Bermuda-based reinsurers have unveiled losses of up to $US460 million ($451 million) from global natural catastrophes for the third quarter.

Floods and hurricanes across North America, the Caribbean, Asia and northern Europe were the main contributors to the losses.

Endurance Specialty has flagged some of the biggest losses, estimating a hit of $US99 million ($97.1 million), including $US26 million ($25.5 million) from floods that hit Denmark in July; $US21 million ($20.6 million) related to Hurricane Irene; and $US11 million ($10.8 million) from bushfires in Texas.

The remaining $US41 million ($40.23 million) loss relates to aggregate catastrophe reinsurances of regional insurance companies in the US midwest.

Endurance CEO David Cash says the losses were expected “given the $US2 billion ($1.96 billion) of third-quarter industry losses in the midwest that came on the heels of earlier tornadoes and floods in the same region, the $US1 billion ($981 million) losses from Danish floods and the $US5 billion ($4.9 billion) industry losses from Hurricane Irene”.

Platinum Underwriters has reported a $US53.5 million ($52.4 million) net loss from disasters that occurred in the third quarter, but has added a further $US58.5 million ($57.38 million) from the disasters that occurred earlier in the year.

Damage from Hurricane Irene along the east coast of the US and the Caribbean is expected to make up $US14 million ($13.7 million) of its total net losses.

Aspen Insurance says its initial loss estimate included $US10 million ($9.8 million) for Hurricane Irene and $US14 million for other weather-related catastrophes in the US, Asia and Scandinavia.

Aspen, which reports its half-yearly financial results later this week, says it will also increase the cost of its second-quarter weather-related losses by $US17 million ($16.7 million) to $US82 million ($80.38 million).

The company says this is consistent with the increase in estimated total market losses to $US20 billion ($19.64 billion) from $US15 billion ($14.7 billion).

Montpelier Re has forecast a $US30 million ($29.4 million) loss from Hurricane Irene and Texas fires, $US20 million ($19.64 million) from other US regional events and $US10 million from the Danish floods.

Montpelier Re also expects the June 2011 earthquake in New Zealand will cost it $US10 million ($9.8 million).

Alterra Capital is estimating damage from Hurricane Irene and other catastrophes will cost it between $US20 million and $US30 million.