@graham2941 Weather radars provide images of instant rainfall. If you gather images during the last hour, it will give you a sort of video of the last rainfall during this hour. A weather radar can NEVER provide predictive images. Same as your camera can take pictures or video but never shows images of the future. Weather website or App showing so called « future radar » show an extrapolation of the last radar image applied during the next hour. If a new rain zone appears during this time you will not see it. However there are some high resolution weather models which are able to provide rainfall forecasts that look like a radar image. This not radar but just an avatar of radar.