Bertha poses significant risks to coastal and inland areas. Coastal flooding is expected, with water levels potentially rising 2-4 feet (0.6-1.2 meters) above ground in some areas. Heavy rainfall may lead to localized flash flooding, particularly in urban regions. Dangerous surf and rip currents are a threat along the northern Gulf Coast. Additionally, the storm's moisture is expected to interact with a frontal system, causing heavy rain and potential flooding in the Mid-Atlantic and southeastern U.S., including North Carolina and South Carolina, where rainfall totals could reach 6 inches (150 mm) in some areas.