Typhoon Lan moved toward Honshu on Friday. At 11:00 p.m. EDT on Friday the center of Typhoon Lan was located at latitude 28.7°N and longitude 141.5°E which put it about 485 miles (785 km) south-southeast of Tokyo, Japan. Lan was moving toward the west-northwest at 7 m.p.h. (11 km/h). The maximum sustained wind speed was 100 m.p.h. (160 km/h) and there were wind gusts to 120 m.p.h. (195 km/h). The minimum surface pressure was 960 mb.

Typhoon Lan was weakening on Friday night. The inner of a rainband wrapped around the existing eye and eyewall and a larger, outer eyewall formed. The formation of concentric eyewalls was disrupting the low level convergence into the inner eyewall and the inner eyewall was weakening. Since the strongest winds were occurring in the inner eyewall, the maximum wind speed decreased when the inner eyewall weakened. Bands of showers and thunderstorms were revolving around the concentric eyewalls. Storms around the concentric eyewalls generated upper level divergence that pumped mass away from the typhoon.

Winds to typhoon force extended out 35 miles (55 km) from the center of Typhoon Lan. Winds to tropical storm force extended out 140 miles (225 km) from the center of circulation. The Hurricane Intensity Index (HII) for Typhoon Lan was 16.5. The Hurricane Size Index (HSI) was 11.4 and the Hurricane Wind Intensity Size Index (HWISI) was 27.9.

Typhoon Lan will move through an environment favorable for intensification during the next 24 hours. Lan will move over water where the Sea Surface Temperatures are near 28°C. It will move through a region where the upper level winds are weak and there will be little vertical wind shear. However, Typhoon Lan is likely to weaken during the next 24 hours even though it will be in a favorable environment. The maximum wind speed is likely to continue to decrease as the inner eyewall dissipates.

Typhoon Lan will move around the western part of a high pressure system over the Western North Pacific Ocean. The high pressure system will steer Lan toward the northwest during the next 24 hours. On its anticipated track, Typhoon Lan will approach Honshu in less than 72 hours. Lan is likely to be a typhoon when it approaches Honshu.