With or without the presence of the mei-yu front, the eclipse path is embedded in a humid and unstable airmass from India to the Cook Islands.

Results using routine surface meteorological variables show that we can get airmass categories each having distinct feature and circulation pattern by the methodology.

Influenza is a year-round event in the tropics. If the tropical airmass around the Earth's equator expands, as new areas lose their seasons they may also begin to see influenza year-round.