The remnants of Hurricane Lorena are sending a surge of tropical moisture into the U.S. Southwest, creating a significant threat of heavy rainfall and flash flooding throughout the weekend. Southern Arizona, New Mexico, and Texas are in the crosshairs, with forecasts predicting rainfall totals of 1 to 2 inches. This influx of moisture is compounded by ongoing monsoon activity and the influence of frontal systems, further elevating the risk of dangerous flooding conditions.