A powerful tropical storm is forecast to track near Okinawa, Japan, on Monday before moving towards the south-east of the country. Typhoon Jangmi (also known as Typhoon No 6) has formed within the monsoonal gyre over the Philippine Sea.
A monsoonal gyre is a large, slow-rotating weather system that spawns typhoons through smaller vortices formed within it. This flow can intensify storms. Such typhoons are typically characterised by broad areas of low pressure and extensive wind fields, often without a distinct eye.
