As former Hurricane Polo weakens over northwestern Mexico, the storm’s remnants are battering the U.S. Southwest, flooding roadways and forcing residents in small New Mexico towns to evacuate over concerns about a dam failing. ↧ Hurricane Polo’s remnants bringing more rain to flood-struck U.S.... Bands of rain continued to sweep across the U.S. Southwest, causing desert rivers to surge and usually dry arroyos to rage with floodwater.