 It entered the warning area of TCWC Wellington later that day as it passed south of 25°S, and completed extratropical transition early on January 25.Forming as tropical depression on January 25, Arthur rapidly intensified into a strong Category 2 cyclone on the Australian intensity scale according to the Regional Specialized Meteorological Centre in Nadi, Fiji.The Joint Typhoon Warning Center assessed the storm to have peaked as a minimal Category 1 cyclone.