Un pileus (sau pilei), numit şi nor-pălărie este un nor orizontal, irizat, care are o durată scurtă. Denumirea vine din latină, „pileus” însemnând „cupă”.
Norii pileus apar de regulă deasupra altor nori precum cumulus sau cumulonimbus.
Sunt dinamici şi îşi schimbă rapid forma. Norii-pălărie sunt formaţi din curenţi puternici de aer umed ce provine din latitudini joase.
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