Unfortunately, last couple of days their accuracy dropped significantly.
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Did you considered a trial period or publishing your forecasts at the day end just to verify with reality?
I dont believe it dropped in last days
. Luckily for human kind,all weather forecasts remain to be occasionally faulty for next decades. For the purposes of long distance flights and competition flying it is rather useful to understand their sources of error and develop some personal sense of the flaws of each. fcst24.com is essentially a RASP system, with some improvements in high resolution ground data and high definition viewing. It is not going better by verifying it, as most of error is from US based systems (like RASP and other GFS-based products) from known sources, for European systems from other knwon sources - mostly soil moisture data. So it is rather knowing the error margins and logic that helps to navigate in those data.
If to log into, but do not pay, then user can access freely maps in topmeteo/RASP like general view. Paid users can go deeper in detail and change calculation parameters, then maps are, contrary to other services, recalculated on the fly for them. Leaving this free would hog up my servers, as every time if user changes glider LD or minimum altitude of flight for PFD, XC-speed maps are calculated again for those parameters.
For 1000km flight planning it might be useful to draw the path on map and see variables (XC speed, tailwind, Cloudbase) changing over time.
It may take some time to get used to it, as for example the XC-Speed and PFD are deliberately organized to represent physical fields, not classification results. So most of use is to look the dynamics of the pattern early in morning and then match it with sat24.com or visible sky, to adjust the patterns to reality. Competitions have other types of use of very high resoultion simulation , for example, attached picture shows 1km resolution simulation for Leszno area (today, 20.06 1340LCL) , pattern of micture of thermals, convergences and rains. Not that it would be exact, but as a pattern its logic matching nearby reality.
