The northern hemisphere signal is both larger and more robust than the Southern Oscillation aspects of the signal. Dominated by a few early events. Most prevalent pre-1976. Many events show composite behavior. Details vary with location and timing.
Most events show composite behavior.
Occurs frequently in non-ENSO periods. Many events show composite behavior. Details vary in location and timing. Most events show composite behavior. Occurs infrequently in non-ENSO periods.