Texas Hill Country floods test new warning systems after last year's deadly disaster

Residents in some hard-hit areas said a year of preparation did make a difference. Newly installed flood sirens sounded in the darkness. Phones buzzed with alerts that weren't sent out last year.

Residents in some hard-hit areas said a year of preparation did make a difference. Newly installed flood sirens sounded in the darkness. Phones buzzed with alerts that weren't sent out last year.