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Welcome to the Boreal Summer Intraseasonal Oscillation (BSISO) forecast website. The BSISO forecast activity has been initiated in 2013 with the goal of improving our ability to understand and forecast the BSISO based on numerical models in cooperation with the CAS/WCRP Working Group on Numerical Experimentation (WGNE) Madden Julian Oscillation (MJO) Task Force, and hosted at the APEC Climate Center (APCC). 


This website will be updated as additional models become available and verification statistics and various ways of displaying forecast information generated. The information is available from May to October.


Below is link to the MJO model forecasts.

Operational Realtime Dynamical Model MJO Forecasts 

Phase Diagram

A key for the label headings in the figure box is provided below.
Note: Move cursor over product name to display. Click for additional information

Phase Plots of BSISO Index Forecasts


Spatial OLR Anomalies


Heavy Rainfall Probability



Real-time verification for BSISO indices


Forecast skills of BSISO indices for all available days from 2013


BOM: Australian Bureau of Meteorology - POAMA 2.4 multi-week model 

CFS: National Centers for Environmental Prediction - Climate Forecast System

GFS: National Centers for Environmental Prediction - Global Forecast System

ECM: European Center for Medium Range Weather Forecasts - Ensemble prediction system

CWB: Taiwan's Central Weather Bureau - Global Ensemble Prediction System