[hansvm]

Ignore the storm for a moment, and ask whether a bird can fly for 7h+, either from flapping, gliding, or navigating updrafts. The answer is yes, that's trivial for many many bird species, especially those with a propensity for ocean travel. The storm then just changes the baseline ground speed.

[my12parsecs]

There's stuff like dynamic soaring that Albatrosses use to travel thousands of miles over the ocean using little energy.

Some enthusiasts use this to make RC gliders go really fast, and the record is over 500 mph.

https://en.wikipedia.org/wiki/Dynamic_soaring