 It moved slowly and erratically between 13 and 16 April as a new middle-level ridge developed to its west.Its peak estimated intensity of 930 hPa was reached during this period and weakening commenced as vertical shear increased across the system.For a period of about one day, commencing 1000, 13 April, Tropical Cyclone Watch advices were issued for parts of the Pilbara and Kimberley coastline.