The sequence of an enhanced El Nino In January, February and March warmth builds up in the western Pacific.
In April cool emerges in nino 5 and the warmth flows into nino 4.
In May cold water spreads eastward from nino 5 into western nino 4 as warm water approaches the western border of nino 3.4.
In June the cold water continues eastward into nino 4 and warm water settles into western nino 3.4.
In July cold water spreads into nino 4 bringing drought to N. Australia. Warm water spreads from the dateline towards Hawaii in a little understood sequence.
By August the eastward flowing warmth has spread through nino3.4 and is flowing eastward from Hawaii into nino 3. Nino 4 continues to cool off.
From September to November the eastward flow increases in warmth and volume flowing through nino3 into western nino 1+2. The cold water settles into place in nino4.
In December the cold pool maintains itself in the western Pacific as the warmth flows into nino 1+2 filling the eastern Pacific with unusually warm water. This pattern is then a strong el nino. The flowing of warmth from west to east in a yearly rhythm is known to climatologists as the canonical el nino. It is the canon or mean pattern for the phenomena supporting the climatology of el nino.
The whole phenomenon.
Read how Planetary Movement may be charted across the Pacific Ocean.