Hurricane Marty was a tropical cyclone that produced heavy rains and flooding in several states in Southwestern and Western Mexico.

Due to favorable atmospheric conditions, Marty continued to intensify, but wind shear sharply increased as the storm approached a large mid- to upper-level trough.

A well-defined low-pressure area developed on September 26, and organized into a tropical depression by 18:00 UTC (1 p.m. CDT) the same day while situated about 335 mi (539 km) southwest of Acapulco, Guerrero.

[3] However, as Marty neared the base of the trough, westerly vertical wind shear increased rapidly, causing the low-level circulation center to be partially exposed.

[4] Despite the hostile wind shear, the cyclone reformed a central dense overcast and intensified into a hurricane by 12:00 UTC (7 a.m. CDT) on September 28, as a mid-level eye feature was seen in microwave satellite imagery.

[5] At 18:00 UTC, Marty attained its peak intensity, with maximum sustained winds of 80 mph (130 km/h) and a minimum barometric pressure of 987 mbar (987 hPa; 29.1 inHg).

[5] Turning north and northeast while under the influence of the aforementioned trough, Marty began to weaken soon after peak intensity as deep convection was displaced to the east due to the strong westerly shear; the low-level circulation center became fully exposed in a span of three hours late on September 28.

[1] Upwelling of cooler waters further decayed the deep convection,[6] prompting the NHC to downgrade Marty to a tropical storm at 06:00 UTC (1 a.m. CDT) on September 29.

[7] Continuing to steadily weaken, Marty degenerated into a post-tropical low a day later about 140 mi (230 km) west-southwest of Acapulco, while still producing gale-force winds.

The shallow system turned westward in the low-level flow and eventually opened up into a trough twelve hours later about 195 mi (314 km) west of Acapulco.