FORECASTCONTEXT.COM · THE LARGE-SCALE STATE BEHIND THE FORECAST BRIEFINGMOTIONOUTLOOKMETHODSAPI☀ AUTO

FORECAST CONTEXT

DATA THROUGH 2026-10-12 · UPDATED 2026-10-13 11:02 UTC

ERA5 + GFS2.5°DAILY
BriefingStratosphereVortex geometry
vortex_regime

Vortex regime (k-means)

Nearest of k clustered 10-hPa height-anomaly patterns (Nov–Mar training); regimes are numbered by frequency. — method after Cohen et al. 2021