I'm wondering if a pine forest with near-constant rain and thunder could be possible. I was thinking that possibly something like this could be created by high mountains next to this place, lightning-wise, or somewhere on a tidally locked planet, but I don't know a lot about this topic. What geographical and other conditions might create a place like this?
Maybe not according to Hard Science, but plausible enough for believability.
The storms (and associated lightning) are likely the result of the winds blowing across the Maracaibo Lake and surrounding swampy plains. These air masses inevitably meet the high mountain ridges of the Andes, the Perijá Mountains (3,750 m), and Mérida's Cordillera, enclosing the plain from three sides.
That's a classic Rain Shadow.
Put that geographic scenario in the subtropics (mid-to-Northern Mexico through the Southern US), and you've got lots of rain, thunder and pine trees!
On a tidally locked planet, though? Not plausible, because of the weather extremes created by one side being permanently sunny and hot, and the other side permanently dark.