Weather that is unusual and sustained for a period of time is seen as a sign of climate change. For example, warmer summer months in the arctics are unusual and causing more ice to melt than is normal. Also, longer periods of hot weather and drought are a sign that climate change is upon us. Even though freak weather can happen and may or may not be a sign of climate change, usually sustained freak weather can be an indicator.
Fluctuations in the ENSO cycle (el nino/la nina) cycle have intensified with climate change. This means that areas in the west have seen stronger drought conditions during the la nina cycle, and stronger storms during the el nino cycle. This has already contributed to the severity of wildfires in Colorado and Texas.
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