Well, if the AI model was programmed with Euro data which has had a history of burying energy in the SW, weenie speculation says the AI model may erroneously tend toward that bias too.
I'll weenie myself to save others the trouble.
Fyi, 6z GEM is a crushing. It it only goes out to 84hrs like the Rgem, but it shows a lot of 10mm+ (.4") qpf had fallen as snow and still more heavy snow to go as shown on these 2 maps.
This is the link to all the AI products. The qpf/slp combo map is the 5th one down.
https://charts.ecmwf.int/?facets={"Product type"%3A["Experimental%3A AIFS"]%2C"Parameters"%3A[]%2C"Range"%3A[]%2C"Type"%3A[]}