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paolov:FYI : due to the Coriolis effect. wind patterns are predictable and hence typhoons take on the general predictable paths. other factors would be the density of water vapor and the high and low pressure areas near the weather disturbance.
due to the Coriolis you may expect typhoons to be moving northward as they approach the Philippines. this is so due to the rotation of the earth.
to see how fast the earth rotates : determine the equatorial circumference of the earth =Ce (in kilometers) = 40,076 Km
Ce dived by 24 hours = km/hour
40,076Km / 24hr = 1,669.83 Km/hr
that is how fast the earth rotates at the equator hence the Coriiolis effect and Trade winds.
but you don't feel it huh...
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wow...very scientific!