HOUSTON — More than 470 flights have been cancelled 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 cancelled 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.

Flash flood watches have been issued through Tuesday morning for Houston, Austin, San Antonio, Dallas, Fort Worth, Tyler-Longview and as far east as Texarkana.