Flash flooding in the Grand Canyon, which killed at least one person, was fueled by Arizona’s monsoon season, a record-breaking El Niño and a marine heat wave. These factors increased atmospheric moisture by 5 to 15 percent, leading to extreme rainfall.

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How each outlet headlined it

• The Washington Post left

  Flash flooding in the Grand Canyon, which killed at least one person, was fueled by Arizona’s monsoon season, a record-breaking El Niño and a marine heat wave. These factors increased atmospheric moisture by 5 to 15 percent, leading to extreme rainfall.
• CNN left

  A second body has been recovered after Grand Canyon flash flooding. Roughly a dozen are believed missing as more rain is expected later today. https://cnn.it/4i4s6Je
• Bloomberg center

  At least two people have died after a flash flood in the Grand Canyon, the National Park Service said Monday. Some 15 others may be missing or unaccounted as search efforts progress. (Source: Bloomberg)