HI, but could the one you call breeze pass through the walls of Ered Lómin? Or will it be directed upwards and become jet streams?
Seriously, so it could mean to show Manwë's anger towards Morgoth - for obvious reasons - and the Noldor - who still trust to their might, despite the earlier lessons at Bragollach. And he chose Hithlum, because it is very well the center of the effort against Morgoth - aside from being nearest to the sea.
And perhaps a reminder:
"He-
llo! Your hope of victory still depends from us people beyond the Sea!"