I think it's typhoon wind. We were just out tonight watching the low clouds get sucked down the coast, very quickly. Meanwhile, we have winds coming down the 'river' (large creek) valley behind us. It seems to be a pressure thing going on. The winds are now increasingly from the north, and we're getting more clouds and a little rain.

That's what i was wondering - is it the wind being sucked into the low pressure or cyclonic wind generated out - i think you are right, it's probably the wind rushing in.

Nanmadol - weird name - sounds like an anti-depression drug.