Hmm, sorry, looks like the link has been changed into something different.
Please see attached screenshot from charts.ecmwf.int
There you can find those 10hPa-charts for the next 360hrs
Don't know, if this source has been posted, yet. But there is some open source for ECMFW ensemble forecast for at least the 10hPa level:
ECMWF | Charts
CHARTS.ECMWF.INT