KERRVILLE, Texas, July 8 (Reuters) - The death toll from the July Fourth flash flood that ravaged a swath of central Texas Hill Country rose on Tuesday to at least 109, many of them children, as search teams pressed on through mounds of mud-encrusted debris looking for scores of people still missing.

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