On Monday, February 9, 2015 at 10:06:18 PM UTC-8, wrote:
It seems to be related to the GFS 0.25 degree upgrade that happened mid-January, the forecasts have been rubbish ever since. Stick to RASP.

I have found that XC Skies is VERY good for cloud cover, bases and winds, but is usually overly optimistic when it comes to "top of usable lift" and thermal strength. For that info I use Dr. Jack.