As it accelerated over open waters, the system brushed the islands of Iwo Jima and Chichi-jima before transitioning into an extratropical cyclone on June 1.

[1] Despite only having winds around 30 km/h (19 mph),[2] it was classified as a tropical depression early the next day and assigned the name Lucille by the Joint Typhoon Warning Center (JTWC).

[1] Shortly after the JTWC issued their final advisory on Lucille, the Japan Meteorological Agency (JMA) began monitoring the system near Luzon as a tropical depression.

[2] By May 28, radiosonde data from Clark Air Base in Luzon indicated that the second system acquired a closed circulation at the 500 mb level and began moving northeastward.

Once back over open waters, the system intensified as it accelerated northeastward, attaining tropical storm intensity early on May 30.

[1][2] Tropical Storm Lucille attained its peak intensity late on May 30 with winds of 85 km/h (53 mph) and an estimated barometric pressure of 985 mbar (hPa; 29.09 inHg).

[1] At this time, the China Meteorological Administration assessed Lucille to have been a stronger system, attaining typhoon status with two-minute sustained winds estimated at 125 km/h (78 mph).

Sustained winds on Chichi-jima reached 95 km/h (59 mph); however, these were determined to be unrepresentative of Lucille's actual intensity due to natural funneling on the island.

[4] Across the northern Philippines, torrential rains associated with Lucille, the secondary low, and a subsequent southwesterly monsoon caused extensive flooding.

[7] Taking place mainly in the suburban communities surrounding Manila, rivers over-topped their banks and inundated "squatter" areas.

[5] The heart of Manila was spared flooding as the river running through the city began to recede after nearly over-topping the concrete dike surrounding it.

On May 29, Quezon City mayor Norberto S. Amoranto sent an emergency request to the Philippine Air Force to rescue people trapped on rooftops.