La Nina's influence is currently helping the Western US, but a return to late Summer like conditions in the East. Is this due to Tropical activity in the Atlantic ? I notice that all the troughs as they migrate from west to east weaken as they become positively tilted. Is the Bermuda High stronger than what it should be for this time of the year ? Let me get this correct Is La Nina causing the Earth to warm and El Nino to cool because of cloud cover over the Tropical Pacific ?