i guess the Romanian developers had a continental view of maritime weather...
Both the h.sie and Stiebler V16B1 patches are supposed to contain fixes to stop continuous storms (among other good things). In my experience they are not completely effective. These mods patch sh3.exe and also require manual editing of data files: they are really difficult to get working. I can recommend Onealex's version of GWX as he has done all the hard work for you.
A LOT more from h.sie and Stiebler here:
https://www.subsim.com/radioroom/sho...d.php?t=177507
Not much help mid patrol I'm afraid.
The SH3 weather is supposed to change every 20-40 hours. More frequently near the equator and less frequently in the arctic. I always found with GWX that restarting the game from a save restarted the weather timer, so locked in the existing weather for another 20-40 hours. Now in NYGM a restart seems to change the weather. I was running Stiebler V16B1 in both cases (although maybe without the same options selected...)