Authorities are still assessing the deadly effects of heavy rains that caused devastating flash floods in Texas Hill Country, leaving at least 32 people dead and many others missing as frantic parents sought word about their daughters unaccounted for at a girls camp near the Guadalupe River.

Texas floods have once again highlighted the deadliest weather threat in the US flash flooding. More than 50 people have died and many remain missing.

Flooding has caused an average of more than 125 deaths per year in the United States over the past few decades, according to the National Weather Service, and flash floods are the nation’s top storm-related killer.