This Lua script implements dynamic weather in BeamNG!
It’s not the prettiest, but given the game engine’s capabilities (rain, fog, clouds), it’s still quite good.
Currently in beta and not fully finished, though core features work.

Current features:
– Weather types: sunny, cloudy, light rain, rainy, stormy, foggy, foggy rain;
– Dynamic wind affecting vehicles and ground/forest objects (if supported);
– Random wind gusts with frequency and strength depending on weather;
– Tornadoes that slowly chase the player and interact with physics objects (vehicles, retaining walls, mattresses, etc.), with only one active at a time;
– Slippery roads during rain/snow (works on terrain, not meshes like bridges);
– Dynamic rain, clouds, fog, temperature, and brightness;
– UI for optional control over weather, wind, tornadoes, and road conditions;
– Compatible with career mode and missions/scenarios.

Since version 1.0, the UI toggle is bound to Ctrl + Alt + W!

How to use?
Press Alt + W to activate dynamic weather on the map.
Press Ctrl + Alt + W to hide wind gust messages and event announcements (keybinds configurable).
An on-screen message appears top-right upon activation.
Script unloads automatically on map change to prevent issues, so reactivate manually if needed.

Tornadoes are not automatically part of weather; you must enable or spawn them manually.
Spawn a tornado near your vehicle with Alt + T.
Random tornado spawning can be toggled in the UI but is not yet weather-dependent (planned for future updates).
Only one tornado can be active simultaneously.

You can trigger specific weather events or adjust settings via the UI in the main menu (Esc).
Control road conditions, wind speed, tornadoes, time between random events, and toggle snow/rain.
Alternatively, use console commands documented in the mod discussion thread.

In version 1.0.3:
– Fixed a tornado weather bug that caused incorrect behavior switching to rainy/stormy weather.

Mod author: MegaKnight