( ( Although ( tornadoes ( may ( occur ( at ( ( any time ) ( of ( the year ) ) ) ) ) ) ) ) ( , ( ( ( peak ( tornado occurrence ) ) ( in Arkansas ) ) ( ( is ( during ( the spring ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN Although) (S (NP (NNS tornadoes)) (VP (MD may) (VP (VB occur) (PP (IN at) (NP (NP (DT any) (NN time)) (PP (IN of) (NP (DT the) (NN year))))))))) (, ,) (NP (NP (JJ peak) (NN tornado) (NN occurrence)) (PP (IN in) (NP (NNP Arkansas)))) (VP (VBZ is) (PP (IN during) (NP (DT the) (NN spring)))) (. .)))
Although tornadoes may occur at any time of the year, peak tornado occurrence in Arkansas is during the spring.
(ROOT (S (NP (NNS Tornadoes)) (VP (MD can) (VP (VB occur) (PP (IN in) (NP (DT any))))) (. .)))