My experience over the years has been they all predict the generation and (generally) eastward drift of medium and high cloud really well.
Southeasterly onshore winds during the very humid SE QLD summer months are a roll of the dice, but ACCESS seems to have better resolution and modelling.
Agree will be interesting to see how they compare, so wise to have easier A/B swapping between GFS and ACCESS on the new site. The best situation for any extended upcoming astro session would be clear across the board for all available forecasts for sure.
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