Neil Charles, an average weekend warrior PG pilot who likes building techy stuff. I mostly fly in the Pennines, or more accurately, I mostly look after my kids, muck about building apps and occasionally fly in the Pennines. You can contact me here.
I built the Wind at Altitude app to make it easy to see wind speed and direction at the altitudes where paragliders mostly fly. The app uses DWD ICON and NOAA GFS data from Open Meteo and caches data for one hour. If the app's cache is older than an hour then it requests a new forecast from Open Meteo (which may be unchanged because ICON and GFS don't refresh as frequently as hourly).
The Wind at Altitude app is designed primarily to avoid pilots being surprised by unexpectedly strong winds and wind direction changes above take-off altitude.
Yes. Look for the settings button on the right hand side and you can change a few settings there, including measurement units and calibrating the colour scale on the chart.
When you change settings they're stored in the page URL. If you set it up the way you like it and then create a bookmark, next time you visit the bookmark, the site will be set to your choice of units and your favourite hill etc.