Thanks to DIBO and galaxy flyer for posting the weathers. I should have thought to go and look at ASN!
My marked up version of the radar plot now shows the heading of PAT25 at the first and penultimate sweep, based on the ground track as measured directly from the plot and assuming that the wind is at the non-gust value from the METAR observation taken just 4 minutes later (making this a reasonable minimum drift). It also shows the 40 degree field of view of the AN/AVS-9 NVG, drawn assuming both pilots are looking directly ahead along aircraft centreline.
The take-away is that with these assumptions, the CRJ starts on the extreme left hand edge of the NVG field of view and then moves just out of it. The PAT25 pilots would only see the CRJ in NVG if they turned their heads left of aircraft centreline to search for it. Since they thought they had visual contact, presumably with AAL3130, they would have no reason to do so.
