As I said, I like it with regards to spells related to wind or storms like expeditious retreat, feather fall, jump, thunderbolt, gust of wind, levitate, shatter, gaseous form, lightning bolt, sleet storm, ice storm, and chain lightning.That's a nice bit of flavor in that case.
On the other hand, when casting spells like charm person, disguise self, silent image, detect thoughts, tongues, etc. I'm less of a fan of the Heart of the Storm feature. Those spells have nothing to go with storms or storm magic. How exactly does tapping into the power of the storm, the plane of elemental air, or whatever help me to detect thoughts?
Yes, it's probably possible to come up with an explanation, but it will always be like grasping for straws; it's always going to feel like turtles all the way down to me.