PyStormTracker

PyStormTracker is a Python package for cyclone trajectory analysis. It provides cyclone detection, trajectory construction, and track-based analysis for meteorological and climate datasets. The package includes a Numba Simple Tracker implementation with high-level concept lineage from Yau and Chang (2020) and TRACK-compatible algorithms with scientific lineage from Hodges (1994, 1995, 1999). The project was initially developed at the National Center for Atmospheric Research (NCAR) during the 2015 SIParCS program.

• Simple, TRACK-compatible Hodges, and HEALPix tracking.
• NetCDF, GRIB, Zarr, TrackJSON, TRACK tdump, and IMILAST support across regular, Gaussian, reduced-Gaussian, projected, and HEALPix grids.
• Spectral preprocessing, feature refinement, track comparison, variable sampling, and storm-track metrics.
• Serial, Dask, and MPI execution with Numba-accelerated numerical kernels.

PyStormTracker requires Python 3.12+.

pip install PyStormTracker

stormtracker track \
    -i data.nc \
    --variable msl \
    -o tracks.trackjson \
    -m min \
    -a hodges

Python API:

import pystormtracker as pst

tracker = pst.HodgesTracker()
tracks = tracker.track(data="data.nc", variable="msl", detection_mode="min")

See the Quickstart for installation options, CLI and Python usage, formats, sample data, and development commands.

Documentation · Quickstart · CLI · API · Architecture · Hodges / TRACK · HEALPix · TrackJSON · Benchmarks

If you use PyStormTracker in research, please cite the software:

• Yau, A. M. W., 2026: PyStormTracker: A High-Performance Cyclone Tracker in Python. Zenodo, doi:10.5281/zenodo.18764813.

PyStormTracker was originally presented as:

• Yau, A. M. W., K. Paul, and J. Dennis, 2016: PyStormTracker: A Parallel Object-Oriented Cyclone Tracker in Python. 96th American Meteorological Society Annual Meeting, New Orleans, LA. Zenodo, doi:10.5281/zenodo.18868625.

For methods used by the Simple tracker and storm-track analysis:

• Yau, A. M. W., and E. K. M. Chang, 2020: Finding Storm Track Activity Metrics That Are Highly Correlated with Weather Impacts. Part I: Frameworks for Evaluation and Accumulated Track Activity. J. Climate, 33, 10169–10186, doi:10.1175/JCLI-D-20-0393.1.

For the feature-identification and trajectory-linking methods implemented by HodgesTracker:

• Hodges, K. I., 1994: A General Method for Tracking Analysis and Its Application to Meteorological Data. Mon. Wea. Rev., 122, 2573–2586, doi:10.1175/1520-0493(1994)122<2573:AGMFTA>2.0.CO;2.
• Hodges, K. I., 1995: Feature Tracking on the Unit Sphere. Mon. Wea. Rev., 123, 3458–3465, doi:10.1175/1520-0493(1995)123<3458:FTOTUS>2.0.CO;2.
• Hodges, K. I., 1999: Adaptive Constraints for Feature Tracking. Mon. Wea. Rev., 127, 1362–1373, doi:10.1175/1520-0493(1999)127<1362:ACFFT>2.0.CO;2.

PyStormTracker uses ducc0 for spherical-harmonic transforms and related spherical numerical operations:

• Reinecke, M., 2020: DUCC: Distinctly Useful Code Collection. Astrophysics Source Code Library, record ascl:2008.023.

For the IMILAST cyclone-tracking intercomparison:

• Neu, U., et al., 2013: IMILAST: A Community Effort to Intercompare Extratropical Cyclone Detection and Tracking Algorithms. Bull. Amer. Meteor. Soc., 94, 529–547, doi:10.1175/BAMS-D-11-00154.1.

Additional method-specific references are given in the relevant documentation.

PyStormTracker is distributed under the BSD 3-Clause License.