How did Cosequina ash reach Kingston against the wind?

Gibb writes that Cosequina erupted in January 1835 and that ash fell at Kingston, Jamaica, a reported 700 miles away^[1]. Although an east wind was blowing, he attributed the ash’s journey to an upper-level countercurrent moving against it. That is Gibb’s historical explanation, not a demonstrated account of the winds during the eruption^[2].