Atlantic seasonal hurricane frequency, Part I: El Nino and 30 mb Quasi-Biennial Oscillation influences.

Abstract

It is shown that a substantial negative correlation is typically present between the seasonal number of hurricanes, hurricane days and tropical storms, and moderate or strong (15 cases) El Ninos off the South American west coast. A similar negative anomaly in hurricane activity occurs when equatorial winds at 30 mb are from an easterly direction and/or are becoming more easterly with time during the hurricane season. This association of Atlantic hurricane activity with El Nino can also be made with the Southern Oscillation Index. -from Author