Fast-moving Hurricane Helene is advancing across the Gulf of Mexico toward Florida and it’s been upgraded to a major Category 3 storm. Forecasters say the storm is threatening a “catastrophic” storm surge in northwestern parts of Florida as well as damaging winds, rains and flash floods hundreds of miles inland across much of the southeastern U.S. Landfall is expected Thursday evening. The governors of Florida, Georgia, the Carolinas and Virginia have all declared emergencies in their states. In the Pacific, former Hurricane John has strengthened back into a hurricane, threatening areas of Mexico’s western coast with flash flooding and mudslides.