 Increasing upper @-@ level westerlies caused Alberto to weaken as it moved east @-@ northeastward , with the cyclone losing most of its convection . Early on August 14 , Alberto was downgraded to a tropical storm . A westerly trough that had been guiding Alberto outran the storm , and strong ridging developed to the north and west . As a result , Alberto turned southward on August 15 , southwestward on August 16 , and then to the west on August 17 . While curving northwestward and then northward , Alberto began to re @-@ strengthen , and was upgraded to a hurricane for the third occasion on August 18 . Alberto reached a third peak intensity as a Category 2 hurricane with winds of 105 mph ( 205 km / h ) on August 20 . After weakening back to a Category 1 hurricane , Alberto had completed a cyclonic loop , which it had started on August 13 . Due to decreasing ocean temperatures , Alberto was again downgraded to a tropical storm on August 23 as it accelerated northeastward . Six hours later , Alberto transitioned into an extratropical cyclone while centered about 780 miles ( 1 @,@ 260 km ) south @-@ southwest of Reykjavík , Iceland . 
