Don't forget to click on the bottom-left button and check the different options.
Example of a high altitude with temperature:
http://earth.nullschool.net/#current/wind/isobaric/10hPa/ove...
And many different projections, Stereographic is awesome:
http://earth.nullschool.net/#current/wind/surface/level/over...
http://earth.nullschool.net/#current/wind/isobaric/1000hPa/o...
Please someone make this as an app for a desktop background!
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I found this option for total cloud water[0] and the checked the weather in France[1]. Pretty useful.
[0]:http://earth.nullschool.net/#current/wind/isobaric/1000hPa/o...