The 2021 Pacific hurricane season was a moderately active hurricane season, with above-average tropical activity in terms of named storms, but featured below-average activity in terms of major hurricanes. It is the first season to have at least five systems make landfall in Mexico, the most since 2018. It was also the second consecutive season in which no tropical cyclones formed in the Central Pacific (between 140°W and the International Date Line). The season officially began on May 15 in the Eastern Pacific (east of 140°W longitude), and on June 1 in the Central Pacific; both ended on November 30. These dates historically describe the period each year when most tropical cyclones form in the eastern and central Pacific and are adopted by convention. However, the formation of tropical cyclones is possible at any time of the year, as illustrated this year by the formation of Tropical Storm Andres on May 9. This was the earliest forming tropical storm on record in the Eastern Pacific. The season effectively ended with the dissipation of Tropical Storm Terry, on November 10.

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) are: Central, Mountain, Pacific and Hawaii. 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

May

May 9 06:00 UTC (12:00 a.m. MDT) at Tropical Depression One-E forms from a disturbance about south-southeast of Socorro Island. 12:00 UTC (6:00 a.m. MDT) at – Tropical Depression One-E strengthens into Tropical Storm Andres, and subsequently reaches peak intensity with winds of and a central pressure of .

May 10 18:00 UTC (6:00 p.m. MDT) at – Tropical Storm Andres weakens into a tropical depression about south of the southern tip of Baja California due to strong wind shear.

May 11 06:00 UTC (12:00 a.m. MDT) at – Tropical Depression Andres transitions into a post-tropical cyclone about southwest of Socorro Island due to all thunderstorm activity disappearing.

May 15 The Eastern Pacific hurricane season officially begins.

May 30

18:00 UTC (12:00 p.m. CDT) at – Tropical Depression Two-E forms about southwest of Acapulco, Mexico from a flare up of deep convection.

May 31 12:00 UTC (6:00 a.m. MDT) at – Tropical Depression Two-E intensifies into Tropical Storm Blanca because of a widespread flare up of convection about south-southwest of Manzanillo, Mexico.

June

June 1 The Central Pacific hurricane season officially begins. 06:00 UTC (12:00 a.m. MDT) at – Tropical Storm Blanca reaches its peak intensity with maximum sustained winds of and a central pressure of .

June 2 18:00 UTC (12:00 p.m. MDT) at – Tropical Storm Blanca weakens into a tropical depression roughly south-southwest of Socorro Island.

June 4 00:00 UTC (5:00 p.m. PDT, June 3) at – Tropical Depression Blanca transitions into a post-tropical cyclone about south-southwest of the southern tip of Baja California after losing all deep convection.

June 12 12:00 UTC (5:00 a.m. PDT) at Tropical Depression Three-E forms about southwest of the southern tip of Baja California due to improved deep convection. 18:00 UTC (11:00 a.m. PDT) at Tropical Depression Three-E strengthens into Tropical Storm Carlos a mere 6 hours after becoming a tropical depression.

June 13 06:00 UTC (11:00 p.m. PDT June 12) at Tropical Storm Carlos reaches peak intensity with winds of and a minimum central pressure of

June 14 18:00 UTC (11:00 a.m. PDT) at Tropical Storm Carlos weakens into a tropical depression about west-southwest of the southern tip of the Baja California Peninsula after losing organisation.

June 16 12:00 UTC (5:00 a.m. PDT) at Tropical Depression Carlos transitions into a tropical low about west-southwest of the southern tip of the Baja California Peninsula after losing deep convection.

June 18

06:00 UTC (1:00 a.m. CDT) at Tropical Depression Four-E forms about south-southwest of Acapulco, Mexico. 12:00 UTC (7:00 a.m. CDT) at – Tropical Depression Four-E strengthens into Tropical Storm Dolores promptly after forming. June 19 12:00 UTC (7:00 a.m. CDT) at Tropical Storm Dolores reaches its peak intensity with winds of and a minimum central pressure of 15:00 UTC (10:00 a.m. CDT) at Tropical storm Dolores makes landfall near San Juan de Alima, Michoacán, Mexico with winds of about .

June 20 00:00 UTC (7:00 p.m. CDT June 19) at Tropical Storm Dolores weakens into a Tropical Depression soon after making landfall. 06:00 UTC (1:00 a.m. CDT) Tropical Depression Dolores dissipates soon after weakening into a tropical depression over central Mexico. June 25 06:00 UTC (1:00 am CDT) at Tropical Storm Enrique forms about south-southeast of Manzanillo, Mexico from a disturbance.

June 26

12:00 UTC (7:00 am CDT) at Tropical Storm Enrique strengthens into a Category 1 hurricane about south of Manzanillo, Mexico due to rapid intensification.

June 27 18:00 UTC (12:00 p.m. MDT) at Hurricane Enrique reaches peak intensity with winds of and a minimum central pressure of .

June 28 18:00 UTC (12:00 p.m. MDT) at Hurricane Enrique weakens into a tropical storm about southeast of Cabo San Lucas.

June 30 12:00 UTC (6:00 a.m. MDT) at Tropical Storm Enrique weakens into a tropical depression about northeast of La Paz, Mexico. 18:00 UTC (12:00 p.m. MDT) Tropical Depression Enrique dissipates into a trough of low pressure roughly north of La Paz, Mexico.

July

July 14

00:00 UTC (6:00 p.m. MDT July 13) at Tropical Depression Six-E forms about southwest of the southwestern coast of Mexico. 06:00 UTC (12:00 a.m. MDT) at Tropical Depression Six-E strengthens into Tropical Storm Felicia and undergoes rapid intensification.

