In August 2010, Bill Weir left the weekend edition to become co-anchor of "Nightline"; Marysol Castro left the show the following month. While Dan Harris officially took over as Weir's replacement that October, meteorologists from various ABC affiliates across the country filled in to provide the national weather segments for over a year after Castro's departure; eventually in November 2011, Ginger Zee, who previously served as a meteorologist at NBC O&O WMAQ-TV in Chicago, was appointed as weather anchor for the weekend editions. After Zee was promoted to weather anchor of the weekday edition of "Good Morning America" in December 2013, the program returned to having ABC affiliate meteorologists to substitute on the Saturday and Sunday editions, until ABC announced the appointment of Rob Marciano (a former CNN meteorologist who had recently departed as co-host of "Entertainment Tonight") as full-time weekend weather anchor in July 2014, effective that September.