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
BriefingStratospherePolar vortex
vT100_k1

Heat flux 100 hPa, wave 1

Wavenumber-1 part of the 100-hPa heat flux (favours displacements). Negative values indicate downward wave reflection.