There are a number of places in which cumulonimbus clouds - and therefore, thunderstorms - are likely to form, such as:
- Cold fronts, where masses of cold air move into hot, moist air masses
- Around the equator, where the trade winds of both hemispheres come together
- Mountainous areas, which increase uplift of air
Say we took an equatorial location, surrounded by mountains on its inland sides, where moist, warm air from the sea collided with cool air from the mountains. In theory, this should tick all three boxes, but would this be sufficient for thunderstorms to occur year round, for at least 20 hours a day? Is something like this even possible?
EDIT: picture for clarity:
The closest thing to this Earth has is the mouth of the Catatumbo River, Venezuela, where storm clouds are present 10 hours per day, on 140-60 days a year. However, this is less than halfway to the scenario I'm aiming for.