Re: GFS. Easy way to tell in 90% of cases is, if the solution involves a ULL trapped underneath a horseshoe of ridging, it’s probably typical GFS goofiness.
If it’s a clean ridge without a trapped ULL, it’s much more likely to be a legitimate outcome. Of course neither case is 100% certain/foolproof.
12Z GFS wants to put snow down again over Central and Western Nebraska next Wednesday. I would usually disregard this in April, but last weekend's system overperformed here and we have had snowstorms in April during the last decade. Will never turn down more moisture.