Upper air temperatures
Upper air temp. on the map is not the same as on sounding.
Temp. at 250 hPa (FL340) is -56C (confirmed by official prognostic chart).
Sounding shows temp. at FL340 is -59C.(wrong).
The cause is that sounding uses interpolated values from 300 hPa and 200 hPa.
for better results you must, also, take into account values at 250 hPa (its a standard level).
Also, keep in mind that tropopause usually lies at these levels
so you cannot interpolate temperatures as tropopause is a discontinuity surface.
.... official chart confirms that temperature at FL340 over NW Greece is -56C
I thought that the blue curve (and blue figure) was the dew point and the red curve the temperature shown by the dry thermometer. But may be I’m wrong, being not familiar with atmosphere soundings.
Gkikas LGPZ last edited by Gkikas LGPZ
Yes! You're right. Red curve and numbers stand for temperature.
But, the problem I mentioned still exists!
(confirmed temp. at 250 hPa = -56C. Sounding temp. -53C).
... the straight line from (A) to (B) shows that no other level (from 300 hPa to 200 hPa) is taken into account.
TZ last edited by
@Gkikas-LGPZ Thank you for investigation. Yes, it seems that the 250hPa layer is missing in sounding. I will look at it.