Regardless of the cause, NASA's data on mean ocean surface temperatures, both globally and in the tropics, show an undeniable warming trend. This means that there is more energy in the atmosphere and also more water vapor in the atmosphere. This translates into more energetic storms and more precipitation when the moist air encounters cooler air.
The exact way in which this will increase the violence and flooding cannot be predicted without a good computerized weather model, which I do not have. However, we do have some actual data, for example the flooding and the storms that have recently hit Australia and the big rain/snow storms recently in the USA. This is only an indication and not a proper global model, which will vary locally much more than it varies globally because it is so dependent upon the local wind directions.