Nearly 11 percent of the continental United States is in moderate drought or worse, said Richard Heim, a meteorologist with the National Oceanic and Atmospheric Administration, in this week's drought summary.
"What's driving the weather? It's kind of a car with no one at the steering wheel," Mr. Heim said. "None of the atmospheric indicators are really strong. A lot of them are tickling around the edges and fighting about who wants to be king of the hill, but none of them are dominant."