The official tally of storm-related deaths across Texas rose to 131 on Monday as authorities warned of yet another round of heavy rains 10 days after a Hill Country flash flood that transformed the Guadalupe River into a killer torrent.

Rainfall amounts of 1 to 2 inches with isolated amounts of 3 to 5 inches are possible, the National Weather Service said.

Over 130 people have died after heavy rain pounded Kerr County, Texas, early Friday, leading to "catastrophic" flooding, the sheriff said.

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