This system was originally termed the Pacifica Monsoon cycle, but the overall mechanism affects rainfall throughout Poseidon. The Southern Hope Chain and Arc of Fire are part of a distinct seasonal cycle, the Twilight Polar Stream. The overall features of the system are modified by local factors.
There are three identifiable periods in the Pacifica seasonal rains. The seasons were first researched by inhabitants of the Pacifica Archipelago, and have a bias toward their observations and the Southern Hemisphere.
Pacifica Wet Season: Northern spring-sum-mer/southern autumn-winter
This time is frequently referred to as monsoon season. The origins of the major rains lie in the Challenger Deep, in the gap between the Endeavor Islands and Darwin's Archipelago. During the northern summer, most pressure systems collide with aridity systems, draining them of energy. With autumn comes a shift in winds. Southern systems gain energy and move on a more westerly track.
Pacifica Storm Season: Northern autumn-early spring/southern spring-early autumn
This is the most chaotic period of the cycle. Shifting winds bring large variations in weather through Darwin's Archipelago, and some of the heaviest rainfall all year for the Endeavor Islands occurs as energetic cyclones spin northward into them. The aridity systems to the west of the Endeavor Islands show more instability at this time of year, as do the systems in the anticyclone belt north of them.
With this chaos come some of the most powerful cyclonic storms in the Southern Hemisphere. Moving along Poseidon's Reach, these storms can cause huge amounts of rainfall and damage to the Pacifica Archipelago. Some manage to feed systems in the Northern Hemisphere, giving new life and strength to cyclones there.
Along the eastern side of the Pacifica Archipelago, this season is marked by wet, stormy weather. The western side receives rain mainly from systems that make it through the archipelago. This season can also cause the upwelling to the west to drift northward, causing a boom in fishing around Neptune's Cluster and the Sierra Nueva.
Pacifica Dry Season: Northern late summer-early autumn/southern late winter-early spring
During this relatively short period, a chaotic series of storms can bring large amounts of rainfall to New Hawaii and other northern regions. These storms are marked by great irregularity, and there are multiannual cycles of varying activity.
Occasionally these storms wander into the Southern Hemisphere, but this is relatively rare.
The same period in the Southern Hemisphere brings a relatively dry season to the Pacifica Archipelago. Milder, cooler weather springs from the western side, and storms still bring rains throughout, but the activity is generally lessened. There are small-scale, regional variations, depending on airflow patterns.
During this period, Darwin's Archipelago receives relatively little rain. Most of the westerly storms hit the southern end of the Endeavor Islands, moving in a generally northwesterly curve. These intersect with the aridity system west of Endeavor Islands. The rest of the Endeavor Islands receive a fairly steady amount of rain, varying mainly in the constant cyclonic activity tracking across the New Pacific.
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