Both Nordstrom Inc. and Costco Wholesale Corp. reported increases in January same-store sales at stores open a year or longer. Seattle-based Nordstrom (NYSE: JWN) reported same-store sales rose 11.4 percent last month compared with a year earlier. Total retail sales for the four-week period that ended Jan. 26 rose 14.9 percent from 2012. Issaquah-based Costco (NASDAQ: COST) reported same-store sales rose 4 percent last month from 2012. Analysts had expected January same-store sales to rise 3.9…