( ( ( An ( upper ( level trough ) ) ) ( known ( as ( the ( Kona Low ) ) ) ) ) ( ( ( ( ( ( moved down ) ( over ( the islands ) ) ) again ) and ) ( created ( stormy weather ) ) ) . ) )
(ROOT (S (NP (NP (DT An) (JJ upper) (NN level) (NN trough)) (VP (VBN known) (PP (IN as) (NP (DT the) (NNP Kona) (NNP Low))))) (VP (VP (VBD moved) (PRT (RP down)) (PP (IN over) (NP (DT the) (NNS islands))) (ADVP (RB again))) (CC and) (VP (VBD created) (NP (JJ stormy) (NN weather)))) (. .)))
An upper level trough known as the Kona Low moved down over the islands again and created stormy weather.
(ROOT (S (NP (PRP You)) (VP (MD can) (VP (VB expect) (ADJP (JJ stormy)) (SBAR (IN if) (S (NP (NP (DT a) (NN center)) (PP (IN of) (NP (JJ low) (NN pressure)))) (VP (VBZ is) (VP (VBG moving) (NP (PRP$ your) (NN way)))))))) (. .)))
You can expect stormy if a center of low pressure is moving your way.