Just a update. I was able to fly the 737-NGX with the following settings today and didnt have any s-turn issues. Use everything I posted previously but change the following. Uncheck the box that says disable turbulence and thermal effects near aircraft in FS Weather. Change the winds value from 3-2 to 1-1 in the FSUIPC Winds section on left side. Depending on how sensitive the 737-NGX is this might work and at the very least with these settings you have smoothing and turbulence isn't totally eliminated. I know it wont work with the 747-400 as she is a very finicky beat and the worst with the S-turn so if you flying her make sure this box checked. I did a 4 hour flight from Dubai down to Male Atolls with the above settings and didn't experience any S-turning. Hopefully I will catch a nasty storm soon and can test it further.

Just an update on my experience. Flying in a 150knt crosswind now from Sao Paulo to the south and no S-turns with the settings posted by Paul Deemer on page 1. Thanks for sharing those :)

There's a way to get this working without disabling turbulence... I'll post something about the settings I'm using (which I got from a user here)

Where/when?

Where/when?It continues at the link below http://forum.avsim.net/topic/346862-my-new-weather-config-works-perfect-with-the-ngx/page__hl__work+perfect__fromsearch__1