31 Jan 2021 | 03:26 PM UTC
Australia: Adverse weather likely over northern Western Australia, Jan. 31 and in the coming days
Tropical Cyclone 18S tracking westward across northern Western Australia, Australia, late Jan. 31.
Event
Tropical Cyclone 18S (referred to locally as a Tropical Low) has formed over northern Australia late Jan. 31. As of 2000 AWST, the storm's center of circulation was approximately 280 km (174 miles) east southeast of Port Hedland. The storm is likely to maintain its strength as it tracks westward in the coming days as it tracks over land. Some uncertainty remains in the track and intensity forecast, and changes could occur over the coming days.
Government Advisories
As of 2046 AWST Jan. 31, the Australian Bureau of Meteorology maintains a warning zone for De Grey to Mardie, including Port Hedland, Karratha, and Dampier. A watch zone is in effect from Mardie to North West Cape, including Onslow and Exmouth. It has also indicated that heavy rainfall is forecast for east Pilbara late Jan. 31 through Feb. 1. West Pilbara is likely to be impacted from Feb. 2. Strong winds are forecast for the impact region. Authorities could issue new warnings or update existing advisories in the coming days.
Hazardous Conditions
Sustained heavy rainfall could trigger flooding in low-lying communities near streams, creeks, and rivers, as well as in urban areas with easily overwhelmed stormwater drainage systems. Sites located downstream of large reservoirs could experience flash flooding after relatively short periods of intense rainfall. Flooding could isolate some communities for several days. In addition to the heavy rain, flooding, and storm surge, damaging wind gusts will persist. Widespread and prolonged power outages due to uprooted trees and toppled utility lines are likely.
Transport
Inclement weather associated with the storm systems could trigger localized business, transport, and utility disruptions through at least Feb. 5. Floodwaters and debris flows may render some bridges, rail networks, or roadways impassable, impacting overland travel in and around affected areas. Areal flooding in urban locations could also result in severe traffic congestion, while strong winds will pose a hazard to high-profile vehicles. Heavy rain and low visibility may trigger flight disruptions at airports. Disruptions caused by inclement weather and resultant hazards, such as flooding, could persist well after conditions have improved. If there is severe damage to infrastructure, repair or reconstruction efforts may exacerbate residual disruptions.
Advice
Activate contingency plans. Heed all evacuation orders, if issued. Use extreme caution in low-lying coastal areas and near streams, creeks, and other waterways due to the high potential for severe flooding and storm surge. Stockpile water, batteries, and other essentials in advance. Charge battery-powered devices when electricity is available; restrict the use of cellular phones to emergencies only. Power down mobile devices when not in use. Keep important documents in waterproof containers. Observe strict food and water precautions, as municipalities could issue boil-water advisories following flooding events. Take precautions against insect- and waterborne diseases in the coming weeks. Keep any necessary medications in a waterproof container.
Plan accordingly for commercial, transport, and logistics disruptions in areas in the path of the storm, especially if vital infrastructure is damaged. Seek updated information on road conditions before driving or routing shipments through areas where flooding has occurred. Confirm flights before checking out of hotels or driving to the airport; clearing passenger backlogs may take several days in some locations.
