Typhoon In-Fa continued to churn westward over the Western North Pacific Ocean east of the Northern Marianas on Tuesday.  At 11:00 p.m. EDT on Tuesday the center of Typhoon In-Fa was located at latitude 15.0°N and longitude 159.3°E which put the center about 940 miles (1515 km) east of Saipan.  In-Fa was moving toward the west-northwest at 11 m.p.h. (17 km/h).  The maximum sustained wind speed was 140 m.p.h. (225 km/h) and there were wind gusts to 165 m.p.h. (265 km/h).  The minimum surface pressure was 945 mb.

An eyewall replacement cycle occurred in the core of Typhoon In-Fa on Tuesday.  The original eye and eyewall disappeared by Tuesday evening.  A new eye with a diameter of 40 miles (65 km) was at the center of In-Fa’s circulation.  The eye was surrounded by a ring of thunderstorms and the strongest winds were occurring in that ring of storms.  Bands of showers and thunderstorms were revolving around the center of Typhoon In-Fa.  Storms near the center of In-Fa generated upper level divergence that pumped mass away from the typhoon.  The removal of mass in the upper levels was nearly equal to the convergence of mass in the lower levels of the atmosphere.  So, the surface pressure did not change much on Tuesday.

The distribution of wind speeds in Typhoon In-Fa was very symmetrical.  Winds to typhoon force extended out 45 miles (75 km) from the center of In-Fa’s circulation.  Winds to tropical storm force extended out 105 miles (165 km) from the center of Typhoon In-Fa.

The Hurricane Intensity Index (HII) for Typhoon In-Fa is 28.3.  The Hurricane Size Index (HSI) is 17.1 and the Hurricane Wind Intensity Size Index (HWISI) is 45.4. Typhoon In-Fa is similar in size to Hurricane Ian when Ian hit Southwest Florida in 2022.  In-Fa is not quite as strong as Ian was.

Typhoon In-Fa will move through an environment that will be favorable for intensification during the next 24 hours.  In-Fa will move over water where the Sea Surface Temperatures are near 29°C.  It will move through a region where the upper level winds are weak and there will be little vertical wind shear.  Typhoon In-Fa could intensify during the next 24 hours unless another eyewall replacement cycle occurs.

Typhoon In-Fa will move around the southern part of a high pressure system that is over the Western North Pacific Ocean.  The high pressure system will steer In-Fa toward the west-northwest during the next 24 hours.  On its anticipated track, Typhoon In-Fa will continue to move toward the Northern Marianas.