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in the wind airgram picture...

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ag45 last edited by

... what is the meaning of the lines labelled in "xxxh" ?
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Gkikas LGPZ Moderator last edited by

Pressure in hPa (hectoPascal).
The "standard" pressure on the surface (sea level) is 1013 hPa.
As we go up, the pressure falls.
So, at 850 hPa we are at elevation of 1500m (5.000 ft)
at 500 hPa, 18.000 ft etc
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