The Collaborative International Dictionary of English v.0.48:
Northeastward \North`east"ward\, Northeastwardly \North`east"ward*ly\, adv. Toward the northeast. [1913 Webster]WordNet (r) 3.0 (2006):
northeastwardly adv 1: in a northeastward direction; "the river flows northeastward to the gulf" [syn: northeastward, northeastwardly]