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METARs for ISA atmosphere?

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METARs for ISA atmosphere?

Postby Necolatis » Fri Mar 31, 2017 5:47 pm

I have been using "Fair Weather" for when testing aircraft in an ISA atmosphere, but that probably not fully correct, at least the temperature is 5 degrees off.

Does anyone have compiled some METARs that simulate ISA atmospheres for convenient flight testing?

The ones I am looking for is:
ISA
ISA +10
ISA -15
ISA -30


I can probably do some myself, but no reason to reinvent the wheel if someone else already has done it.
"Airplane travel is nature's way of making you look like your passport photo."
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Re: METARs for ISA atmosphere?

Postby Thorsten » Fri Mar 31, 2017 5:56 pm

Do not use any weather engine, and you'll get the standard atmosphere.
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Re: METARs for ISA atmosphere?

Postby Necolatis » Fri Mar 31, 2017 6:12 pm

Thanks did not know that, well that crosses off one from the list. :)
"Airplane travel is nature's way of making you look like your passport photo."
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Re: METARs for ISA atmosphere?

Postby Thorsten » Fri Mar 31, 2017 8:22 pm

The weather engines just utilize some more fundamental atmosphere code by pushing sea level temperatures and pressures which the atmosphere code then extrapolates.

(Side remark - that extrapolation is of course pretty bad meteorology, but so is the standard atmosphere).
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Re: METARs for ISA atmosphere?

Postby Necolatis » Sun Apr 02, 2017 10:58 am

Sorry for asking stupid, I tried to look up in the wiki how to disable weather engines, but failed to find anything.

How is that done?
"Airplane travel is nature's way of making you look like your passport photo."
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Re: METARs for ISA atmosphere?

Postby Necolatis » Sun Apr 02, 2017 11:57 am

also, for "ISA -15" would a metar like this do it, or do I need to change the pressure also? (if so then to what?)

--metar="XXXX 012345Z 15000KT 25SM 00/M10 Q1013.25 NOSIG"
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Re: METARs for ISA atmosphere?

Postby Necolatis » Wed Apr 05, 2017 3:40 pm

Okay, I got the answer to that now. ISA +X only changes the temperature, not the sealevel pressure.
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