Dvorak technique
Doris made meteorological history when, on August 31, it became the first Atlantic hurricane ever to be upgraded to hurricane intensity solely on the basis of satellite pictures, via the Dvorak technique. The cyclone then curved northward and intensified further during the next few days, becoming a Category 2 hurricane early on September 2. Based on the Dvorak technique, it is estimated that Doris peaked with maximum sustained winds of 110 mph (175 km/h) and a minimum barometric pressure of shortly thereafter. By September 3, the hurricane began interacting with a non-tropical low pressure area. On the following day, Doris quickly weakened to a tropical storm and transitioned into an extratropical cyclone about south-southeast of Cape Race, Newfoundland, around 06:00 UTC. The extratropical remnants weakened and then dissipated late on September 4.