Both Florida and Alabama have declared states of emergency ahead of Hurricane Michael.
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The alert was the latest in a series of false alarms over the past month.
Ash columns as high as 2.5 miles have caused more than 440 flight cancellations Tuesday.
The earthquake killed 530 people in Iran and injured over 7,800, making it the world’s deadliest earthquake this year.
California Gov. Jerry Brown declared a state of emergency for the counties that have been affected by the flames, including Napa and Sonoma.