Insurer Chubb expects the losses from the catastrophes events that occurred in the months of April and May 2011 to be between $250m to $310m, before tax.

Primarily the losses are linked to the tornadoes and severe storms that hit the US these two months.

P&C insurer Chubb said the impact of these catastrophes events will be reflected in its second quarter 2011 financial results.

In its previous disclosure for the quarter ended March 31, 2011, the insurer has estimated a catastrophe losses for the month of April 2011 were between $175m to $225m before tax.

Zurich Financial has estimated a total loss of nearly $295m in claims related to the severe weather-related events.

Recently, personal lines insurer Allstate expects the May catastrophic pre-tax losses to be $600m for the month of May 2011, in addition to its April estimated loss of $1.4bn.

Disaster-modeling firm AIR Worldwide has estimated that the total insured losses could be between $4bn to $7bn from the recent catastrophic losses in US.