My Thunderstorm environmental issues under TESIV now appear to be resolved through the following actions:
1) Create custom plug-in, weather regions against all vanilla, world regions; if any existing world region is flagged as 100% and the box is checked for override, uncheck this box in favor of your mod.
2) Create player trigger zones for entry/exit portals for all cities and each area in which your quest narrative will take the Player.
3) To insure game stability against modified weather regions, add scripting to your main game script against all key, Player transition areas ( Player.GetDistance).
Thanks to everyone for all of your feedback in support of this forum discussion. This forum issue is now resolved and should be considered closed.
When the paradigm of knowledge increases is when true learning is experienced!
KWITS