The final named storm of the season originated from a tropical disturbance that crossed Nicaragua into the eastern Pacific Ocean.

Quickly intensifying, the depression attained tropical storm status early on October 16; it was given the name Roslyn by the Eastern Pacific Hurricane Center.

An eye became visible on satellite imagery, and by October 17 the storm reached hurricane status, while located about 400 miles (640 km) south of Acapulco, Guerrero.

Roslyn maintained peak intensity for about 18 hours, during which it turned more to the northwest in response to a powerful advancing cold front.

After bypassing southeast of the Baja California Peninsula, Hurricane Roslyn moved ashore on October 22 at Mazatlán, Sinaloa with winds of 75 mph (120 km/h).

[2] Prior to the hurricane's landfall in Mexico, officials in Mazatlán executed the evacuation of over 2,000 people in vulnerable coastal areas; such preparations prevented any deaths or injuries.

[2] The outskirts of the remnants of Roslyn brought rainfall to areas still recovering from significant flooding, partially caused by the earlier Hurricane Paine.