( ( As ( air ( continues ( to ( ( rise rapidly ) ( ( causing ( the ( ongoing ( heavy convection ) ) ) ) ( in ( the eyewall ) ) ) ) ) ) ) ) ( , ( there ( ( is ( ( ( a pocket ) ( of ( air ( immediately ( inside ( of ( ( the eyewall ) ( of ( the hurricane ) ) ) ) ) ) ) ) ) ( that ( sinks ( toward ( the ( ( water or ) ground ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN As) (S (NP (NN air)) (VP (VBZ continues) (S (VP (TO to) (VP (VB rise) (ADVP (RB rapidly)) (S (VP (VBG causing) (NP (DT the) (JJ ongoing) (JJ heavy) (NN convection)) (PP (IN in) (NP (DT the) (NN eyewall))))))))))) (, ,) (NP (EX there)) (VP (VBZ is) (NP (NP (DT a) (NN pocket)) (PP (IN of) (NP (NP (NN air)) (PP (ADVP (RB immediately)) (IN inside) (IN of) (NP (NP (DT the) (NN eyewall)) (PP (IN of) (NP (DT the) (NN hurricane))))))) (SBAR (WHNP (WDT that)) (S (VP (VBZ sinks) (PP (IN toward) (NP (DT the) (NN water) (CC or) (NN ground)))))))) (. .)))
As air continues to rise rapidly causing the ongoing heavy convection in the eyewall, there is a pocket of air immediately inside of the eyewall of the hurricane that sinks toward the water or ground.
(ROOT (S (NP (NNS Rises)) (ADVP (RB then)) (VP (ADVP (RB sinks)) (VBZ does) (NP (NP (JJR deeper) (NN material) (NN cause) (NN convection)) (PP (IN in) (NP (DT the) (NN mantle))))) (. .)))