Atmospheric-river IVT frames (North Pacific, Feb 2017) — Galaxy CellProfiler object-tracking tutorial data

40 RGB PNG frames of ERA5 vertically integrated water-vapour transport (IVT) magnitude over the North Pacific, 6-hourly from 2 to 11 February 2017, derived from the public ARCO-ERA5 archive (IVT = sqrt(u^2 + v^2)). Each frame renders an atmospheric river as a bright filament on a dark background and is named NPacific_IVT_0000.png ... NPacific_IVT_0039.png. This is the Earth-observation dataset for the Galaxy Training Network tutorial 'Object tracking using CellProfiler' (https://gxy.io/GTN:T00516), used to demonstrate that a CellProfiler nucleus-tracking pipeline can be reused to detect and track atmospheric rivers. Preprocessing notebooks, full Galaxy run provenance, and the software archive: https://github.com/annefou/fiesta-galaxy-cellprofiler-eo (DOI 10.5281/zenodo.20811614). Part of the OSCARS-FIESTA project.