( ( ( ( Rapidly changing ) ( weather conditions ) ) ( involving ( ( ( ( ( ( severe icing ) , ) ( severe turbulence ) ) , ) and ) ( heavy precipitation ) ) ) ) ( ( ( ( ( are common ) , ) particularly ) ( in winter ) ) . ) )
(ROOT (S (NP (NP (ADJP (RB Rapidly) (VBG changing)) (NN weather) (NNS conditions)) (VP (VBG involving) (NP (NP (JJ severe) (NN icing)) (, ,) (NP (JJ severe) (NN turbulence)) (, ,) (CC and) (NP (JJ heavy) (NN precipitation))))) (VP (VBP are) (ADJP (JJ common)) (, ,) (ADVP (RB particularly)) (PP (IN in) (NP (NN winter)))) (. .)))
Rapidly changing weather conditions involving severe icing, severe turbulence, and heavy precipitation are common, particularly in winter.
(ROOT (NP (NP (NP (NNP Precipitation)) (ADJP (RB commonly) (JJ occur))) (PRN (-LRB- -LRB-) (PRP s) (-RRB- -RRB-)) (PP (IN along) (NP (DT a) (JJ cold) (NN front))) (. .)))
Precipitation commonly occur(s) along a cold front.