windy-plugin-skewt – new features :)

[Gkikas LGPZ]

@johnckealy
Hi John!
You did a great job!
Please, if possible, add the temp. of the purple dot
so we could know the temp. ascent starts.
P.S. I like the old fashioned (traditional) background with the green lines!
It reminds me my first years in the job.

[Gkikas LGPZ]

....
hmmm
what's the temperature at 250 hPa ?
-42 or -44 C ?

Maybe the problem starts from this
https://community.windy.com/topic/7963/upper-air-temperatures

[Yves70]

@Gkikas-LGPZ
Did you see other discrepancies at other levels between temperatures of the sounding and the map ?

[Gkikas LGPZ]

@Yves70
No.
Please read the following post to the end.
https://community.windy.com/topic/7963/upper-air-temperatures

[Yves70]

Correlation seems to be good at other levels :

[rittels]

@johnckealy

Well done. Very cool.

The skewT overlaps the detail a bit, at least on my screen.

There is an error in the console:

Error: attribute d: Expected number, "MNaN,NaNLNaN,NaNL…".

[johnckealy]

Amazing feedback, thanks everyone!

@rittels, the skewT is overlapping the spot forecast? I'll look into that. Man I hate cross-browser incompatibility! The error you see isn't anything to worry about, been meaning to find a way to suppress it. It's just the data points in the ascent that I didn't want shown.

Thanks for the info on the temperature discrepancy too @Gkikas-LGPZ and @Yves70, I'll have a look into that for the next version.

[johnckealy]

Hi All,

windy-plugin-skewt now has a radiosonde feature. I'm still testing it, but please let me know any feedback :)

[Gkikas LGPZ]

@johnckealy
Wrong data for 250hPa (FL340).

It seems your plugin doesnt take into account data for 250 hPa (nor interpolate 300~200 hPa data).

Same problem found here https://community.windy.com/topic/7963/upper-air-temperatures
Also read https://community.windy.com/topic/13921/windy-plugin-skewt-new-features/5?_=1615067856664

[johnckealy]

Thanks for the feeback @Gkikas-LGPZ. Easy fix. Either I had originally missed it, or it was added by Windy later, but there is indeed a 250mb datapoint. All I had to do was add it in. You may need to give it a few hours to update, but I've published the change.

[EduardoSG]

Nice plugin !

It seems you have something wrong when calculating altitude related to pressure

[johnckealy]

Hey @EduardoSG

sorry if I'm being slow, but what's the issue?

z = -H * log(P/Po)

so 500 hPa should be around 7000 m, no?

[Gkikas LGPZ]

@johnckealy
500 hPa gph rarely observed higher than 6000m

[Yves70]

@johnckealy
John, 500hPa is about 5500m

[johnckealy]

@Yves70 @Gkikas-LGPZ

I just use the above equation in that calculation, it's just an estimate. Is there a better equation I can use? If not, suggestions on how to approach it? It's been a while since I did this stuff.

[Gkikas LGPZ]

@johnckealy
https://www.math24.net/barometric-formula
Also see "example1"

[vsinceac]

There is also this NOAA online calculator with corresponding formula.

[johnckealy]

Okay, added a fix for that in v0.9.2 🌨️🌞

[EduardoSG]

Hi @johnckealy

I found what I think can be a bug.
When I change models, the sounding displayed changes differently depending from which previous model I am changing to.

In my region I have ECMWF - GFS and ICON, in that order from left to right
When I go from any of the first two to ICON, it seems to repeat on of the previous two soundings
When I go from ICON to any of the previous two, it shows a different sounding (the same if I go from ICON to GFS or from ICON to ECMWF)

In total there are three soundings, but it is not clear which one corresponds to which model because of this glitches

I atach two screenshots

[johnckealy]

@EduardoSG

Sorry about that, I thought I'd fixed this already. Thanks for reporting the bug. I've just written a fix (v0.9.3).

Let me know if you still see problems.