First lady Melania Trump warned residents in the path of Hurricane Harvey to "stay safe" as heavy rain and winds moved in over Texas.

"For those living near the path of #HurricaneHarvey stay safe! Thoughts & prayers of an entire country are with you," she wrote Friday morning.

The National Hurricane Center expects "devastating and life-threatening flooding" across parts of the Texas coast through Wednesday.

Residents have been strongly urged to evacuate.