The typhoon crossed 30° north at noon on August 10 and weakened to a severe tropical storm soon afterwards, because of unfavorable sea surface temperature and expanding subsidence.

However, the Ocean Prediction Center (OPC) tracked Genevieve's remnants for another day, which crossed over the International Date Line again, until they were absorbed by another extratropical cyclone on August 15.

The National Hurricane Center (NHC) began to monitor a tropical wave associated with a few showers and thunderstorms, moving westward off the coast of northern Central America on July 17.

[7] Shortly afterward, increased wind shear took its toll on the system, causing Genevieve to lose its organization as it continued westward, under the influence of a subtropical ridge and the Intertropical Convergence Zone.

[24] By the afternoon of August 6, Genevieve intensified to a low-end Category 1 hurricane; the system also developed a central dense overcast and well-organized banding around the newly-developed eye.

[26] Genevieve crossed the International Date Line at 06:00 UTC on August 7, entering the area of responsibility of the RSMC Tokyo operated by the Japan Meteorological Agency (JMA).

[28] Only six hours later, the JTWC reported that Genevieve had reached Category 5 status with one-minute sustained winds at 160 mph (260 km/h), when a microwave imagery revealed a 69 mi (111 km) diameter eyewall with a convective band over the south quadrant.

[32] Early on August 9, Genevieve accelerated north-northeastward, and it began to encounter increasing vertical wind shear of 35 mph (56 km/h) with subsidence along the western periphery and weakening outflow into the TUTT.

The TUTT cell and the first anticyclone caused strong upper-level southwestern flow and moderate vertical wind shear over the system, but the issues were offset by the quick speed of the typhoon.

[39][40] Dry air, cool ocean temperatures and a rapid weakening of the linkage to tropical moisture made deep convection over the storm almost completely dissipate.

[41] Under the combination of many unfavorable environmental factors, the JMA downgraded the rapidly weakening system to a tropical storm, when it started to move west-northwestward and slowed down at noon.

[42] Owing to diminished convection associated with a weak low-level circulation center, the JTWC issued its final warning and downgraded Genevieve to a tropical depression late on the same day.