Am not sure it is GWX related, the weather system in SH3 has always been a concern.
Can't say more on this as I have not been in many places in GWX yet (in the Med so far had mostly nice weather), but my NYGM/SH3 Weather install is not too bad, I get frequent weather changes...
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NYGM 3.4A / Living SH3 V5.1 + SH3 Commander
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