Tracker for convective clusters and tropical cyclone seeds, using six hourly climate model output. Detailed documentation in Hsieh, T. L., Vecchi, G. A., Yang, W., Held, I. M., & Garner, S. T. (2020). Large-scale control on the frequency of tropical cyclones and seeds: a consistent relationship across a hierarchy of global atmospheric models. Climate Dynamics, 55(11), 3177-3196.

Example: python tracker.py path_to_6hrly_output 111 150

Computes the seed propensity index of Hsieh, Yang, Vecchi, and Zhao (2022) given the monthly mean omega_500 and vort_850.