LA CROSSE, Wis. — Flooding, snowstorms, a flu outbreak, even a fire — any of those might have slowed a group of Wisconsin nuns who say none of it has kept their order from praying nonstop for hundreds of thousands of people over the last 137 years. The La Crosse-based Franciscan Sisters of Perpetual Adoration claim to have been praying night and day for the ill and the suffering longer than anyone in the United States — since 11 a.m. on Aug. 1, 1878.