Flash floods in Texas have killed at least 107 people over the Fourth of July weekend, with more than 160 still missing.

Multiple parts of Central Texas, including Kerr County, were shocked by flash floods Friday when the Guadalupe River and others rose rapidly.

More than 111 people have died across six counties after flash flooding from heavy rain began affecting the state last week.

Several hundred people have gathered for a worship ceremony at a high school stadium in Texas. The vigil was held Wednesday evening to remember of the at least 120 people who died in the catastrophic flash floods over the July Fourth holiday.

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

There are reports some cloud seeding occurred a few days before the Texas flash flood. But it’s important to understand that cloud seeding has a relatively short-term effect in that a certain cloud is seeded and perhaps turns into one individual rain cloud or even a thunderstorm. The increased rainfall would not last for days.

The region of Texas where flash flooding killed more than 90 people -- including dozens of campers -- is known for its tendency to experience flood emergencies.

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.

Texas flash floods prompted Kesha to cancel her concert, prioritizing fan safety while promising to honor tickets for a rescheduled show the next night.

Flash flooding is common enough around the crescent-shaped region from Dallas through the Hill Country, the area earned the nickname "Flash Flood Alley."