Here's what to know about the deadly flooding, the colossal weather system that drove it and ongoing efforts to identify victims.

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The Flood Watch in effect for parts of the southern Plains, including much of Oklahoma and Texas, was expanded southeast this morning to encompass areas that were hit hard by catastrophic and deadly flash flooding last weekend, including Kerr, Travis and Burnet Counties.

The first weather emergency alert sent by the National Weather Service with urgent language instructing people to "seek higher ground now" was sent at 4:03 a.m. local time.

White House press secretary Karoline Leavitt had to explain to Hearst Television White House correspondent Kalyn Norwood on Monday why

More than 100 people have been confirmed dead since July 4, when the Guadalupe River in central Texas swelled overnight and triggered flash floods that swept through an area known locally as “Flash Flood Alley.

Recordings provided to CBS News showed first responders asking for an emergency alert to be sent, but dispatchers delayed because they needed special authorization.

Authorities have issued a Blue Alert for Benjamin Hanil Song, wanted in a North Texas ICE facility ambush on July 4 that wounded an officer.