NGM FOUS problems

I think this problem is only related to the beginning of the month tomorrow. When I download weather data with WXSIMATE, everything goes well. Tonight, when I downloaded the data, it worked fine, but when I imported the data in WXSIM, it “omitted the old data” of the 0z runs of the NGM FOUS, because they occured on May 1. My thinking is that WXSIM thought that the data was from April 1, not May 1.

Thoughts?