Severe flash floods have prompted mass evacuations in Hawaii.
Residents near Wahiawā dam are at risk of being trapped.
Authorities are monitoring the dam for potential collapse.
Strategic angle: Officials warn some residents could be trapped by rising waters as Wahiawā dam on Oahu ‘may collapse at any time’.
Severe flash floods have prompted mass evacuations in Hawaii.
Residents near Wahiawā dam are at risk of being trapped.
Authorities are monitoring the dam for potential collapse.