[1] After reaching Category 4-equivalent intensity on the Saffir–Simpson hurricane scale, adverse atmospheric conditions along with internal structural changes resulted in temporary weakening.

The storm attained peak strength with winds of 175 km/h (109 mph)[2][nb 1] and a pressure of 930 mbar (hPa; 27.46 inHg) on October 1 as it approached Taiwan.

Interaction with the mountainous terrain of the island and further structural changes caused some weakening before the typhoon made landfall near Hualien City early on October 2.

[3] Crossing the island in six hours, Longwang emerged over the Taiwan Strait before moving onshore again later that day, this time in Fujian Province, China as a minimal typhoon.

Prior to the storm's arrival, officials in Taiwan activated all emergency operations centers and urged residents to take serious precautions.

[5] On September 24, 2005, the Joint Typhoon Warning Center (JTWC) began monitoring a tropical disturbance north of the Mariana Islands.

[nb 3] Convective banding features soon consolidated around a low-pressure area associated with the system, prompting the issuance of a Tropical Cyclone Formation Alert the following day.

[8][nb 4] Situated in a region characterized by low wind shear and favorable upper-level divergence, steady intensification ensued.

A temporary turn northwest occurred on September 26 as Longwang approached a weakness in the ridge which had previously steered it west-northwestward.

[8] Once at typhoon status, the storm resumed a more westerly track as a second ridge extending from eastern Asia became the dominant steering factor.

[7] At the end of this phase, the JMA assessed peak winds at 155 km/h (96 mph) while the JTWC rated it as a Category 4-equivalent typhoon on the Saffir–Simpson hurricane scale.

[8][10] On September 29, the Philippine Atmospheric, Geophysical and Astronomical Services Administration assigned the typhoon the local name Maring as it entered their area of responsibility.

[7] The following day, Longwang underwent a structural change, transitioning from asymmetrical banding to symmetrical, making it an annular tropical cyclone.

[11] Additionally, an increase in westerly wind shear caused the interior structure to become asymmetric, with a southwest to northeast tilt noted by dropsondes released by the Dropwinsonde Observations for Typhoon Surveillance project.

[12] Once the transition into an annular cyclone completed,[11] Longwang re-intensified and attained its peak intensity on October 1 while situated 400 km (250 mi) south of Okinawa.

At 1848 UTC, Doppler weather radar velocity estimates indicated winds of 240 km/h (150 mph) at an altitude of 3 km (1.9 mi).

After flying in the storm for ten hours, the unmanned vehicle encountered severe turbulence and crashed about 80 km (50 mi) east of Taitung City.

[12] Just six hours after moving inland, Longwang emerged over the Taiwan Strait with its circulation mostly intact; however, weakening continued as it approached eastern China.

[8][10] The first indications of Longwang impacting Taiwan were on September 27, when the Central Weather Bureau (CWB) stated the storm was on a westerly course to the island.

Early on October 1, the whole of Taiwan was placed under a storm warning, prompting the Emergency Center to go to its maximum alert level.

[18] With international airports shut down, President Chen, who was returning from a visit to the United Arab Emirates, was forced to land in Indonesia.

[28] Due to the substantial loss of life and damage, the name Longwang was retired and replaced with Haikui (Chinese: 海葵) in 2006.

Striking Taiwan as a powerful storm early on October 2, Longwang brought destructive winds to many areas along the island's east coast.

High waves broke a 200 m (660 ft) stretch of a levee near ChiAnn, a coastal community in Hualien, and flooded nearby homes.

[citation needed] Along the coast, a 7,000 ton cargo vessel broke loose from its mooring and drifted for 1 km (0.62 mi) before running aground and breaking apart.

[7] The greatest damage from Longwang took place in Fujian Province,[25] especially within the city of Fuzhou where torrential rains overwhelmed the Jinan River and its tributaries.

[25] A large auto plant owned by the Fujian Motor Industry Corporation, covering 83 hectares, was completely flooded.

Following an investigation by the Central Military Commission and State Council, all five were dismissed from their posts while Hou Yongjun, the director of the brigade, was to be prosecuted.