Young Surfing Girl

East coasts also receive heavy winter swells when low-pressure cells form in the sub-tropics, where slow moving highs inhibits their movement. These lows produce a shorter fetch than polar fronts, however they can still generate heavy swells, since their slower movement increases the duration a particular wind direction. The variables fetch and duration both influence how long wind acts over a wave as it travels, since a wave reaching the end a fetch behaves as if the wind died.
During summer, heavy swells are generated when cyclones form in the tropics. Tropical cyclones form over warm seas, so their occurrence is influenced by El Niño & La Niña cycles. Their movements are unpredictable. They can move westward as in 1979, when Tropical Cyclone Kerry wandered for three weeks across the Coral Sea and into Queensland before dissipating.
Surf travel and some surf camps fer surfers access to remote, tropical locations, where tradewinds ensure fshore conditions. Since winter swells are generated by mid-latitude cyclones, their regularity coincides with the passage these lows. Swells arrive in pulses, each lasting for a couple days, with a few days between each swell.