"These events are starting to occur more and more often," said Manuel de la Torre Juarez of NASA JPL. "We expect to see more in the future."
Previous rovers have spotted and even recorded dust devils dancing across the Martian terrain, but scientists said Curiosity has not yet seen evidence that the swirling winds have lifted dust.
Curiosity's ultimate destination is a 3-mile-high mountain rising from the center of the crater floor that's rich in mineral deposits. Scientists had hoped to drive to the base of the mountain before the end of the year, but that doesn't look likely after the extended stay at its current spot.
Follow Alicia Chang at http://twitter.com/SciWriAlicia .