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
BriefingWeather regimesWeather regimes
WR_SH4_label

Active regime · SH4

Southern Hemisphere regimes (Z700), nearest centroid. 0 = no regime, 1 = SAM− (annular), 2 = SAM+ / wave-4 A, 3 = SAM+ / wave-4 B, 4 = PSA-like. — Pohl & Fauchereau 2012 (J. Climate 25, 3336)