Typhoon Hinnamnor brought wind and rain to the southern Ryukyu Islands on Saturday morning. At 5:00 a.m. EDT on Saturday the center of Typhoon Hinnamnor was located at latitude 24.1°N and longitude 124.6°E which put it about 35 miles (55 km) east-southeast of Ishigaki, Japan. Hinnamnor was moving toward the north 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 967 mb.

Typhoon Hinnamnor strengthened as it moved slowly through the southern Ryukyu Islands on Saturday morning. A small circular eye formed at the center of Hinnamnor’s circulation. The eye was east of Ishigakijima and southwest of Miyakojima. The eye was surrounded by a broken ring of thunderstorms and the strongest winds were occurring in that ring of storms. Bands of showers and thunderstorms were revolving around the core of Typhoon Hinnamnor. Storms near the core generated upper level divergence that pumped mass away from the typhoon.

Typhoon Hinnamnor had a large circulation. Winds to typhoon force extended out 70 miles (110 km) from the center of Hinnamnor. Winds to tropical storm force extended out 225 miles (360 km) from the center of circulation. The Hurricane Intensity Index (HII) for Typhoon Hinnamnor was 16.4. The Hurricane Size Index (HSI) was 22.3 and the Hurricane Wind Intensity Size Index (HWISI) was 38.7. Typhoon Hinnamnor was capable of causing widespread serious damage.

Typhoon Hinnamnor will produce strong gusty winds and locally heavy rain over the southern Ryukyu Islands during the next 12 hours. The eastern side of the eyewall could pass over or close to Miyakojima. Strong winds will be capable of causing serious damage. Heavy rain could cause flash floods in some locations. The winds will not be as strong on Ishigakijima because the western side of the eyewall will pass to the east. Weather conditions will improve gradually when Typhoon Hinnamnor moves farther to the north.

Typhoon Hinnamnor will move through an environment favorable for intensification during the next 24 hours. Hinnamnor will move over water where the Sea Surface Temperatures are 30˚C. It will move through a region where the upper level winds are weak and there will be little vertical wind shear. Typhoon Hinnamnor will intensity during the next 24 hours. Hinnamnor could strengthen to the equivalent of a major hurricane.

Typhoon Hinnamnor will move around the western end of a high pressure system over the Western North Pacific Ocean. The high pressure system will steer Hinnamnor toward the north during the next 36 hours. On its anticipated track Typhoon Hinnamnor will move across the southern Ryukyu Islands during the next 12 hours. The center of Hinnamnor will be west of Okinawa in 24 hours. Typhoon Hinnamnor could be southeast of Shanghai in 36 hours.