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Temperature At Altitudes

Old 11-02-2012, 11:33 AM
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Default Temperature At Altitudes

Hi folks, I am new to the forum and just joined cause I noticed the depth of aviation knowledge here.

I have a question.
YEARS ago I used to fly right seat with a grizzly old retired Air Force pilot and he had the easiest way in the world to guess temperature at different altitudes. And he was usually pretty close. I have been trying to remember his little method for weeks now and I can't remember it to save my life!

It was real simple, any ideas?
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Old 11-02-2012, 11:47 AM
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I usually look at the screen in front of me

In all seriousness it's pretty difficult without looking at maps or knowing weather systems in the area. Inversions can put a damper in accurate predictions.

If it's a nice day just subtract 2 degrees/thousand feet from the ground temperature and it should be pretty close
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Old 11-02-2012, 11:51 AM
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Flight level times 2, subtract from 15 will give you the ISA temp (roughly) for that altitude.

Example: FL 200 x 2 = 40 15-40= -25
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Old 11-06-2012, 05:04 AM
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Thanks guys, I appreciate it!
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Old 11-09-2012, 11:09 AM
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Standard lapse, 2 degrees per thousand feet, start at 15 and subtract from there.
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Old 11-09-2012, 06:22 PM
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There was a special warning today in Alaska for a mass of air colder than -65c aloft
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Old 12-04-2012, 06:36 AM
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Originally Posted by JamesNoBrakes View Post
There was a special warning today in Alaska for a mass of air colder than -65c aloft
I have seen as low as -75C. That was up at 510, but still cold!
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