Allhvass

As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):

allhvass

a. blowing very hard (var allhvast í norðan).

Possible runic inscription in Younger Futhark:ᛅᛚᛚᚼᚢᛅᛋᛋ

Also available in related dictionaries:

This headword also appears in dictionaries of other languages closely related to Old Icelandic.

• Old Norwegian - Johan Fritzner's Dictionary