The WeMOi barometric pattern is believed by some climatologists to be causally related to, and thus partially predictive of, rainfall variability on the eastern side of the Iberian Peninsula. A Positive phase of the WeMOi typically shows an anticyclone in the Gulf of Cádiz area and a low-pressure area by the Ligurian Sea whereas a Negative WeMOi phase will show a Low in the Gulf of Cádiz and an anticyclone in Central Europe.
