Computer driven math models are used to forecast the position, track and intensity of hurricanes. Over the past fifty years the models have been growing more and more sophisticated. In 2007 the premiere models are known as global models. The best of the lot are the "big four." The OFCL is the Official Forecast of the National Hurricane Center and it continues to be the benchmark.

1. GFDL - Geophysical Fluid Dynamics Laboratory (in Princeton, N.J) is the best performing single model. Upgraded in 2007 and retested using actual 2005 data it si tops in predicting the track and intensity of storms
2. GFS - Global Forecast System
3. NOGAPS - US Navy
4. UKM - United Kingdom meteorological

The best results to date have come from combining and averaging the models according to some arcane formulas.

Weather underground has a nice summary of the top models as of 2007

In addition to the tracking models the SHIPS model attempts to forecast the intensity of the storm.

Generally the models are in agreement with at most one of the models in disagreement.

The National Weather Service uses its own model which they claim gives better long term accuracy than any of the others.