On August 30, an area of low pressure formed along a decaying frontal zone over the central subtropical Atlantic.[79] The disturbance quickly organized and developed into Tropical Depression Five early on September 1 before strengthening into Tropical Storm Danielle later that evening.[80] The storm continued to strengthen and became a Category 1 hurricane on September 2.[81] It stalled the following day, caught south of a blocking high, and weakened back into a tropical storm due to upwelling of cooler waters and some dry air.[82] Later, the storm began drifting toward the west, where it again strengthened into a hurricane overnight September 3–4.[83] After turning northwestward, Danielle reached its peak intensity with sustained winds of 90 mph (150 km/h) early on September 5,[84] It then moved over a relatively cool part of the Gulf Stream and weakened to a low-end Category 1 hurricane.[85] Danielle briefly re-intensified when it moved over marginally warm waters on September 7, but resumed a weakening trend shortly afterwards.[86] Danielle weakened to a tropical storm on September 8[87] before transitioning into an extratropical cyclone later that day.[88]