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In this paper extensions to an existing tracking algorithm are described. These extensions implement adaptive tracking constraints in the form of regional upper-bound displacements and an adaptive track smoothness constraint. Together, these constraints make the tracking algorithm more flexible than the original algorithm (which used fixed tracking parameters) and provide greater confidence in the tracking results. The result of applying the new algorithm to high-resolution ECMWF reanalysisdoi:10.1175/1520-0493(1999)127<1362:acfft>2.0.co;2 fatcat:zld45oglabdyfaeafakqhlmt7u