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Wxcharts shows forecast plus nowcast. The 300hPa wind speed is the jetstream. E.g. http://wxcharts.eu/?panel=default&model=gfs,gfs,gfs,gfs®ion=euratl&chart=wind300kt,850temp,snowdepth,snowdepth&run=00&step=006&plottype=4&lat=51.500&lon=-0.250&skewtstep=0
what is a good source for a live jet stream map
or even a regularly updated one