We know from GtG and KoS is that with the Windstop Orlanth and Ernalda are dead. Immediately a Great Winter began and everything froze. The air is dead, the winds are gone. "Children were not born, seeds did not sprout, fruit did not grow" and "All of Kerofinela froze".
What I'm wondering about is other effects.
1) The rivers of Dragon Pass. No winds, no clouds, no rain. And freezing air. That suggests that most rivers in Dragon Pass dry up and/or freeze over except those protect