Cyclone Seroja Slams Australia, Causing Significant Damage to Coastal Towns

Cyclone Seroja Australia Annotated

Cyclone Seroja Australia, April 11, 2021

The category three cyclone made a rare landfall in Western Australia, causing significant damage to coastal towns.

On April 11, 2021, a category three storm made a rare landfall in Western Australia, causing significant damage to coastal towns that are mostly ill-equipped for cyclones. Tropical Cyclone Seroja tore through 1,000 kilometers (600 miles) of land, knocking down trees and damaging buildings along its southward path. At least 15,000 homes lost power. Seroja has since weakened and moved offshore, but government agencies are now dealing with the damage.

The Visible Infrared Imaging Radiometer Suite (VIIRS) on the Suomi NPP satellite captured this image on April 11, hours before the storm made landfall.

Kalbarri, a resort town of around 1,500 people, received the brunt of the storm’s force. Seroja made landfall just south of Kalbarri on the evening of the 11th and damaged about 70 percent of the town’s structures, according to news reports. Wind gusts clocked in at 170 kilometers (100 miles) per hour—likely the strongest winds in the area in more than 50 years. Overnight, Kalbarri received around 167 millimeters (6.6 inches) of rain.

Cyclone Seroja Australia

Tropical cyclone Seroja. Credit: U.S. Navy

Seroja continued southeast and caused damage in the city of Geraldton, too. Downgraded to a category two storm at the time, Seroja was the first storm of that intensity to hit Geraldton in more than 50 years. The storm was further downgraded on April 12th as it moved across the Wheat Belt, located in the southwest corner of Australia.

Seroja’s southward trajectory is unusual; scientists estimate that cyclones of this intensity have only traveled this far south 26 times in the past 5,000 years. However, Seroja curved south when it interacted with a different tropical system earlier in the week. This clash—a rare phenomenon known as the Fujiwhara Effect—caused the systems to rotate around one another and launched Seroja towards the west. Seroja intensified due to warmer-than-normal sea surface temperatures influenced by La Niña conditions. Winds kept Seroja away from the coast and the weakened effects of land, allowing the cyclone to sustain relatively high intensity.

Before entering Australian waters, Seroja had already caused significant damage to Indonesia. Seroja, which made landfall there on April 5, caused flash flooding and landslides. More than 160 people were killed and 22,000 people have been displaced. The storm was the strongest tropical cyclone to hit Indonesian land since 2008.

NASA Earth Observatory image by Joshua Stevens, using VIIRS data from NASA EOSDIS LANCE, GIBS/Worldview, and the Suomi National Polar-orbiting Partnership.

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