Grand Canyon flash flooding deaths spur questions over whether warnings could have come sooner

TL;DR

Flash flooding in the Grand Canyon resulted in at least two deaths and one person missing.
An alert system in Bright Angel Creek, installed after a wildfire, failed to provide continuous warnings.
Officials are investigating why the river gauge system went offline during the flooding.
The park's major water pipeline was severely damaged, leaving only about two weeks of water supply.
Eighty-two people were evacuated from the canyon due to rising waters and crumbling hillsides.

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