Hurricane Polo was a Baja California problem on Monday, and by midweek it becomes a Southwest problem. The major Pacific hurricane was bearing down on Mexico's peninsula with life-threatening rain, mudslides and storm surge possible. But its lasting punch may come farther north. Tropical moisture is streaming into Arizona, New Mexico, Utah and Colorado, where it is meeting a large storm system arriving from the west.
Forecasters flagged Santa Fe, Flagstaff and the Grand Canyon area for a serious flood threat, and a statewide flood watch covers New Mexico. Four to six inches of rain are possible in spots, and the danger then shifts toward Texas, including Dallas, later in the week. More than 14 million people face flood risk across nearly a dozen states this week. If you live in these areas, never drive through floodwater, especially near arroyos and burn scars. Shallow-looking water can turn dangerous surprisingly fast.