Remote Aboriginal communities across the north-east Kimberley — from the WA-NT border through to Kalumburu — are being urged to prepare for severe weather this afternoon as Tropical Cyclone Fina moves closer to Western Australia.

The system has been a Category 4 cyclone over water and is tracking south-west through the Joseph Bonaparte Gulf.

The Bureau of Meteorology (BOM) says Fina is expected to weaken as it approaches the coast this afternoon (Monday) and evening, possibly dropping to Category 3 before landfall.

A cyclone warning remains in place from the WA-NT border to east of Kalumburu. Destructive winds, heavy rainfall and possible flash flooding are forecast for coastal parts of the north-east Kimberley later today.

WA's Department of Fire and Emergency Services has issued a "Cyclone Emergency Warning — Shelter Indoors Now" for parts of the Cambridge Gulf region, advising people in the affected zone to remain indoors and secure their homes as conditions deteriorate.

The alert warns residents to be prepared for power loss, falling debris and rapidly intensifying weather.

Authorities are urging communities to secure loose items, prepare emergency kits, move vehicles under cover and board up exposed windows.

Residents are also being encouraged to avoid waterways, keep pets and livestock safe, and ensure phones and devices are fully charged.

The cyclone's destructive core is currently forecast to cross the coast between the King George River Mouth and the Berkeley River Mouth - a remote stretch of the north-east Kimberley coastline - later this afternoon, according to the BOM.

Kalumburu sits just west of the warning zone and is expected to experience strong winds and heavy rain as the system passes nearby.

Conditions are expected to ease overnight as the system weakens after landfall.

The warnings come as Top End communities continue cleaning up after Fina toppled trees and cut power across parts of Darwin over the weekend.