I am a glider(sailplane) pilot Flying from Lake Keepit A/F which is about 250 km north of Sydney NSW Australia. There are about 4 clubs operating in this general area over several hundred Kms. About a quarter of Australias glider pilots operate in this area.
My club is primarily interested in cross country flying over what would be called largely fairly dry flat agricultural land.
Windy appears to be a useful addition to the advice we currently access. A question. Do the heights displayed such as thermal height relate to height above land at that point or above sea level? As an example, if thermals are predicted to go to 2,000 metres and ground is 1,000 metres above sea level does this mean thermals will reach 1,000 ft above ground. A huge difference for us spoilt Australian pilots. !,000 m ( about 3,200 ft.) pretty marginal except for what we would call short, mostly local flying but 2,000m (6.600 ft.) one could be expected to fly 500 km on a summers day.
Best Wishes, Harry Medlicott