Liberal cities, governors ramp up pushback to Trump deportations 
A massive heat dome across the American Southwest is driving temperatures in Phoenix and Las Vegas to record triple-digit highs. New Maxar satellite photos show how the growth of these large cities is contributing to the extreme weather. The combination of a heat dome on top of a heat island means being outside can be even more dangerous.
WSJ explains the science behind heat domes and how urban growth can make that heat even more deadly.
0:00 Record-high temperatures
0:30 Heat islands and urban growth
2:28 Heat dome science
3:49 What’s next?
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