On average, you can't blame drought conditions on warming. Most of the US, for instance, has been consistently getting wetter.
Yeah, you can extrapolate from Clausius-Clapeyron and surmise that, unless it gets consistently wetter year-round, that rain events would become more intense. But that in itself won't cause lack of water for obvious reasons.
You might argue things are slightly different in the Southwestern US:
But even a sample of a hundred years might not be enough to extrapolate on long-term climate cycles in certain places, and that at the beginning of the last century, the Southwest might actually have been at its wettest in over a thousand years, so nowhere to go from there but toward drier conditions:
Same thing with tornadoes, by the way.
