Deadly flooding emergency in Texas

A line of severe storms, up to a half foot of rain, drenching Central Texas and causing flash flooding.
2:29 | 04/24/19

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Transcript for Deadly flooding emergency in Texas
And the deadly storm system bringing flash floods and water rescues. A mother and her two children swept away. Heavy rain and fierce winds. The father the only one to survive. And the tractor trailer danging over the edge in Texas. This entire system is moving east. Marcus Moore leading us off from Dallas. Reporter: More than half a foot of rain in some areas already causing flash flooding. High waters sweeping away a family of four. A mother and two children dying. Outside Dallas, an SUV colliding with a semi on wet roads. Winds gusting above 60 miles per hour at the airport. And to the east, dozens of vehicles submerged in the airport parking garage. This has been a major operation and cleanup all morning long. Reporter: Tonight, investigators trying to figure out what caused some 25 trains to leave the tracks. And you see the raging water behind me as the rain continues to fall. Much of central Texas is still under a flash flood watch. Some areas could get as much as a half a foot of rain tonight. And rob Marciano is tracking it all. Hi, rob. Reporter: It's going to take two days to get to the east, and severe weather, tornadoes popping up along the cold front. Moving through Houston, then a low through Arkansas. Lake Charles, Lafayette tomorrow morning, mobile in the afternoon. Into the Carolinas, then D.C. During the day on Friday. D.C., New York, late Friday could be a mess here in the David? Rob, thank you. The other developing headline late today, the grim

This transcript has been automatically generated and may not be 100% accurate.

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