Hurricane Bertha (2008) weakened to a tropical storm on July 13, and a large upper-level low over the central Atlantic steered it east and southeast. After generally maintaining its strength for several days, an eye redeveloped and convection became more symmetric about the feature on July 18, prompting the NHC to upgrade Bertha to a hurricane around 18:00 UTC that day. The storm rapidly accelerated ahead of a trough off the East Coast of the United States, forcing Bertha into rapidly cooler waters. Its wind field became extremely asymmetric and deep convection near the center dissipated, indicative of an extratropical transition that Bertha
Hurricane Bertha (1990) Operationally, forecasters at the National Hurricane Center speculated whether Bertha was transitioning into a subtropical cyclone, due to its deep convection being located, at times, over 200 miles (321.8 km) from the center. However, the convection progressively returned to the center and by late on July 30, Bertha re-intensified into a hurricane as the convection covered the center, about 415 miles (667.8 km) east of where it first formed. Early on July 31, the hurricane briefly attained peak winds of 80 mph (130 km/h) before weakening and accelerated northeastward as the ridge of high pressure was slowly eroded. Bertha maintained