The Walt Disney World Half Marathon, scheduled for Saturday, Jan. 7, has been cancelled due to the weather. Other races scheduled for the day have also been cancelled. Here's the official statment from runDisney's Facebook page:
"In an abundance of caution, the Walt Disney World Resort has cancelled all running events on Saturday, Jan. 7, 2017 due to weather conditions. This includes the Walt Disney World Half Marathon and the Disney Kids Races."