KANSAS CITY, MO.- The enormous popularity of three panels of a remarkable water lily triptych by Claude Monet has prompted extended hours at The Nelson-Atkins Museum of Art as the exhibition nears its closing date of Aug. 7. Monets Water Lilies reunites the right-hand panel, from the Nelson-Atkins collection, with panels owned by the Saint Louis Art Museum and the Cleveland Museum of Art. The three were last exhibited together in 1979. With the exception of a triptych in New Yorks Museum of Modern Art, this is the only Monet triptych in the United States. The Museum will be open until 9 p.m. Wednesday through Saturday, July 2730, and until 9 p.m. Wednesday through Saturday Aug 36. There will be a Happy Hour in Bloch Lobby from 5:308 p.m. on Wednesday, Thursday and Saturday of both weeks. There will be live music and dinner served in Rozelle Court each Friday night from 59 p.m., with