Except on the Atlantic coast, the timing of the peak point in the migration varies according to latitude. Right now should be the peak for the north shore of Lake Erie and two weeks from now you should be seeing alot fewer monarchs. The only exception is if strong southerly winds occur in an area for many consecutive days at a time. Prolonged strong southerly winds can delay the progress of the migration, thus causing large buildups of migrants to occur on dates past the usual peak dates. Conversely, prolonged northerly winds can disperse the migrants so that observers hardly notice any particular days of peak movement.