In early July, a circulation with an area of convection developed along the monsoon trough near Enewetak Atoll.
The system remained nearly stationary, tracking slowly to the southwest.
Gradually organizing, the system developed into a tropical depression on July 6 over the Marshall Islands.
Without having issued a tropical cyclone formation alert, the Joint Typhoon Warning Center (JTWC) initiated advisories on Tropical Depression 10W at 0000 UTC on July 7.
Late that day, the Japan Meteorological Agency (JMA)  upgraded the depression to Tropical Storm Halong near the island of Chuuk in the Federated States of Micronesia.
By that time, the storm was moving west-northwestward, steered by a ridge to the north.
Halong slowly intensified, although it continued to develop deep convection that wrapped into the center.
Early on July 9, the JMA upgraded the storm to a severe tropical storm.
At 1200 UTC that day, the JTWC upgraded Halong to typhoon status about 405 km (250 mi) east-southeast of Guam.

While moving toward Guam, Halong became better organized, developing an eye and well-defined rainbands.
After a brief turn more toward the west, the storm passed about 140 km (85 mi) south of the southern tip of Guam at 0200 UTC on July 10; at the time, the JTWC estimated 1‑minute sustained winds of 165 km/h (105 mph), although the JMA had maintained Halong as a tropical storm until upgrading to a typhoon at 1800 UTC that day.
An approaching trough increased shear over Halong, and a weak ridge to the north restricted outflow; this briefly prevented significant intensification after the convection decreased.
Late on July 11, the thunderstorms increased, and restrengthening resumed.
Late on July 12, the JMA assessed Halong as reaching peak 10‑minute sustained winds of 155 km/h (100 mph).
Around that time, the typhoon entered the area of the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA), which gave it the local name Typhoon Inday.
Early on July 13, the JTWC upgraded Halong to a super typhoon after the storm developed a well-defined eye 63 km (39 mi) in diameter.
Shortly thereafter, the agency estimated peak 1‑minute sustained winds of 250 km/h (155 mph).

At its peak intensity, Typhoon Halong had gale-force winds that extended 415 km (260 mi) northeast of the center.
It was continuing to the northwest toward Okinawa, and threatened to strike the island at near peak intensity.
However, the typhoon began rapidly weakening due to increasing wind shear, and the eye quickly deteriorated.
At around 1200 UTC on July 14, Halong made landfall on Okinawa with 10‑minute winds of 130 km/h (80 mph).
Around that time, the typhoon moved through a weakness in the ridge, turning to the north and later accelerating to the northeast.
The combination of cool, dry air, and the persistent wind shear removed the convection from the center by early on July 15, weakening Halong to tropical storm status.
Later that day, the JTWC discontinued advisories while the storm was approaching Japan, and the agency classified Halong as extratropical.
The JMA continued tracking the storm, and Halong struck both the Izu and Bōsō peninsulas along Honshu.
Late on July 16, the JMA classified Halong as extratropical, and shortly thereafter the storm dissipated over the Kuril Islands.
The extratropical remnants of Halong moved out of the basin late on July 19, just prior dissipating.
In early July, a circulation with an area of convection developed along the monsoon trough near Enewetak Atoll. The system remained nearly stationary, tracking slowly to the southwest. Gradually organizing, the system developed into a tropical depression on July 6 over the Marshall Islands. Without having issued a tropical cyclone formation alert, the Joint Typhoon Warning Center (JTWC) initiated advisories on Tropical Depression 10W at 0000 UTC on July 7. Late that day, the Japan Meteorological Agency (JMA)  upgraded the depression to Tropical Storm Halong near the island of Chuuk in the Federated States of Micronesia. By that time, the storm was moving west-northwestward, steered by a ridge to the north. Halong slowly intensified, although it continued to develop deep convection that wrapped into the center. Early on July 9, the JMA upgraded the storm to a severe tropical storm. At 1200 UTC that day, the JTWC upgraded Halong to typhoon status about 405 km (250 mi) east-southeast of Guam.
While moving toward Guam, Halong became better organized, developing an eye and well-defined rainbands. After a brief turn more toward the west, the storm passed about 140 km (85 mi) south of the southern tip of Guam at 0200 UTC on July 10; at the time, the JTWC estimated 1‑minute sustained winds of 165 km/h (105 mph), although the JMA had maintained Halong as a tropical storm until upgrading to a typhoon at 1800 UTC that day. An approaching trough increased shear over Halong, and a weak ridge to the north restricted outflow; this briefly prevented significant intensification after the convection decreased. Late on July 11, the thunderstorms increased, and restrengthening resumed. Late on July 12, the JMA assessed Halong as reaching peak 10‑minute sustained winds of 155 km/h (100 mph). Around that time, the typhoon entered the area of the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA), which gave it the local name Typhoon Inday. Early on July 13, the JTWC upgraded Halong to a super typhoon after the storm developed a well-defined eye 63 km (39 mi) in diameter. Shortly thereafter, the agency estimated peak 1‑minute sustained winds of 250 km/h (155 mph).
At its peak intensity, Typhoon Halong had gale-force winds that extended 415 km (260 mi) northeast of the center. It was continuing to the northwest toward Okinawa, and threatened to strike the island at near peak intensity. However, the typhoon began rapidly weakening due to increasing wind shear, and the eye quickly deteriorated. At around 1200 UTC on July 14, Halong made landfall on Okinawa with 10‑minute winds of 130 km/h (80 mph). Around that time, the typhoon moved through a weakness in the ridge, turning to the north and later accelerating to the northeast. The combination of cool, dry air, and the persistent wind shear removed the convection from the center by early on July 15, weakening Halong to tropical storm status. Later that day, the JTWC discontinued advisories while the storm was approaching Japan, and the agency classified Halong as extratropical. The JMA continued tracking the storm, and Halong struck both the Izu and Bōsō peninsulas along Honshu. Late on July 16, the JMA classified Halong as extratropical, and shortly thereafter the storm dissipated over the Kuril Islands. The extratropical remnants of Halong moved out of the basin late on July 19, just prior dissipating.
Typhoon Halong (2002)