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Geopotential height and streamline forecast

 HKO: relative humidity and streamline

HKO has actual ( now) and future 72 hours of forecast

Weatheronline expert charts: streamline 500 hPA

several forecast model, eg GFS, ECMWF, ICON, etc are available


WeatherOnLine has previous four days and future 384 hours 

WxCharts:
500 hPA Geopotential height

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