To me, this is the most misused word in meteorology. Most people believe monsoon means rain or flooding, but that isn't true. The seasonal wind change does usually bring rain, so that explains the confusion. The monsoon is more pronounced in India and the desert southwest in the United States. Massive flooding can occur in India from the winds coming in from the south, bringing in abundant moisture from the Indian Ocean. Arizona and New Mexico get summer thunderstorms from the monsoon. The dust storms (or haboob, another Arabic word) you've seen in recent weeks in Phoenix also come from the monsoon.