Isaias downgraded to post-tropical cyclone after landfall in Florida

Hurricane Isaias transitioned from a hurricane to a post-tropical cyclone after making landfall in northwestern Florida, according to the National Hurricane Center. The storm weakened rapidly as it moved inland, bringing heavy rain, strong winds, and life-threatening storm surge to the Gulf Coast. Isaias made landfall near Destin, Florida, prompting mandatory evacuations and the shutdown of businesses.

More than 300,000 customers in Florida and 200,000 in Alabama were left without power on Friday night. Florida Governor Ron DeSantis stated that the state was prepared with supplies and personnel to respond to the storm's impact. President Donald Trump canceled a visit to a college football game in Alabama due to the hurricane. Mandatory evacuations were in effect for several Florida counties, but impacts were expected across a large portion of the southeastern US.

Storm surge and heavy rainfall were predicted to cause flooding, with water potentially reaching nine feet in some areas around the Alabama-Florida border. Two airports in northwestern Florida had suspended operations. The rapid intensification of Isaias was fueled by record-warm Gulf waters, made even warmer by climate change. El Nino, a strong warm phase of the El Nino-Southern Oscillation, created strong vertical wind shear over the Atlantic, inhibiting hurricane development.

However, the record-high sea surface temperatures in the Gulf of Mexico provided ample energy for Isaias to develop into a major hurricane.