AccuWeather said the private forecasting company and the National Weather Service sent warnings about potential flash flooding hours before the devastation.

Flash floods in central Texas have led to at least 27 fatalities, including nine children, with many still missing, particularly from Camp Mystic. Patrick Keely/via REUTERS THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. MANDATORY CREDIT. NO RESALES. NO ARCHIVES. (Patrick Keely via REUTERS)

Rescuers continue to search for an estimated 20 girls who were at Camp Mystic in Hunt, Texas when deadly floods from the Guadalupe River swept through the camp.