Posts made by johnckealy

Many thanks to @andrestotorica for sending me a PR for windy-plugin-skewt. I think it's working now, I'll try to find some time at some point to properly look it over. I also need to remove the sonde observations as I'm not running the server that processes them anymore.

Hi all, Yes I'm sorry i've had little to no time to keep maintaining the plugin when windy updates break it. Should be working again for now. @ianwightman what green line? All of the background thermodynamic lines are green. Parcel ascents are red.

@rittels Before I spend all day digging into this, do we know what broke everything? An update to Windy, or Leaflet or something?

@shashighedia

The red line is a parcel ascent. Drag the purple slider to the right, and this will change. The concept is that as the surface temperature increases, the energy of a rising parcel of also increases (known as CAPE). By comparing the red curve with the existing temperature profile, you can diagnose the instability (likelihood of showers, thunderstorms etc) of the atmosphere. In theory, you can even use this to predict the exact onset times of convective clouds, or even afternoon thunderstorms. Just google "radiosonde parcel ascent", "convective available potential energy", or "lifted index" to get started.

@ken I wrote SkewT. However, other work has kept me from giving it the love it needs, so I might have to suggest you look at the RadioSonde plugin instead. It's newer, and probably a little more reliable.

Feel free to give me more details in case I can find some time for it though, as I cannot reproduce exactly what you mean.

@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.

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

@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.

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?

Wow.... Amazing work guys!

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.

Hi All,

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

@matt590

Hi, glad you're making use of the plugin :)

That's bug I've been meaning to get to... My suspicion at the moment is that it's actually just the way the javascript interprets where the "point" of the mouse pointer actually is. I'll try to get a fix in soon. In the meantime, try interpreting the "point" as being in the center of the mouse pointer.

Not ideal, for sure, but as I say will try to get a fix in soon. Hoping it's nothing more serious than that...

@gmahan3

Have a read of https://github.com/johnckealy/windy-plugin-skewt and https://en.wikipedia.org/wiki/Skew-T_log-P_diagram to start. Skewing the isolines helps clarity, and adding the other lines allows the calculation of a sh*t ton of other thermodynamic quantities. My latest update also allow you to play with parcel ascents (drag the purple dot at the bottom). That will tell you a lot about stability and thunderstorm potential. You can get cloud info, wind shear, instability.... actually now that I think of it, I wrote an article on this a while back:
https://community.windy.com/topic/13267/unlocking-the-upper-atmosphere-an-introduction-to-the-skewt?_=1607459144415

It can take a little time to get to grips with SkewTs, but for a pilot, it's probably well worth the time. Just google around, there's tons of info about skewTs on the web for beginners. Also google "tephigrams", which may be more relevant depending on your location.

Let me know if you have specific questions :)

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.

@Yves70, awesome, thanks for that. Guess I never really open it that way! I'll look into it, sounds very fixable :)

Hi all, (@Gkikas-LGPZ @vicb @rittels @stitch @yves @jacobsjo @marekd )

I did a big update of windy-plugin-skewt over the weekend, was wondering if you'd like to check it out. You can now move the purple slider at the surface temperature to get a parcel ascent. Also, it's now possible to open the skewT and spot forecast simultaneously.

Would really appreciate any feedback or bug reports!

Thanks for the info all, I've added a patch for SkewT :)

I was tidying up some long-standing bugs with windy-plugin-skewt this week, and I got a request from @stitch to try to keep the SkewT alive when the spot forecast opens. I see that most of the HMTL elements go to "display: none" by default; is there any way to override this behaviour and keep the plugin open?

I assume you're talking about @vicb 's plugin. He would need to add that feature manually, so it'll be up to him whether that's worth doing :)