July 15 06:00 UTC (11:00 p.m. PDT July 14) at Tropical Storm Felicia strengthens into a Category 1 hurricane about southwest of the southern tip of Baja California. 18:00 UTC (11:00 a.m. PDT) at Hurricane Felicia strengthens into a Category 2 hurricane about southwest of the southern tip of Baja California.

July 16 06:00 UTC (11:00 p.m. PDT July 15) at Hurricane Felicia strengthens into a Category 3 hurricane about southwest of the southern tip of Baja California. 18:00 UTC (8:00 a.m. HST) at Hurricane Felicia strengthens into a Category 4 hurricane about west-southwest of the southern tip of Baja California.

July 17 12:00 UTC (2:00 a.m. HST) at Hurricane Felicia reaches peak intensity with winds of and a minimum central pressure of about west-southwest of the southern tip of Baja California. 15:00 UTC (9:00 a.m. MDT) at Tropical Depression Seven-E forms about south of the southern tip of Baja California. 21:00 UTC (3:00 p.m. MDT) at Tropical Depression Seven-E strengthens into Tropical Storm Guillermo about south-southeast of the southern tip of Baja California.

July 18 18:00 UTC (8:00 a.m. HST) at Hurricane Felicia weakens into a Category 3 hurricane about west-southwest of the southern tip of Baja California. 21:00 UTC (3:00 p.m. MDT) at Tropical Storm Guillermo reaches peak intensity with winds of and a minimum central pressure of about southwest of the southern tip of Baja California.

July 19 00:00 UTC (2:00 p.m. HST July 18) at Hurricane Felicia weakens into a Category 2 hurricane about west-southwest of the southern tip of Baja California. 06:00 UTC (8:00 p.m. HST July 18) at Hurricane Felicia weakens into a Category 1 hurricane about west-southwest of the southern tip of Baja California. 18:00 UTC (8:00 a.m. HST) at Hurricane Felicia weakens into a tropical storm about east of Hilo, Hawaii. 21:00 UTC (11:00 a.m. HST) at Tropical Storm Guillermo weakens into a tropical depression about west-southwest of the southern tip of Baja California.

July 20 18:00 UTC (8:00 a.m. HST) at Tropical Strorm Felicia becomes a remnant low about east-southeast of Hilo, Hawaii. 21:00 UTC (2:00 p.m. PDT) at Tropical Depression Guillermo transitions into a post-tropical cyclone about west-southwest of the southern tip of Baja California.

July 22 18:00 UTC (8:00 a.m. HST) The remnants of Felicia dissipate.

July 30 21:00 UTC (3:00 p.m. MDT) at Tropical Storm Hilda forms about south-southewest of the southern tip of Baja California. 21:00 UTC (2:00 p.m. PDT) at Tropical Depression Nine-E forms about west-southwest of the southern tip of Baja California.

August

August 1 03:00 UTC (8:00 p.m. PDT July 31) at Tropical Storm Hilda strengthens into a category 1 hurricane about southwest of the southern tip of Baja California. 09:00 UTC (2:00 a.m. PDT) at Hurricane Hilda reaches peak intensity with winds of and a minimum central pressure of about southwest of the southern tip of Baja California. 09:00 UTC (11:00 p.m. HST July 31) at Tropical Depression Nine-E transitions into a post-tropical cyclone about west-southwest of the southern tip of Baja California. 21:00 UTC (3:00 p.m. MDT) at Tropical Depression Ten-E forms about south-southwest of the southern tip of Baja California.

August 2 15:00 UTC (9:00 a.m. MDT) at Tropical Depression Ten-E strengthens into Tropical Storm Ignacio about southwest of the southern tip of Baja California. 21:00 UTC (3:00 p.m. MDT) at Tropical Storm Ignacio reaches peak intensity with winds of and a minimum central pressure of about southwest of the southern tip of Baja California.

August 3 09:00 UTC (2:00 a.m. PDT) at Hurricane Hilda weakens into a Tropical Storm about west-southwest of the southern tip of Baja California. 09:00 UTC (2:00 a.m. PDT) at Tropical Storm Ignacio weakens into a Tropical Depression about west-southwest of the southern tip of Baja California.

August 4 03:00 UTC (8:00 p.m. PDT August 3) at Tropical Depression Ignacio transitions into a post-tropical cyclone about west-southwest of the southern tip of Baja California. 21:00 UTC (11:00 a.m. HST) at Tropical Depression Nine-E regenerates about west-southwest of the southern tip of Baja California.

August 5 09:00 UTC (11:00 p.m. HST August 4) at Tropical Depression Nine-E strengthens into Tropical Storm Jimena about west-southwest of the southern tip of Baja California. 15:00 UTC (5:00 a.m. HST) at Tropical Storm Jimena reaches peak intensity with winds of and a minimum central pressure of about west of the southern tip of Baja California. 15:00 UTC (8:00 a.m. PDT) at Tropical Storm Hilda weakens into a tropical depression about west of the southern tip of Baja California.

August 6 15:00 UTC (8:00 a.m. PDT) at Tropical Depression Hilda transitions into a post-tropical cyclone about west of the southern tip of Baja California. 21:00 UTC (11:00 a.m. HST) at Tropical Storm Jimena weakens into a tropical depression about east of Hilo, Hawaii.

August 7 03:00 UTC (5:00 p.m. HST August 6) at Tropical Depression Jimena transitions into a post-tropical cyclone about east of Hilo, Hawaii. 15:00 UTC (10:00 a.m. CDT) at Tropical Depression Eleven-E forms about south-southwest of Manzanillo, Mexico. 21:00 UTC (3:00 p.m. MDT) at Tropical Depression Eleven-E strengthens into Tropical Storm Kevin about southwest of Manzanillo, Mexico.

August 8