Weather satellites have had microwave technology for a while now. It can plot winds speeds and direction on a general scale. For fine-tuned wind patterns on a local scale, we still take observations from different locations and plot the wind pattern by hand (or via mouse on a computer app). It might be harder to get an accurate closeup streamline picture for the PH because the whole country has like what, only 3 observing stations? I guess the satellite estimation is good enough.





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