What happened. Why it matters. Plainly.
Polo made a second landfall near Guaymas, Mexico, on Tuesday as forecasters warned its remnants would bring heavy rain and flash flooding to the U.S. Southwest.
Three died in a Navajo Nation flash flood near Newcomb, NM, as monsoon storms bring rare flood risk to Phoenix and warnings across the Southwest.
A flash flood tore through the bottom of the Grand Canyon on Saturday, August 29, 2026, at around 2:30 p.m. local time, killing two people; one person remains missing as of Sept. 1
This covers the Extreme Heat Warnings that were active from the Arizona desert to North Texas in late August 2026 — all have since expired; see the update at top for the current status