According to global warming theory, CO2 warming results in less extremes, as night time temps rise, there is less of an extreme range for temperatures. The warming arctic, and warmer winters results in less differential between the normal warm moist tropical air masses, and the northern high pressure systems, like what we observe in the NH warm season. The meeting of cold fronts with warm moist air is the driver of most of the extreme weather, warming would cause less extremes in both temperature changes, as well as weaker jet streams, as the arctic air is warmer longer.
This recent change to “warming causes more extreme weather” is actually an un-scientific view, not supported at all by the theory. Strong early cold fronts, and strong winter fronts result in the extremes, which are usually only experienced in late winter and spring, when tornado outbreaks usually occur.
Warming theory predicts less extremes in weather, especially during winter.
More rain, less ice and snow. That’s what the greenhouse theory predicts.