DALLAS (AP) - Tornado warnings have expired for parts of North Texas but the area remains under a tornado watch until the evening.

The National Weather Service had issued a tornado warning until 2:30 p.m. Wednesday for sections of Dallas, Tarrant and Denton counties. Forecasters say a tornado watch remains in effect throughout parts of North Texas until 8 p.m. Wednesday.

Dark clouds hovered in the Dallas-Fort Worth-Arlington metropolitan area during the tornado warning period, with no immediate reports of weather-related injuries or damage.

The aviation tracking website FlightAware.com listed about 550 flights canceled Wednesday at Dallas-Fort Worth International Airport amid the severe weather. More than 100 flights were canceled at Love Field, closer to downtown Dallas.

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