Here are links to a number of different resources I’ve found useful.
Stratospheric Processes and Prediction
Tomer Burg’s stratospheric forecast products
Freie Universitat Berlin Polar Vortex
NASA Antarctic Ozone Hole Watch
NASA Arctic Ozone Hole + Meteorology
Japanese Meteorological Agency Strat Monitoring
Tropospheric and Surface Processes
Alicia M. Bentley’s Weather Maps