By Eric Leister, AccuWeather meteorologist
December 27, 2017, 12:08:34 PM EST
The first tropical cyclone of the season has formed in the Australian Basin and Western Australia will be at risk for dangerous flooding into Friday.
Interaction with land will limit any further strengthening; however, Hilda is expected to remain a Category 1 cyclone into Thursday morning as it skirts the Kimberley coastline between Broome and Bidyadanga.
A Category 1 cyclone in the Australian Basin is equal to a tropical storm in the Atlantic and Pacific oceans.
Regardless of track and intensity, heavy rain will threaten areas from Kimbolton to Derby and Broome into Friday, even as the cyclone tracks inland across Western Australia.
Rainfall has already totaled more than 150 mm (6 inches) in Broome along with tropical storm force winds.
Waves of heavy rain will also move inland across parts of northwestern Western Australia. Any areas that get trapped under a more persistent band of rain could get flash flooding.
Rainfall amounts of 100-200 mm (4-8 inches) are expected, with local amounts up to 300 mm (12 inches).
Areas from Camballin and Willard to Gingerah should be on alert for possible flash flooding.
The threat for damaging winds will be…