Focusing on intensity:

* Whirlwind is to breeze as downpour is to drizzle. (Both pairs represent a drastic difference in intensity.)

* Whirlwind is to breeze as downpour is to mist. (Again, emphasizing the difference in volume and force.)

Focusing on water:

* Whirlwind is to breeze as downpour is to puddle. (The first pair describes air movement, the second describes water accumulation.)

* Whirlwind is to breeze as downpour is to stream. (Both pairs represent a scale of water movement, from small to large.)

Focusing on other elements:

* Whirlwind is to breeze as downpour is to avalanche. (Both pairs are powerful natural phenomena, with the first pair involving air, and the second involving snow/earth.)

* Whirlwind is to breeze as downpour is to eruption. (Both pairs describe sudden and intense events, one involving air, the other involving volcanic activity.)

More creative analogies:

* Whirlwind is to breeze as downpour is to a flood of tears. (This emphasizes the suddenness and overwhelming nature of both phenomena.)

* Whirlwind is to breeze as downpour is to a burst of inspiration. (This analogy uses metaphorical language to compare both events to a sudden influx of something powerful.)

Remember, the best analogy depends on the specific context and the desired emphasis.