Australia: Adverse weather forecast across western parts of Western Australia through at least May 13

Event

A low-pressure system embedded within a cold front is forecast to bring heavy rainfall and strong winds across western parts of Western Australia through at least May 13. Forecast models indicate the weather system will move ashore from the Indian Ocean over parts of Central West and western Gascoyne districts May 12, bringing strong winds and extensive showers embedded with thunderstorms. Locations that may be affected include Carnarvon, Denham, Geraldton, Kalbarri, Wooramel Roadhouse, and Yalgoo.

The Australian Bureau of Meteorology (BoM) has issued a severe weather warning for damaging winds and heavy rainfall for parts of Gascoyne and Central West districts. Damaging wind gusts peaking at around 90 kph (56 mph) are expected initially in coastal areas of northern Central West and western Gascoyne districts before spreading inland late May 12. Six-hourly rainfall totals of 5-8 cm (2-3 inches) are likely across the affected area and could trigger flash flooding. The BoM has also issued Marine Wind Warnings for some coastal areas May 12, with gale warnings in place for Leeuwin Coast and strong wind warnings in place for Perth Local Waters, Ningaloo Coast, Gascoyne Coast, Geraldton Coast, Lancelin Coast, Perth Coast, Bunbury Geographe Coast, and Albany Coast.

Hazardous Conditions
Sustained heavy rainfall could trigger flooding in low-lying communities near rivers, streams, and creeks. Urban flooding is also possible in developed areas with easily overwhelmed stormwater drainage systems. Sites located downstream from large reservoirs or rivers may be subject to flash flooding after relatively short periods of intense rainfall. Landslides are possible in hilly or mountainous areas, especially where heavy rainfall has saturated the soil.

Authorities could issue mandatory evacuation orders for flood-prone communities over the coming days. Disruptions to electricity and telecommunications services are possible where significant flooding or landslides impact utility networks.

Transport
The severe weather will likely contribute to transport disruptions throughout the region. Traffic and commercial trucking delays might occur along regional highways. Flooding downpours could inundate some low-lying roads in areas with poor drainage. Strong winds might also pose a hazard to high-profile vehicles. Hazardous weather conditions might cause flight delays and cancellations at airports in the affected region. Authorities may temporarily suspend port operations along parts of the west coast if strong winds trigger hazardous sea conditions, impacting freight and passenger maritime traffic.

Advice

Monitor local media for updated emergency and weather information. Seek updated information on weather and road conditions before driving or routing shipments through areas where severe weather is forecast. Plan accordingly for potential delivery delays if routing shipments by truck through the affected area. Do not attempt to drive through flooded areas. Charge battery-powered devices in the case of prolonged electricity outages.

Resources

Australian Bureau of Meteorology (BoM)
Western Australia Department of Fire and Emergency Services (DFES)
Main Roads Western Australia