Predicting a tropical cyclone's path can be challenging; there are many global and local factors that come into play. The storm's size and path can directly influence what sort of wind patterns guide, enhance or hinder its growth, and vice versa! Forecasters have computers that take huge amounts of data and try to predict where the storm will go and usually can calculate 2-3 days out fairly accurately. This is where you hear the terms computer models and spaghetti models being used. Generally the forecast track or path is given with the average consensus of these models. The National Hurricane Center has the most up-to-date information on tropical cyclone developments, forecasts and weather alerts, discussions analyzing the data and more. http://www.nhc.noaa.gov/