Here's an excerpt from the readme.
Storms & Sound 3.0
by Deathless Aphrodite and lilith
COMPATIBLE WITH OFFICIAL 1.2 PATCH AND SHIVERING ISLES
NEW VERSION:
+ Full inside sounds added to Shivering Isles too (thanks lilith!).
+ New options to enable/disable all visual and sound effects added by the mod.
+ New Obse version compatible with all past and future weather mods, including All Natural.
+ New non-Obse versions for compatibility with Arthur's natural weather and Enhanced weather.
+ Some small bug fixes and tweaks.
WHAT THIS MOD DOES:
The mod has a version for Vanilla weather, one for AWS, one for NW, one for Arthur's NW and one for Enhanced Weather.
There's also an Obse version which works with any weather mod, and my advice is to use this one. There's no reason not to use Obse, really.
Basically I merged the "Weather Inside" mod by vine and Morbus and the "Better Storms & Weather" mod by PsychEroc, adding many tweaks and features. The latter seems to have left the scene, so I couldn't ask for his permission.
Besides merging the two mods I tried to optimise the scripts for performance and I added some features.
So this mod:
1) Adds weather SOUND when you're in interiors, you'll hear rain, wind but the thing I added compared to Weather Inside is the fact that you hear PsychEroc's STORM and THUNDER sounds from interiors too! This adds quite a lot to immersion in my opinion.
2) Adds THUNDER and LIGHTNING. When it starts raining there's a 50% chance that thunder and lightning will kick in. So there won't be lightning only during thunderstorms as in previous mods of this type, I think that's better for variety.
3) Uses IMPROVED SCRIPTS with no placeatme calls: this means smaller save games and no activators clogging up the game world.
4) Introduces delayed thunder when lightning is distant
5) Has a CONFIGURATION MENU (see below): you can tweak parameters to your liking, make lightning hit farther or nearer depending on your taste, change the frequency of lightning and more.
6) Changes LIGHTNING COLOR and effect, SHOCK SPELLS look BETTER now in my opinion than in previous versions.
RECENT HISTORY:
3.0: lilith added full inside sounds to Shivering Isles. Added new options to enable/disable all visual and sound effects added by the mod. Added an Obse version compatible with all past and future weather mods. Added non-Obse versions for compatibility with Arthur's natural weather and Enhanced weather. Plus some small bug fixes and tweaks.
2.9: Got rid of the annoying icon appearing when lightning strikes. Made the script lighter when there is no storm. Removed modifications to the light effect since it is no longer used by the mod. Fixed some small bug inherited by weather inside, mostly misplaced sound activators.
2.7: Fixed a bug someone was having with storms being too short: now no storm should last less than 3 minutes (real time).
2.6: I made a mistake with the AWS esp, please don't use this version.
CREDITS AND THANKS:
PsychEroc, vine & Morbus, authors of the original mods. They have done most of the work here, so all props to them.
HTF for Atmospheric Weather System.
Max Tael for Natural Weather.
EnTropiA, Triton and Skycaptain for great help on the official forums (sorry if I'm forgetting somebody).
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http://www.tesnexus.com/downloads/file.php?id=8711