Mortgage delinquency rates jumped higher in the fourth quarter because of a variety of factors, not the least of which was the economic upheaval caused by severe hurricanes in the Gulf Coast. Large mortgage servicers reported a weighted-average overall delinquency rate of 3.52 percent as of the end of last year, according to the Inside Mortgage Finance quarterly lender survey. That was up 27 basis points from the average 3.25 percent rate reported in the… [One data table included]