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Luigi Brogno
,
Francesco Barbano
,
Laura Sandra Leo
,
Harindra J. S. Fernando
, and
Silvana Di Sabatino

1. Introduction The low-level jet (LLJ) is a strong and narrow airstream typically observed within the planetary boundary layer (PBL) ( Stull 1988 ). The LLJ wind speed profile usually takes the shape of a nose, namely, a maximum with a fast decay of the wind speed with height both below and above it. Deviations from this “canonical” shape have been observed in the literature, consisting of wind speed profiles with two noses simultaneously observed along the vertical. These “atypical” LLJs will

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