EMC Insurance Group Inc. said yesterday that the company is set to report a second-quarter operating loss in the range of $1.02 to $1.08 per share, due largely to a record amount of catastrophe losses.

The company expects catastrophe losses to be approximately $2.06 per share after taxes, compared with 82 cents per share in the second quarter of 2010.

EMC’s property and casualty insurance segment is expected to report storm losses of approximately $29.5 million, or $1.48 per share, including $14.5 million associated with April tornadoes in Iowa, Alabama and several other Southern states and $6.4 million associated with the May tornado in Joplin, Mo.

EMC has revised its 2011 operating income guidance from the previous range of 40 to 65 cents per share down to 30 to 55 cents per share.