Tropical Storm Kay was the 15th tropical cyclone and 11th named storm of the 2004 Pacific hurricane season. Kay developed was a tropical depression on October 4 from an area of disturbed weather. Affected by persistent wind shear throughout its entire duration, Kay peaked as a weak, westward-moving tropical storm. The storm maintained a disorganized cloud pattern due to the effects of the wind shear, and it weakened to a tropical depression on October 5. On October 6, Tropical Depression Kay turned towards the southwest, and dissipated thereafter. Because Kay remained away at sea, no damages, or fatalities were reported on land.