Thirty- and 15-year fixed mortgage rates rose noticeably today, while 5/1 ARM rates rose by a hair, according to a NerdWallet survey of mortgage rates published by national lenders on Thursday. Mortgage Rates Today, Friday, Jan. 13 (Change from 1/12) 30-year fixed: 4.30% APR (+0.04) 15-year fixed: 3.70% APR (+0.03) 5/1 ARM: 3.84% APR (+0.01) Nationwide foreclosure activity...