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
BriefingTropics & oceansMJO & intraseasonal
BSISO1_PC1

BSISO1 PC1

Boreal summer intraseasonal oscillation (30–60 day), PC1 of the May–Oct multivariate EOF of OLR and U850 over 10°S–40°N, 40–160°E. Positive = convection over India/Bay of Bengal. — Lee et al. 2013 (Clim. Dyn. 40, 493)