Miami ? Tropical waves that form off the coast of Africa can carry torrential rain and sometimes spin into monster hurricanes.

But there are also dry waves that deliver Saharan dust as far as South Florida, as was the case over the weekend. The dust was expected to linger until Wednesday, when ocean breezes and afternoon rain should wash it away, said meteorologist Brad Diehl of the National Weather Service in Miami.

“We’re under a dome of high pressure, and that makes the atmosphere very stable,” he said. “With very stable conditions, it’s difficult for the dust to be removed.”

Today’s forecast calls for highs in the low 90s with a heat index as high as 102 degrees – and more dust.

Generally, Saharan dust outbreaks turn skies hazy, reduce visibility for pilots and produce spectacular sunrises and sunsets. They also can make breathing difficult for those with respiratory problems, although no problems were reported on Monday.