Deadly storms that struck Australia’s east coast in December led to insured losses of $1.56 billion, the largest catastrophe loss of last year, analyst Perils says.

Perils had estimated the damage at $1.55 billion in April.

The storms hit Victoria, NSW and Queensland from December 23-29 as a low-pressure system over the southeast was blocked by a high-pressure system over the northern Tasman Sea. The low’s cold front met hot and humid air, causing severe convective storms with large hail, intense winds, flash floods and tornadoes.

Damage in Queensland made up 71% of the industry loss, while NSW accounted for 24% and Victoria 5%. Hail was a major contributor, with stones of up to 10cm in diameter reported, according to the global catastrophe data analyst.

Head of Perils Asia-Pacific Darryl Pidcock says last year was relatively benign for major natural catastrophes, but the December event was a reminder of increasing risk from convective storms in coastal regions and the potential for contrasting air pressure systems prolonging activity.

Personal property damage made up most of the losses, while commercial property represented 17% and motor 11%.

The Insurance Council of Australia declared the event a catastrophe on December 29. There were 10 deaths, most caused by drowning or falling trees.

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