That is a bit longer than normal... There are possible other issues causing you trouble, but you can try a Ctrl-N key combo, which is supposedly an undocumented "weather re-set". All it does though, is re-set the random number and timer to do another possible weather change. Sometimes it works, sometimes it doesn't... You do have to give it another five hours game time though, and again, not using too much Time Compression. SH3 used to get wonky over 256, and SH4 seems to be 1024, but it does seem to be a bit hardware dependent. The better the computer efficiency, ~sometimes~ the higher you can go...
btw - your path does look fine, as does the mod list. Thank you for that.