[storyr]

WeatherPanel beeps using a file in the windows directory called default.wav (I think that's the name). What I've done in the past was to take a copy of this file to my pc, open it in a sound editor - and decrease the volume (a lot). Copy the file back (using a tool that will do that for you) and it will sound nice and quiet. Or you can just remove it, I guess...

There's no way to turn the beep off via configuration, and some ROMS may not have this file.