The other uncertainty concerns the intensity of Damien at the time of impact. The global forecast models present some disparities on the intensification at the time of the south descent. The euro IFS model is the most aggressive and suggests the possibility of rapid intensification before impact. For now, the BOM is considering category 4, which corresponds to a major category 3 hurricane on the Saffir-Simpson scale, and intense cyclone on the intensity scale of the southwest Indian Ocean.
The impact being in 24 hours, the YELLOW ALERT is in force. Thus, people living in or near Port Hedland and south of Millstream (including the town of Port Hedland, Whim Creek, Point Samson, Wickham, Roebourne, Karratha, Dampier and Barrow Island) must prepare for cyclonic conditions and to evacuate to take shelter.
BLUE ALERT for people in or near Wallal Downs to Port Hedland and Mardie to Onslow but not including Onslow, (including the towns of Pannawonica, Tom Price, Paraburdoo, Nullagine and Marble Bar) need to prepare for cyclonic weather and organise an emergency kit including first aid kit, torch, portable radio, spare batteries, food and water.