Tech did get a hit a bit harder than some of other sectors, which is a bit of red flag, but the QQQ is still over the 50day moving average.

FORBES: Google And Apple Going Strong Into Fourth Quarter

Friday's warning was "a major red flag" and "quite a bit more expansive" than past alerts, said Kathleen Fairfax, vice president for global education at Arizona State University.

CNN: U.S. broadens Mexico travel warning