California is the latest state to face a climate-change-fueled disaster during a fatally hot summer that won’t quit. The state was still drying out Monday from Hurricane-turned-Tropical-Storm Hilary, which dropped record-breaking rainfall and flooded neighborhoods from San Diego to Los Angeles, writes Chelsea Harvey. The deluge trapped drivers, closed schools and overwhelmed drainage systems. As disasters mount, lawmakers and climate groups are increasing pressure on President Joe Biden to declare a national climate emergency. Biden is traveling to Maui today, where the deadliest wildfire in 100 years of U.S. history has ravaged the historic Hawaiian island. Canada is still on fire, by the way, and the peak of the Atlantic hurricane season is swiftly approaching (as are another tropical storm, a tropical depression and a potential tropical cyclone). The climate connection While climate change is not the singular cause of any one weather event (besides maybe the heat index), it acts as a major amplifier. Summer drought and wildfires in Hawaii are not unusual, for example, but the combination of a warming planet and an abundance of nonnative grasses has made out-of-control blazes more likely. And in California, cold coastal waters mean the state rarely receives tropical cyclones or hurricanes. But ocean temperatures are rising. They surged to a record high last year, with global averages spiking since early March. Experts say storms like Hilary will likely remain relatively rare in California even as the climate changes, Chelsea writes. Usually, winds steer cyclones away from California and the region’s atmospheric conditions make it difficult for hurricanes to even form. But those winds have temporarily vanished, amid highly unusual weather conditions in the U.S. And warmer waters mean the hurricanes that do happen to make it up the California coast may be stronger and more damaging. Hilary ballooned into a major Category 4 hurricane in 24 hours. As it traveled over land, the storm weakened — but not enough to spare Southern California from a tropical storm.
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