Fictional but Realistic Weather Mode

My Wish: A fictional but realistic seamless Worldwide weather engine, one that has no pop ins and generates realistic weather and systems depending on time of year, location etc. and does not rely on METAR or LIVE servers . And new cloud system to go with it (i.e. cirrus and better looking more varied cloud types and more realistic thunderstorms etc.). Can coincide with snow coverage (also being fictional but realistic depending on if area has been getting snow, temperature etc.) This also allows the ability to simulate a smoother winds aloft (no abrupt changes unless the fictional nature calls for this), icing, ice/sleet/dangerous supercell Thunderstorms and more. Perhaps this new mode would be a great fit with the seasons release?