The Hittite word al-pa-aš
Word al-pa-aš
Transliteration alpa
Meaning cloud
See also Proto-Indo-European: *h₄elbʰós ‘white’
Latin: albus ‘white’

Other words that might be of interest
ne-e-pi-iš ‘sky, heaven’, ua-ar-ša ‘fog, mist’, ar-ma ‘moon’, ḫa-aš-te-er ‘star’