On 1 Apr 2005 13:56:42 -0500, Roy Smith wrote:

0.5 inches is a HUGE altimter setting change. Are you sure about
that?

I have to agree with Roy here.

I just finished coming back from Ohio to Mississippi, and I experienced a
very large altimeter setting adjustments in my journey southbound north of
Bowling Green KY, but I sure did not experience .50 inches adjustments en
route. I did end up .25 inch less over the whole trip though.

If I remember correctly on one ATC hand off, I went from 29.96 to 29.88
which lowered my altitude by 80 feet. This really alarmed me as I sure
don't like deviating more then 20 feet from assigned altitude. Needless to
say, I made a quick climb to my assigned altitude!

There was a rather steep pressure gradient even in my trip I just did this
week, but as Roy says, .5 inch altimeter change in a flight range distance
in planes I fly is probably indicative of weather I wouldn't / shouldn't be
flying in anyway.

Allen