The phrase "forecast track" refers to the predicted path or route that something, like a storm or hurricane, is expected to follow in the future. Full definition
This has led to an enormous improvement in forecasting the track of typhoons. (newscientist.com)
Here's the scene in the Miami forecasting center, which illustrates why the midpoint of hurricane forecast tracks is relatively meaningless: (dotearth.blogs.nytimes.com)
Experts urged residents in potentially impacted areas to monitor Irma's predicted paths but to avoid latching onto any specific forecast track. (usatoday.com)