The Collaborative International Dictionary of English v.0.48:

Northeasterly \North`east"er*ly\, a.
   Pertaining to the northeast; toward the northeast, or coming
   from the northeast.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Northeasterly \North`east"er*ly\, adv.
   Toward the northeast.
   [1913 Webster]

WordNet (r) 3.0 (2006):

northeasterly
    adj 1: coming from the northeast; "northeasterly winds" [syn:
           northeasterly, northeast]
    2: situated in or oriented toward the northeast; "the
       northeasterly part of the island" [syn: northeastern,
       northeasterly, northeast]