Hurricanes are large storms that can span 600 miles across with winds spiraling inward and outward between 75 and 200 mph. They form over warm ocean waters above 80 degrees Fahrenheit, which provides energy as the warm air rises and condenses into clouds while winds blow inward and outward. Hurricanes can cause major flooding and damage from high winds and waves, so safety tips during one include staying indoors with supplies, avoiding flood-prone areas, and waiting for officials to say it's safe to go outside after the storm passes.