Lionrock killed eight people along its path: Four in the Philippines, and two in Hong Kong and Vietnam respectively, and damages related to the storm was $74.9 million (2021 USD).

Later analysis by the agency indicated a favorable environment for further development of the system, with warm 30 °C (86 °F) sea surface temperatures, low wind shear and good equatorial outflow.

[4][5] Also that day, the JTWC issued a Tropical Cyclone Formation Alert on the system as it showed enough convection on the west of a discernible low-level circulation center while tracking west-northwestward.

Continuing its track to the west-northwest, it made two more landfalls in Palawan; one on Iloc Island in Linapacan and over El Nido before finally moving over and accelerated into the South China Sea.

[10] A day later at 06:00 UTC, the Japan Meteorological Agency (JMA)[nb 2] recognized the system in their bulletins as a tropical depression.

[14] Meanwhile, while centered over the northern Paracel Islands, the JMA reported that the system intensified to a tropical storm according to surface wind analysis and Dvorak ratings, nine hours later.

[15] However, the JTWC only followed suit on the next day as it turned northward as it was steered by the southwestern periphery of a subtropical ridge located to the northeast.

[16] The storm maintained this intensity before making landfall over Qionghai on 22:50 CST (14:50 UTC), further organizing its LLCC and its overall structure while located inland.

[19] However, it maintained its intensity of 35 knots (65 km/h; 40 mph) before it made its last landfall over Haiphong, near Cat Bi International Airport on 09:00 UTC on the next day, with the JTWC issuing its final warning as a tropical depression.

[20] The JMA also downgraded Lionrock to a depression three hours back as it tracked westward while over Quảng Ninh Province of Vietnam.

[22] The weather agency also warned flash floods, heavy rains, landslides and gusty winds from Lannie as the system moved over the country.

[24] Metro Manila and some provinces in Luzon, including Isabela and Cagayan experienced heavy downpours from the "trough extension" of Lannie.

[25] A family of three were also moved into safety by the Philippine Coast Guard (PCG) on October 4 when their boat sank during the high waves from the storm between Pamilacan Island and Loay, Bohol while two more fishermen were rescued by the authorities off Abacan River in Cortes.

[26] In Tanjay, a man slipped into a spillway and were subsequently helped by stranded residents near the area while 50 households were evacuated to safety as a river overflowed in Bais, Negros Oriental.

[31] According to the National Disaster Risk Reduction and Management Council (NDRRMC), 248 persons were displaced by Lannie and 1,701 families (8,048 individuals) were affected.

Scaffolding also fell on a street in Wong Tai Sin and over Broadwood Road due to strong winds from Lionrock, trapping two people in their respective cars.

Floods swept away one person and seven cattles in Duy Xuyên District, Quảng Nam Province[58] On Saturday, the victim was confirmed dead.