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Yes.. this is the same US GFS model that Skippy Sky also presents data from. Use whichever interface you prefer, but the forecast data should be the same (also on just about every other weather website online as well.. they all use US GFS model).
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Phil - correct, however the individual websites do all interpret the GFS model slightly differently. I'm not sure of the details (do some use a finer/courser lat/long grid? Do some provide clever additional meteorological interpretation?). I suspect at least some of the variation may be for visualisation purposes (e.g. 7timer tries to make things look realistically like clouds).
Having never played with the 7timer one, I quite like the fact you can see (at a glance), how the last 4 model runs predict any specific time. i.e., it's interesting to see if the latest model run is much different from the one 18 hours ago.