SetPos should not skip weather transitions
Take a scenic trip with the Silt Strider from Ald-Ruhn to Gnisis (you can increase the velocity in the options). Soon after Bal Isra the course pass through West Gash region and the Ashlands many times and the weather change immediately, from fogged to sand storms and back.
The same behavior can be observed with the Boats Mod with Tamriel Rebuilt. Take a trip from Sadrith Mora to Dagon Fel. The fast change between Azura Coast and TR regions create situations where in a moment is raining, after is fogged and raining again, in a couple of seconds, without transitions.
Linux Mint 18 64 bits 0.40.0+git201610202201~ubuntu16.04.1 (2016-10-20)
http://www.nexusmods.com/morrowind/mods/42267 (Silt Striders) http://www.nexusmods.com/morrowind/mods/42270 (Boats)
(RM-3603 from redmine: created on 2016-10-22 by Amenophis ., , closed on 2017-12-13 by Andrei Kortunov)