Hurricane Genevieve was a strong tropical cyclone that almost made landfall on the Baja California Peninsula in August 2020. Genevieve was the twelfth tropical cyclone, eighth named storm, third hurricane, and second major hurricane of the 2020 Pacific hurricane season. The cyclone formed from a tropical wave that the National Hurricane Center (NHC) first started monitoring on August 10. The wave merged with a trough of low pressure on August 13, and favorable conditions allowed the wave to intensify into Tropical Depression Twelve-E at 15:00 UTC. Just six hours later, the depression became a tropical storm and was given the name Genevieve. Genevieve quickly became a hurricane by August 17, and Genevieve began explosive intensification the next day. By 12:00 UTC on August 18, Genevieve reached its peak intensity as a Category 4 hurricane, with maximum 1-minute sustained winds of 130 mph and a minimum central pressure of . Genevieve began to weaken on the next day, possibly due to cooler waters caused by Hurricane Elida earlier that month. Genevieve weakened below tropical storm status around 18:00 UTC on August 20, as it passed close to Baja California Sur. Soon afterward, Genevieve began to lose its deep convection and became a post-tropical cyclone by 21:00 UTC on August 21, eventually dissipating off the coast of Southern California late on August 24.
Hurricane-force gusts affected parts of Baja California as Genevieve passed close by. Several inches of rain caused flooding near Cabo San Lucas on August 20. A total of six deaths were attributed to Genevieve across Mexico. Total economic losses associated with Genevieve reached US$50 million in Mexico.
Meteorological history
On August 10, the NHC noted the possibility of an area of low pressure forming near Central America within the next few days. On August 13, a tropical wave entered the Eastern Pacific basin from Central America. Later that day, the NHC's forecast was realized, as a trough of low pressure developed just offshore Central America, in association with the tropical wave. The disturbance gradually organized, and on August 16, the system became a tropical depression, receiving the designation Twelve-E at 15:00 UTC. The depression rapidly strengthened and became a tropical storm 6 hours later at 21:00 UTC, receiving the name Genevieve. Genevieve continued to strengthen rapidly overnight as it developed an inner core, and the storm became a Category 1 hurricane on August 17, reaching 1-minute sustained winds of . Genevieve continued to rapidly intensify as it began to grow an eye along with well-defined banding features, later that day. By 03:00 UTC the next day, Genevieve had intensified into a Category 2 hurricane, as strong outflow became evident and the eye began to grow, though it remained clouded. Just 6 hours later, Genevieve became a Category 3 hurricane, as an eyewall and a well-defined eye became visible.
Three hours later, at 12:00 UTC on August 18, Genevieve intensified further into a Category 4 hurricane, and the storm reached its peak intensity, with maximum 1-minute sustained winds of and a minimum central pressure of . Later that day, as Genevieve maintained its intensity, imagery showed an almost-circular eye, along with a well-defined inner core. On the next day, Genevieve began to weaken, with no signs of an eyewall replacement cycle, hinting at weakening possibly due to a cold wake left behind by Hurricane Elida, earlier that month. Genevieve continued a gradual weakening trend for the next several hours, but later that day, data from an NHC Reconnaissance Flight indicated that Genevieve was rapidly weakening, with the storm dropping to Category 1 status by 21:00 UTC that day. On August 20, Genevieve turned northwestward and passed very close to Cabo San Lucas, at the southern tip of the Baja California Peninsula, and the system weakened further into a tropical storm at 18:00 UTC. By 21:00 UTC on August 21, Genevieve had degenerated into a post-tropical cyclone, after having no deep convection near its center for 12 hours. At 12:00 UTC on August 22, Genevieve's remnant low dissipated. However, Genevieve's remnant circulation continued to persist for another couple of days, stalling off the coast of Southern California on August 23. Genevieve's remnants dissipated by 00:00 UTC on August 25.