'I saw the new moon late yestreen Wi' the auld moon in her arm; And if we gang to sea, master, I fear we'll come to harm.'--"Sir Patrick Spens" (Scottish ballad, Anon.). From Arthur Quiller-Couch, ed. 1919. The Oxford Book of English Verse: 1250–1900, via Bartleby.com.
The photo was taken from the Brooklyn Heights Promenade. The omen proved true, as the weather turned bad later.