Officials are describing the historic heat wave hitting Canada and across the Pacific Northwest as intense and dangerous, pushing daytime temperatures into the triple digits breaking all-time high temperature records in places unaccustomed to such extreme heat.
A warmer world is leading to more volatile weather events, including extremes of heat, cold and rainfall. Climate change may also be affecting tornado activity in the US. Scientists who study tornadoes are noticing ominous changes in the way recent tornadoes occur, though more research is needed to demonstrate a causal link.