[ahaseurus2000]

Weather data is contained in the campaign_???.mis files in the campaign folder.

it goes something like this:

...
fog=?
fograndom=?
clouds=?
cloudsrandom=?
rain=?
rainrandom=?
wind=?
winddirection=?
windrandom=?
...
WeatherInterval=7?

set all the values to "0" and you'll have sunny, calm seas with high visibility. I prefer fog set to medium (2) which allows me to sneak up on convoys while surfaced.

WeatherInterval sets how many hours must pass before the weather can change. I think the highest setting is "72", meaning three days.

I find weather still changes even with all the randoms set to zero. SH3Weather doesn't alter the randoms.

finally return to port before changing these files. and have the same settings in each file to lower the risk of errors.