Updated plotskew.gs routine

[Fil]

Thanks Robert, I'm glad you finally updated it! It's working fine and fast.

Anyone knows a formula to calculate dew point from GFS data? I'm using the
one from (http://www.saakeskus.fi/index.php?function=oth) but on some
coordinates, and depending on the GFS run, I'm getting the error
"Non-numeric args to numeric operation" in the following lines:

rec=GHBCAPE(sndtemp,snddewp,MAscentI*100,2,200,MAscentT)
val2=GHBgetqvi(p2,t2)
es = 611.2*math_exp(21.8745584*(t-273.15)/(t-7.66))

Cheers.
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