Weather patterns are changing due to the warming. There are more weather extremes, locally.
There might be more weather extremes in
some locations, over a given period of time, but also a
decrease in extreme weather events in
other locations over the same period of time.
Whether or not there has been a
net increase in extreme weather events
globally, during the past 50 years or more, cannot be determined with any confidence. Even the IPCC admits this, as I've mentioned before.
However, an increase in heat waves and precipitation events might be the exception. It is reasonable to deduce that any increase in heat waves will be exaggerated by the Urban Heat Island effect, just as it's reasonable to deduce that increased rainfall will result from more evaporation which will occur during any warming period, whatever the cause of the warming.
This uncertainty about any
global increase in extreme weather events, such as floods, droughts and hurricanes (or typhoons or cyclones depending on the location), seems to be an 'inconvenient truth' for the alarmists.
The IPCC has also made the very valid point that it's very difficult to attribute any specific, extreme weather event to a human cause, such as CO2 emissions from fossil fuels.
Despite these statements from the so-called great authority on climate matters, the IPCC, once the 'meme' pervades the consciousness of the general public, that extreme weather events are increasing as a result of mankind's CO2 emissions, every extreme weather event appears as yet another example of the effects of rising CO2 levels, and tends to be reported as such in the media, thus reinforcing the meme.