Multivariate QBO Index

The multivariate QBO index (MQI) is a method of monitoring the interannual oscillation in equatorial stratospheric zonal winds. The MQI employs two EOFs that together describe 95.4% of the variance in the winds.


MQI phase space. The annotation on the plot indicates the pressure level of the relevant wind extrema (e.g. W50 is a westerly wind max at 50mb).




30mb standardized wind forecast. The forecast is derived from the behavior of past cycles at the current phase. The past cycles plotted are color coded by similarity.




Time-height section of observed and forecast winds.