southern tip of Baja California.
 * 03:00 UTC (5:00 p.m. HST July 30) at 12.8°N, -122.6°W – Flossie reaches its peak intensity with maximum sustained winds of 80 mph and a minimum barometric pressure of 989 mbar roughly 1,085 mi southwest of the southern tip of Baja California.
 * 09:00 UTC (11:00 p.m. HST July 30) at 14.2°N, -146.3°W – Hurricane Erick weakens to category 3 intensity roughly 695 mi east-southeast of Hilo, Hawaii.
 * 21:00 UTC (11:00 a.m. HST) at 14°N, -127.3°W – Hurricane Flossie weakens to a tropical storm roughly 1,295 mi west-southwest of the southern tip of Baja California.

August
August 1 August 2 August 3 August 4 August 5 August 6 August 12 August 13 August 21 August 23 August 25
 * 03:00 UTC (5:00 p.m. HST July 31) at 15.1°N, -149.6°W – Erick weakens to a category 2 hurricane roughly 480 mi southeast of Hilo, Hawaii.
 * 09:00 UTC (11:00 p.m. HST July 31) at 15.5°N, -150.9°W – Erick weakens to category 1 intensity roughly 400 mi southeast of Hilo, Hawaii.
 * 03:00 UTC (5:00 p.m. HST August 1) at 15.9°N, -154.5°W – Hurricane Erick weakens to a tropical storm roughly 265 mi south of Hilo, Hawaii.
 * 15:00 UTC (8:00 a.m. PDT) at 14.7°N, -121.2°W – Tropical Depression Eight-E forms about 930 mi southwest of the southern tip of Baja California.
 * 15:00 UTC (8:00 a.m. PDT) at 15°N, -122.4°W – Tropical Depression Eight-E strengthens into Tropical Storm Gil about 980 mi west-southwest of the southern tip of Baja California.
 * 03:00 UTC (5:00 p.m. HST August 3) at 17.9°N, -165.2°W – Tropical Storm Erick weakens into a tropical depression roughly 530 mi west-southwest of Honolulu, Hawaii.
 * 09:00 UTC (2:00 a.m. PDT) at 14.9°N, -124.4°W – Gil weakens into a tropical depression about 1,095 mi west-southwest of the southern tip of Baja California.
 * 03:00 UTC (8:00 p.m. PDT August 4) at 15.1°N, -127.3°W – Gil degenerates into a remnant low about 1,255 mi west-southwest of the southern tip of Baja California.
 * 03:00 UTC (5:00 p.m. HST August 4) at 18.9°N, -149.8°W – Tropical Storm Flossie degenerates into a tropical depression roughly 350 mi east of Hilo, Hawaii.
 * 03:00 UTC (5:00 p.m. HST August 4) at 19.2°N, -169.1°W – Tropical Depression Erick degenerates into a remnant low roughly 175 mi north of Johnston Island.
 * 03:00 UTC (5:00 p.m. HST August 5) at 20.8°N, -154.6°W – Flossie degenerates into a remnant low roughly 85 mi north-northeast of Hilo, Hawaii.
 * 03:00 UTC (9:00 p.m. MDT August 11) at 18.9°N, -109.8°W – Tropical Depression Nine-E forms from a tropical wave about 275 mi south of the southern tip of Baja California.
 * 09:00 UTC (3:00 a.m. MDT) at 19.5°N, -110.9°W – Tropical Depression Nine-E strengthens into Tropical Storm Henriette about 245 mi south-southwest of the southern tip of Baja California.
 * 09:00 UTC (2:00 a.m. PDT) at 21.1°N, -115.2°W – Henriette degenerates into a depression about 360 mi west-southwest of the southern tip of Baja California.
 * 15:00 UTC (8:00 a.m. PDT) at 21.4°N, -116.1°W – Henriette degenerates into a post-tropical remnant low about 410 mi west-southwest of the southern tip of Baja California.
 * 15:00 UTC (9:00 a.m. MDT) at 15.4°N, -107.3°W – Tropical Depression Ten-E forms from a low-pressure area roughly 545 mi south-southeast of the southern tip of Baja California.
 * 21:00 UTC (3:00 p.m. MDT) at 15.8°N, -109.5°W – Tropical Depression Ten-E strengthens into Tropical Storm Ivo roughly 490 mi south of the southern tip of Baja California.
 * 16:00 UTC (9:00 a.m. PDT) at 18.9°N, -115°W – Tropical Storm Ivo reaches its peak intensity with maximum sustained winds of 70 mph and a minimum barometric pressure of 990 mbar roughly 430 mi southwest of the southern tip of Baja California.
 * 09:00 UTC (2:00 a.m. PDT) at 24.5°N, -117°W – Tropical Storm Ivo weakens into a tropical depression roughly 460 mi west-northwest of the southern tip of Baja California.
 * 21:00 UTC (2:00 p.m. PDT) at 26°N, -117.9°W – Tropical Storm Ivo degenerates into a remnant low roughly 545 mi west-northwest of the southern tip of Baja California.

