On Oct 21, 7:17 pm, Terence Wilson wrote:
On Sun, 21 Oct 2007 20:06:30 -0400, "An Aviator"

wrote:
Current temperature is not used to convert
pressure to altimeter settings.

Can you please elucidate? Isn't current temperature implicitly used if
we use a barometer to measure local pressure and then extrapolate the
pressure at sea level (to be used in the Kollsman window)?

The altimeter will read correctly at the place where the baro setting
was determined.

Above that, all bets are off! All those factors affect the lapse
rate.

And it's surprising how far it can be off.

Bill Hale