[aerohead]

Originally Posted by 3-Wheeler

Hi AeroHead,

I know that I have mentioned this before, but the broadcast barometric pressure is not "the real barometric pressure".

The local TV stations and such always correct the "real" barometric pressure to sea-level, which makes the baro higher than it really is.

There is hope however.

Knowing your elevation, you can subtract the elevation above sea-level to get the "real" baro.

In Wisconsin where I live, the "standardized baro" is 30.00 inches or so on any given day, but the real baro is actually 1.00 inch Hg less than this, since our "average" elevation is 1000 feet above sea level, which lowers the baro by 1.00 inch Hg.

If you don't correct for this, your air density readings will be off by about 3.5%.

Jim.

Thanks Jim! I guess it's too much for people to just leave things alone for simple-minded people like me.
I hope they never begin to report temperature in degrees Kelvin.Folks will be afraid to walk out the door.