HOUSTON (AP) — The Latest on heavy rains and flooding in the Houston area (all times local):

9:20 a.m.

More than 470 flights have been canceled in Houston after storms dumped about 16 inches of rain on the area.

George Bush Intercontinental Airport officials have reported at least 335 cancellations Monday. More than 135 flights have been canceled at William P. Hobby Airport.

A Houston Airport System statement says some roads are flooded near George Bush Intercontinental Airport, in the north of the state's largest city.

The National Weather Service has issued a flash flood watch for the Houston area through Tuesday morning.