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What to know: Tropical Storm Priscilla to drench Southwest US, raising deadly flash flood risk
Flash flooding is a growing risk in the southwestern U.S. through this weekend. The reason is a tropical storm headed inland from the Pacific Ocean.
The NWS has been tracking the surge of moisture from Priscilla as it shifts northward. On Thursday, the NWS Weather Prediction Center warned that Phoenix and Winslow, Arizona, faced a moderate risk of flash flooding, in which there was at least a 40 percent chance of flash flooding.