A combination of steep terrain, shallow soil and a moisture-laden weather system that stalled over the Texas Hill Country caused the flash floods that killed at least 79 people Friday. The weather system that caused the flooding was fueled by moist air from the coastal plain that swept up the Hill Country’s steep cliffs,

Texans were caught with deadly rising waters in the middle of the night, leaving many to question the forecast and the alerts. Here’s a look at the timeline.

Flash floods in Texas have killed nearly 90 people, many of them children. Heavy rains fell quickly in the predawn hours Friday in the Texas Hill Country, causing the Guadalupe River to rise 26 feet in just 45 minutes.

With additional rain on the way, the risk of more flooding was still high in saturated parts of central Texas.