Irving turned sharply to the west and rapidly weakened, dissipating over the Korea Strait at noon on August 5.

[nb 1][nb 2] The final tropical cyclone to develop during July 1992, Tropical Storm Irving originated from a distinct but weak low-pressure area embedded in the Western Pacific monsoon trough that extended from the South China Sea to the central Philippine Sea.

[1] A hurricane hunter aircraft investigated the system and discovered that the low-level circulation was 220 km (135 mi) further north than what was inferred from the satellite data.

[5] Meanwhile, the JTWC upgraded the depression into Tropical Storm Irving,[6] based on an increase in atmospheric convection near the center and Dvorak satellite estimates.

[6] At the same time, the JMA estimated that Irving attained its peak intensity of 105 km/h (65 mph) and a barometric pressure of 980 mbar (28.94 inHg).

[2] According to the JTWC, Irving continued to intensify in contrast to forecasts and attained a peak intensity of 145 km/h (90 mph) at 00:00 UTC on August 4, in agreement with surface observations.

At the time of peak intensity, visible satellite imagery showed an elliptic eye 185 km (115 mi) in diameter.

Upon making landfall over southwestern Shikoku at peak intensity,[6] Irving turned sharply to the west and rapidly weakened.

[2] Tropical Storm Irving was the first of two successive systems to move over the Japanese archipelago,[1] with Typhoon Jannis succeeding it.

[17] Roads were damaged in 17 spots in Wakayama prefecture,[18] where two people were reported missing due to rough seas.