Like many insurers, catastrophes have hit Chubb's bottom line. Last quarter Chubb says $329 million in pretax catastrophe losses caused a 19 percent drop in net income.

Tornadoes bombarded insurers with claims in the second quarter. Hurricane losses, specifically from Irene, are expected impact insurers when they report third quarter results.

Allstate estimates Hurricane Irene cost it $500 million. The company says it expects $735 million in August pretax catastrophe losses from eight events.

Hartford Financial Services Group says it expects pretax catastrophe losses for July and August of $150-to-$250 million. Between $75 million and $175 million can be attributed to Hurricane Irene.

State Farm says it has paid policyholders $5 billion in 2011, which is likely to be one of the busiest years for catastrophe losses for the company, it says.

Kemper Corp. today says it estimates catastrophe losses of $22-to-$27 million from Hurricane Irene.

Catastrophe modelers issued varied estimates of insurance industry insured losses from Hurricane Irene. Most recently, Risk Management Solutions says the storm could cost insurers $2-to-$4.5 billion in the U.S.

Modeler Eqecat says U.S. insured losses from Irene will fall between $1.5 billion and $2.8 billion. AIR Worldwide put the range of U.S. insured losses at $3-to-$6 billion.