The Bureau Of Meteorology today announced a La Nina Watch was in effect. A La Nina Watch is issued when there is a 50% or more chance of a La Nina forming. The image below shows that all modelling is tipping a cooler than neutral pattern developing by November.
A La Nina is commonly associated with above average rainfall across Northern Australia, an early onset to the storm season, an early onset to the North Australian Monsoon and above average cyclonic activity.
A La Nina in the north during Spring/Summer is also associated with cooler daytime temperatures and warmer night time temperatures as increased moisture causes greater cloud cover. It is important to note that all La Nina events are unique in terms of their effects. A La Nina is not a ticket to widespread flooding rains everywhere, it merely increases the chances of widespread rainfall occurring.
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