[rustbucket]

one possible reason why the Yankees won the war was that they were familiar with the prevailing wind patterns of the Atlantic.

ROTFL. The Spanish first observed the Gulf Stream, and its effect on sea traffic and that of the accompanying winds were known among mariners before it was made public knowledge by Benjamin Franklin.

Since the Yankees killed their sea trade with the Morrill tariff, what difference did knowledge of the effect of currents and winds on trans-Atlantic transit times make?

[Non-Sequitur]

Since the Yankees killed their sea trade with the Morrill tariff, what difference did knowledge of the effect of currents and winds on trans-Atlantic transit times make?

And how did that kill their sea trade? It continued on throughout the war and afterwards.