Upper-Level Heights

[KL13470]

Are there plans to add upper-level height overlays? Such as the 500mb decameter heights. I know a lot of times forecasters use the 528 decameter line to get a rough idea of snow potential, so this might be a useful tool to have, heights with a slider bar to adjust the level of the atmosphere you want to look at.

[Gkikas LGPZ]

@kl13470
With the "height slider", select 500hPa,
then "More layers..."

[Gkikas LGPZ]

.......
scroll down to "Display isolines" and click "Geopot. height"

[idefix37]

@kl13470
May I add that Windy shows Geopotential heights in meters whereas they are usually shown in decameters (dam).
As shown above by @Gkikas-LGPZ, the 528dam is the 5280m isoline.

[Gkikas LGPZ]

@KL13470
Yes, back in the good old times when (we) forecasters
had only a surface and a 500 mbs forecast chart,
we use the 528 isoline to forecast snow
(or we use some other practical rules)
but now, thanks to weather models, we have snow forecast maps.
https://www.windy.com/-Show---add-more-layers/overlays?500h,snowAccu,next3d,47.249,-70.225,4
Weather models forecast snow by using a lot of parameters,

P.S. if you have time, read this https://community.windy.com/topic/7239/snow-forecast-using-sounding-forecast?=1642089339722
and this
https://community.windy.com/topic/4513/what-elevation-for-spot-forecasts/9?=1642089339730

[KL13470]

@gkikas-lgpz Thank you so much! I've been using Windy for years now and never even noticed this function

[idefix37]

@gkikas-lgpz
Hi, it is a pity that Windy never made the temperature correction that you were proposing in your link.
It would bring a better accuracy for temperature and rain/snow limit in mountains.

[Gkikas LGPZ]

@idefix37
I think you talk about
https://community.windy.com/topic/4513/what-elevation-for-spot-forecasts/8?=1642077914502
and
https://community.windy.com/topic/3643/clouds-bases/10?=1642089339741

[idefix37]

@gkikas-lgpz
Yes you are right, these are the useful links.

[Chris Cowan]

@Gkikas-LGPZ I'm new to this and having a hell of a time trying to get upper level charts. I found isolines that were moveable a few days ago but can't find them now... down at the very bottom of the menu I can toggle between lines of geopot height and pressure but can't change the geopotential height.... there was a slider bar but now I can't find it or remember where it was...

[Chris Cowan]

@Chris-Cowan ...sorry found it... had to click on the airplane icon... I suppose it should be obviious,, but it wasn't.

[Gkikas LGPZ]

@Chris-Cowan
Yes, you need an airplane to go to upper levels! 😃