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Crumpp I really don't think that anyone uses the current weather readings to set it, with the possible exception being the military (don't know). Your eyes and instincts kind of take over at a distance above and close to the runway when it is seen well...your not watching the gauge to countdown to the setting its at
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You most certainly do reset your altimeter to the current settings before you take off and it does change while enroute. It is the very first thing ATC will give you at the hand off after radar contact.
It is absolutely essential to safe flight.