It's like an action movie escape. I'm really, really glad I wasn't on that flight, but it's exciting to watch from a safe remove!
Once you're in the air, and once you reach cruising altitude, you're fine. The real danger is landing in the storm, with low visibility and high winds.
That PVR-SFO flight was the scariest of my life; with no service and FAs strapped to their chairs for the entire 4h of the flight.