NOAA GFS Weather for X-Plane...

[jcomm]

Most of you probably already know / use it.

 

It's a really nice app, available from here:

 

http://x-plane.joanpc.com/plugins/xpgfs-noaa-weather

 

 

You can set up to what level METAR information prevails. Above that altitude  / FL, NOAA GFS forecasts will be used to set winds, temperatures and turbulence aloft at various reference FLs.

[Ahmed]

For winds in flight-planning, you could check this http://aviationweather.gov/iffdp/

[jcomm]

Good site!

 

I also use skyvector.com - METAR, TAF, SIGMET available too.