What we are expecting for the first part of World ARC:

Equador to Galapagos:
Close to the South American mainland the winds are not well defined. Sometimes they blow from the south, up the coast, fanning out somewhere off the coast of Peru, flowing NE into the Gulf of Panama and NW into the Pacific. But these winds run into their counterparts coming down from North America. Where they meet is called the ITCZ (Inter-Tropical Convergence Zone) This usually means a band of cloudy, squally weather with fluky winds!

Things might even get chilly!
The cold Humboldt Current comes from Antarctica, up the coast of Chile and then spreads west into the Pacific just south of the equator. While water temperatures are typically 27°C in the Caribbean they can fall to 21°C en route to the Galapagos (temperatures we have not experienced since Las Palmas!)

The Humboldt Current is also responsible for cyclones in the South Pacific. The strong south equatorial current usually spreads the cooler water far to the west, preventing the high temperatures cyclones need to start. But if the Humboldt Current fails or is weak for some reason (an “El Niño year”) then the Pacific warms up much faster than usual and the cyclones can form more often and much further east. (fortunately for us this is typically May to November – after we have gone)

Galapagos to Marquesas:
Tradewinds in the Tropical South Pacific typically blow from the southeast or ESE, but they often don’t start until a few hundred miles or so west of the Galapagos.

Current Surface Wind Chart for Eastern Pacific:
East Pacific Weather Chart

Current Barometric Pressure Chart for Eastern Pacific:
Current Barometric Pressure Chart for Eastern Pacific

For weather forecast and animations of these charts Click Here
From the menu select “South Pacific” then “America to French Polynesia”

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