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\section{Introduction}  Reasearch conducted in several regions of the world have demonstrated a link between ENSO and fire activity \cite{Swetnam1983,Simard1985a,Kitzberger2002,Beckage2003,Carmona-Moreno2005,Nicholls2007a,Wooster2012, Harris2013}. The relationship is usually associated with a particular ENSO phase (El Niño or La Niña) and negative rainfall anomalies. These anomalies depend on the regional impact of ENSO over climate and are reflected in the rainfall deficits over the months before —and during– the wildfire season. This influence could be exacerbated if, for example, a strong El Nino event is in superposition with a negative Interdecadal Pacific Oscillation (IPO) phase \cite{A2004}.ENSO \cite{A2004}. ENSO  may even have an influence over ignition patterns, fostering the occurrence of lightning strikes \cite{Beckage2003}. Most of these studies also agree that there is potential to use ENSO to design seasonal wildfire indexes \cite{Simard1985a,Nicholls2007a,Wooster2012,Harris2013}. In fact, such an index has already been proposed for the Norhtern Patagonia region in Argentina \cite{Kitzberger2002}. \subsection{Study area} 
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