08 Dec 2020 | 05:49 PM UTC
Australia: Storm system may bring heavy rainfall that could lead to flooding in western region through Dec. 10
Heavy rainfall, strong winds, and possible flooding forecast in Western Australia through at least Dec. 10. Disruptions possible.
Event
A strengthening low-pressure system will bring rounds of storms containing heavy rainfall and strong winds across portions of Western Australia through Dec. 10; including Broome. Heavy rainfall is ongoing in that region and forecast models indicate the rain will spread southeastward throughout the state over the coming hours. The system should fully dissipate by late Dec. 10 or Dec. 11.
The Bureau of Meteorology has issued the following watches and warnings:
Severe Weather Warning: Kimberley, Pilbara, and North Interior districts
Initial Flood Warning: Sandy Desert, Kimberley District
Initial Flood Watch: Pilbara District
Officials will likely update and possibly extend the coverage of the relevant weather alerts over the coming days as the system progresses
Hazardous Conditions
Forecast models indicate rainfall totals of 2.5-5 cm (1-2 inches) are expected across the affected area over the coming days, with the highest totals likely to be observed in western Kimberley and northeastern Pilbara districts. Locally higher totals are possible. 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 or a lack of 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 cannot be discounted in hilly or mountainous areas, especially where the soil has become saturated by heavy rainfall. Disruptions to electricity and telecommunications services are possible where significant flooding, strong winds, or landslides impact utility networks.
Transport
Floodwaters and debris flows may render some bridges, rail networks, or roadways impassable, impacting overland travel in and around affected areas. Ponding on road surfaces could cause hazardous driving conditions on regional highways. Authorities could temporarily close some low-lying routes that become inundated by floodwaters.
Severe weather could also trigger flight delays and cancellations at regional airports including, but not limited to, those serving Broome (BME). Authorities may suspend port operations temporarily or close beach fronts along the Indian Ocean if strong winds trigger hazardous sea conditions. Flooding could block regional rail lines; freight and passenger train delays and cancellations are likely in areas that see heavy rainfall and potential track inundation. Localized business disruptions may occur in low-lying areas; some businesses might not operate at full capacity because of flood damage to facilities, possible evacuations, and some employees' inability to reach work sites.
Advice
Monitor local media for weather updates and related advisories. Confirm all transport reservations and business appointments prior to travel. Make allowances for localized travel delays, as well as potential supply chain disruptions, where flooding has been forecast. Do not drive on flooded roads. Charge battery-powered devices in case prolonged electricity outages occur.
