Here’s a very much non-exhaustive list of websites I use to keep an eye on what’s happening (or has happened) in the stratosphere.

StratObserve (Zac Lawrence)

NASA Ozonewatch (MERRA-2, GEOS data)

FU Berlin ECMWF Diagnostics

CPC Stratosphere-Troposphere Monitoring

JMA Climate System Monitoring: Stratospheric Circulation

Judah Cohen’s Arctic Oscillation and Polar Vortex Analysis and Forecasts

CPC Stratosphere Global Temperature Time Series

CPC Meteorological Conditions and Ozone in the Polar Stratosphere

CPC Stratospheric Intrusion Monitoring

GEOS Forecasts and Analyses

SSWC: Sudden Stratospheric Warming Compendium data set

Annual MERRA2 data

FU Berlin QBO

NOAA ESRL QBO dataset

NASA GSFC/GMAO GEOS stratosphere plots