Moving north-northwest, Percy slowly deepened and obtained its peak intensity of 115 km/h (70 mph) and a minimum barometric pressure of 975 mbar (28.79 inHg).

[nb 1][nb 2] Tropical Storm Percy originated from an area of persistent convection over the Philippine Sea, which separated from a large area of deep convection associated with converging monsoonal flow into Tropical Storm Ofelia, that was first noted by the Joint Typhoon Warning Center (JTWC) on July 26.

[5] At 18:00 UTC on July 27, the JTWC followed suit and declared the system a tropical depression,[6] following an increase in organization.

[7] Based on ship reports,[1] the JTWC and the JMA each upgraded the cyclone to Tropical Storm Percy on the morning of July 28.

[6] Following two previous tropical cyclones to the northwest, Percy tracked generally north-northwest[7] while slowly strengthening.

[1] Meanwhile, the JMA estimated that Percy attained its peak wind speed of 115 km/h (70 mph) and a minimum barometric pressure of 975 mbar (28.79 inHg).

[7] On July 30, the JMA downgraded Percy to a tropical depression,[2] and several hours later, the JTWC issued its final advisory on the system, as it had dissipated over the Sea of Japan.

[2] The cyclone, along with Tropical Storms Nathan and Percy before it, dropped heavy rainfall across southern portions of the Japanese archipelago across late July and early August 1993.

[22] Heavy rains from Ofelia, Percy, and Nathan caused Nagasaki City to have their wettest July on record.

[23] In Nage City in Kagoshima prefecture, strong winds partially destroyed one house and injured an individual.