Karen K <kk4468...@gmail.com> writes: > The wiki page Barometer, pressure, and altimeter > <https://github.com/weewx/weewx/wiki/Barometer,-pressure,-and-altimeter> > says, > that calculating the barometer value "requires the temperature 12 hours ago > in order to correct for diurnal tide effects." > > In contrary in the weewx.wxxtypes.PressureCooker.barometer() function the > actual temperature is used only. There is no database access. > > Could someone explain, what the reference to temperature 12 hours ago in > the wiki means?
My understanding is that the strict definition of "barometric pressure" is a reduction to sea level, starting with sea level, and using a time average of temperature. However, I suspect that in many cases it is done with current temp only. I have the impression that strictly one might need the future temp, but I am very unclear on that. Hope this helps if you try to chase down real definition (WMO, national weather agencies). -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/rmir0q1vuvd.fsf%40s1.lexort.com.
