From Longman Dictionary of Contemporary Englishnorthwestwardsnorth‧west‧wards /ˌnɔːθˈwestwədz $ ˌnɔːrθˈwestwərdz/ (also northwestward) adverb SGtowards the northwest —northwestward adjective
Examples from the Corpus
northwestwards• The flow rotates from uniformly northwestwards to northwards close to the poleward edge of the cusp. 