January, February, and March (JFM) storm track frequency binned into 5x5 degree grid boxes composited by ENSO phase. Composites are calculated using the Oceanic Nino Index (ONI) defined as the three mont h running mean of SST anomalies for the NINO 3.4 region.

Average JFM storm track frequency difference for (top panel) strong El Nino (ONI greater than or equal to 1.5) minus Neutral conditions and (bottom panel) strong La Nina (ONI less than or equal to -1.5) minus Neutral conditions.