In #8 we looked at the overview on floods. The IPCC report, AR6, says: Flooded area is difficult to measure or quantify and, for this reason, many of the existing studies on changes in floods focus on streamflow. Thus, this section assesses changes in flow as a proxy for river floods, in addition to some types of flash floods.
Floods are one area area where humans have been successfully adapting for a long time. Better forecasts have also been helping us adapt to both floods and hurricanes. In both of these cases, one might say were have been mostly adapting to the existing climate rather than changing climate. Skeptics might argue that 1 degC of warming (mostly in winter and at night) isn't a big change that requires adapting to.
IIRC, there are number of weather phenomena associated with flooding. The first phenomena are stationary weather fronts ("cutoff" low pressure systems) that cause excessive rain to fall in one place, say the Mississippi river basin. This is probably what is being quantified by streamflow. It would be interesting to know if the atmospheric rivers that have been drenching California with rain and burying it under 40 feet of snow are associated with a stationary front in the Pacific or some other phenomena. The second phenomena are localized flash flood enhanced by the extra water vapor carried by warm air. The change here is big, but highly localized and probably not easily detected by streamflow. You've already mentioned more flooding from slower moving hurricanes.
Floods are one area area where humans have been successfully adapting for a long time. Better forecasts have also been helping us adapt to both floods and hurricanes. In both of these cases, one might say were have been mostly adapting to the existing climate rather than changing climate. Skeptics might argue that 1 degC of warming (mostly in winter and at night) isn't a big change that requires adapting to.
IIRC, there are number of weather phenomena associated with flooding. The first phenomena are stationary weather fronts ("cutoff" low pressure systems) that cause excessive rain to fall in one place, say the Mississippi river basin. This is probably what is being quantified by streamflow. It would be interesting to know if the atmospheric rivers that have been drenching California with rain and burying it under 40 feet of snow are associated with a stationary front in the Pacific or some other phenomena. The second phenomena are localized flash flood enhanced by the extra water vapor carried by warm air. The change here is big, but highly localized and probably not easily detected by streamflow. You've already mentioned more flooding from slower moving hurricanes.