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Salon
Salon
Science
Nicholas Grondin

HISTORICAL FACTS: Hurricane threatens extreme flooding - The Untold Story

Hurricane Hilary headed for Mexico's Baja peninsula as a powerful Category 4 storm on Aug. 18, 2023, and was forecast to speed into Southern California at or near tropical storm strength as early as Aug. 20. For the first time ever, the National Hurricane Center issued a tropical storm warning for large parts of Southern California.

Hurricane scientist Nick Grondin explains how Hurricane Hilary, with help from El Niño and a heat dome over much of the country, could bring dangerous flash flooding, wind damage and mudslides to the U.S. Southwest.

How rare are tropical storms in the Southwest?

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