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Isaias strengthens into the first hurricane of the Atlantic season
The National Hurricane Center confirmed that Isaias officially strengthened into a hurricane in the Gulf of Mexico, marking the development of the Atlantic basin's first hurricane of the season.
Isaias's late emergence breaks a 121-year historical anomaly, tying an October 8, 1905 record for the latest date on record that a first hurricane has formed during an Atlantic hurricane season.
Meteorologists attribute the unusually quiet Atlantic hurricane season to a strong El Niño pattern, which produced hostile atmospheric wind shear and cooler basin temperatures that suppressed tropical development through most of the summer.
State authorities across the northern U.S. Gulf Coast, including Florida and Louisiana, have issued emergency advisories and urged coastal communities to finalize disaster preparation plans.
Weather models project Isaias to track toward the central U.S. Gulf Coast by the weekend, with forecasters warning of heavy rainfall up to 10 inches, coastal storm surges, and potential flash flooding.