Android Skew-t app

On Thursday, April 17, 2014 3:48:35 PM UTC-6, JS wrote:
Alan, you must be having fun with this!

Thanks,

Jim

Yip!!!

I've talked to a number of people from all over the world and everybody has helped to make this a better app for soaring. I have also learnt LOTS AND LOTS about Skew-t graphs and data.

Unfortunately I think my ride is coming to an end as it already does most things people have asked for.

Enjoy
Alan

On Thursday, March 27, 2014 at 11:25:32 AM UTC-5, kiwiindenver wrote:
Hi All,

As a recently licensed pilot I decided it would be a good idea to learn more about soaring weather prediction, specifically the workings of a Skew-t graph.

I combined that with learning more about developing Apps for Android, so yesterday I published by first Android App.

https://play.google.com/store/apps/d...=com.ajw.skewt

I hope many of you find this useful.

I welcome your suggestions for improvements. As I said, this is new to me.

Enjoy.

Alan

Alan, I just came across this app and am trying to learn how to use it. I get the temp and dewpoint lines. But what does the green line intersecting a gray line with the dark marker at the intersection mean? And what does moving the spot marker off of the temp line accomplish? It defines a grayed area in sort of a triangle but I haven't figured out what it's telling me..

Ray
Commercial/instrument single-engine land

On Wednesday, January 24, 2018 at 1:51:47 PM UTC-7, wrote:
But what does the green line intersecting a gray line with the dark marker at the intersection mean?

The green line is of great interest to glider pilots because it represents a bubble of air warmed by the sun hitting the ground. Once the bubble breaks away from the surface it starts to cool. The green line represents the temperature of the air as it rises. As long as the green line in to the right of the red line, the bubble will continue to rise. The red line of course represents the temperature of the ambient air as you go up in altitude. Where the green line crosses the red line the bubble is the same temperature as the ambient air at that altitude. So buoyancy is neutral. But the rising bubble has mass, so it has momentum and that carries it above the altitude of the crossing point.

So the rising bubble of air is followed by another rising bubble of air and that creates what we call a thermal or an updraft. If you're a glider pilot you can climb until the bubble stops rising. If you're a power pilot you will experience turbulence below the altitude where the bubble stops rising.

Now this bubble started out at surface air with a specific dewpoint when it was at the surface. This dewpoint is where the blue line intersects the ground. The dark grey line shows the dewpoint of the bubble as it rises. Where it intersects the green line, the temperature of the bubble at that altitude equals it's dewpoint. A cloud forms. The little horizontal dash marks the cloudbase. There is a corresponding dash on the altitude scale to the right, so that you can read an altitude number off the scale.


And what does moving the spot marker off of the temp line accomplish? It defines a grayed area in sort of a triangle but I haven't figured out what it's telling me.

The only grey area that I see is on the wind speed vs. altitude graph to the right of the skew-t. Dragging the cloudbash hashmark just pans the skew-t I think.

I have a question that many may be able to answer.
I fly from Middletown, NY. ID is K06N.
When I load this in the app, it comes back with no data. Does the app find the closest sounding (we don't generate one) or do I need to find the closest sounding and Input that ID?

I also appreciate some of the links to, "reading a skew-T chart", thanks. It's been a while for me, nice to have a refresher.

On Saturday, January 27, 2018 at 11:19:46 AM UTC-5, Charlie M. (UH & 002 owner/pilot) wrote:
I have a question that many may be able to answer.
I fly from Middletown, NY. ID is K06N.
When I load this in the app, it comes back with no data. Does the app find the closest sounding (we don't generate one) or do I need to find the closest sounding and Input that ID?

Try SWF.

The app does not seem to have data for smaller airports. For the Boston area, 3B3 comes up "no data" but both ORH and FIT are good.

...david

Hi, This is my app, im glad to hear people are still using it.

Technically my skewt app doesnt have any airports. I send the airport code to the noaa server and it gives me data if it can.

The best option if the airport is not found is to use lat/long coordinates. You can also pick from the map.

Alan

It's a very nice little app that sometimes doesn't succeed in obtaining data to display. I have used it often.

Great suggestion, thanks, now I have data and can mess with it.

Le jeudi 27 mars 2014 12:25:32 UTC-4, kiwiindenver a écritÂ*:
Hi All,

As a recently licensed pilot I decided it would be a good idea to learn more about soaring weather prediction, specifically the workings of a Skew-t graph.

I combined that with learning more about developing Apps for Android, so yesterday I published by first Android App.

https://play.google.com/store/apps/d...=com.ajw.skewt

I hope many of you find this useful.

I welcome your suggestions for improvements. As I said, this is new to me.

Enjoy.

Alan

Bonjour

Best text to learn to read Skew-T is on the web.

Skew-T's- How to read them.
By Jim Martin
Finger Lakes Soaring Clubs
Danville NY - 2015

Gilles

On Thursday, January 25, 2018 at 7:10:03 AM UTC-6, wrote:
Le jeudi 27 mars 2014 12:25:32 UTC-4, kiwiindenver a écritÂ*:
Hi All,

As a recently licensed pilot I decided it would be a good idea to learn more about soaring weather prediction, specifically the workings of a Skew-t graph.

I combined that with learning more about developing Apps for Android, so yesterday I published by first Android App.

https://play.google.com/store/apps/d...=com.ajw.skewt

I hope many of you find this useful.

I welcome your suggestions for improvements. As I said, this is new to me.

Enjoy.

Alan

Bonjour

Best text to learn to read Skew-T is on the web.

Skew-T's- How to read them.
By Jim Martin
Finger Lakes Soaring Clubs
Danville NY - 2015

Gilles

Thanks for the explanation, Gilles, and the quick response. I'm a motorized pilot and not familiar with what glider drivers look for and couldn't figure out the significance of that line. Now I know.

Ray