Usual weather patterns follow the historically established (expected) patterns. Kinda like the cycle of the stars, moon and sun. Global warming has happened before, maybe not as bad as today, but it has happened. Today's weather is unusual because we are having 2 days of 30 degree followed by 2 days of 90 degree. Dryer then normal in some areas, wetter then normal in other areas. Floodplains are being reestablished, so much so that FEMA had to update and re-issue their Flood Maps. Plus, it just doesn't feel right.