El Nino is so named because the effects of the warmer water off Peru are usually noticed near Christmas time.
El Nino is related to a winter holiday
( z1 relate :ARG1 ( z2 event :name ( z3 name :op "El" :op "Nino" ) ) :ARG2 ( z4 holiday :time ( z5 date-entity :season ( z6 winter ) ) ) )