September
September 1 September 2 September 3 September 4 September 5 September 6 September 7 September 12 September 14 September 15
 * 09:00 UTC (3:00 a.m. MDT) at 13.2°N, -107.6°W – Tropical Storm Juliette forms from a tropical wave roughly 455 mi south-southwest of Manzanillo, Mexico and about 685 mi south-southeast of the southern tip of Baja California.
 * 21:00 UTC (3:00 p.m. MDT) at 17.2°N, -113.3°W – Tropical Storm Juliette becomes a Category 1 hurricane roughly 450 mi south-southwest of the southern tip of Baja California.
 * 03:00 UTC (9:00 p.m. MDT September 2) at 17.8°N, -114°W – Hurricane Juliette rapidly intensifies to Category 3 status roughly 440 mi southwest of the southern tip of Baja California.
 * 15:00 UTC (8:00 a.m. PDT) at 18.4°N, -115°W – Hurricane Juliette reaches its peak intensity with sustained winds of 125 mph and a central pressure of 953 mbar roughly 455 mi southwest of the southern tip of Baja California.
 * 09:00 UTC (2:00 a.m. PDT) at 19.1°N, -116.4°W – Hurricane Juliette weakens to Category 2 status roughly 495 mi west-southwest of the southern tip of Baja California.
 * 15:00 UTC (5:00 a.m. HST) at 13.2°N, -140.5°W – Tropical Depression Twelve-E forms roughly 1,085 mi east-southeast of South Point, Hawaii.
 * 03:00 UTC (8:00 p.m. PDT September 4) at 19.8°N, -118.5°W – Hurricane Juliette weakens to Category 1 status roughly 595 mi west-southwest of the southern tip of Baja California.
 * 23:00 UTC (1:00 p.m. HST) at 12.2°N, -144.8°W – Tropical Depression Twelve-E strengthens into Tropical Storm Akoni roughly 855 mi southeast of Hilo, Hawaii.
 * 15:00 UTC (5:00 p.m. HST) at 11.2°N, -149.7°W – Tropical Storm Akoni degenerates into a remnant low roughly 690 mi south-southeast of Hilo, Hawaii.
 * 21:00 UTC (11:00 a.m. HST) at 23.4°N, -124.9°W – Hurricane Juliette weakens to a tropical storm roughly 955 mi west of the southern tip of Baja California.
 * 21:00 UTC (11:00 a.m. HST) at 24.4°N, -129.5°W – Tropical Storm Juliette degenerates into a remnant low roughly 1,245 mi west of the southern tip of Baja California.
 * 15:00 UTC (9:00 a.m. MDT) at 15.9°N, -111.1°W – Tropical Depression Thirteen-E forms roughly 490 mi south of the southern tip of Baja California.
 * 21:00 UTC (3:00 p.m. MDT) at 16.1°N, -112.2°W – Tropical Depression Thirteen-E intensifies into Tropical Storm Kiko roughly 495 mi south-southwest of the southern tip of Baja California.
 * 21:00 UTC (2:00 p.m. PDT) at 17.1°N, -119.3°W – Tropical Storm Kiko strengthens into a Category 1 hurricane roughly 730 mi west-southwest of the southern tip of Baja California.
 * 00:30 UTC (5:30 p.m. PDT September 14) at 17°N, -117.9°W – Hurricane Kiko rapidly intensifies into a high-end Category 2 hurricane roughly 760 mi west-southwest of the southern tip of Baja California.
 * 03:00 UTC (8:00 p.m. PDT September 14) at 17°N, -120.1°W – Kiko becomes a major hurricane roughly 775 mi west-southwest of the southern tip of Baja California.

November
November 30
 * The 2019 Pacific hurricane season officially ends.