See quotation.
1870. A name originally given to a thick white mass of cold vapour which sometimes veils the mountain tops [of Nevada] and sometimes fills the valleys is employed to characterize these terrible storms. Tell a miner acquainted with White Pine that you have had to face the Po-go-nip and he will at once know that all your powers of endurance have been put to the test.—Rae, ‘Westward by Rail,’ p. 209–10 (Lond.).
