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Unusual Weather Pattern Brings Tropical Depression Rosa Flooding to Southwest Desert
Phoenix, Arizona saw its eighth wettest day in history, the Phoenix National Weather Service said, receiving 2.36 inches of rain.
Rosa soaked Baja California in Mexico on Monday before heading to the American Southwest, AccuWeather reported.
It is unusual for Pacific hurricanes or their remnants to reach Baja, let alone the Southwestern U.S., but that has been changing in recent years, CNN meteorologist Gene Norman said.
"It is possible that this could be a side effect of climate change," Norman said. "Warmer oceans are allowing eastern Pacific storms to reach higher latitudes. This was not the case earlier. It was quite rare for an eastern Pacific storm to even reach Baja California, and this is now becoming more common."
Climate change is also making tropical storms "more intense, bigger and longer-lasting, thereby increasing their potential for damage," senior scientist at the National Center for Atmospheric Research Kevin Trenberth told CNN.
For Arizona drivers, that meant increased flooding on the roads Tuesday morning. The Arizona Department of Public Safety said it responded to more than 80 crashes between 5 a.m. and noon Tuesday in the Phoenix metro area.
Some, like north Phoenix resident Sandra Kotzambasis, opted not to leave the house at all. She posted a video on Twitter of a flooded street. "Needless to say, I am working from home today," she said.
Senior Meteorologist Dan Kottlowski told AccuWeather that the higher parts of Northern Arizona and Southern Utah, where the most rain was projected to fall Tuesday night, were particularly vulnerable to flash flooding. Many side roads are made of dirt, which means they are prone to washing out, he said.
He also warned residents about a phenomenon called slot canyon flash flooding. "Heavy rainfall occurring miles away from some canyon areas will flow into areas not experiencing any important rainfall leading to a fast rise in water going from a few inches to several feet flushing anything loose through these slot canyons," Kottlowski said.
Several Phoenix roads were closed Tuesday morning and schools across the region were closed Tuesday due to rain and the risk of flooding.
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