after peaking with winds of 110 mph (175 km/h) on august 24, humberto began a fujiwhara interaction with hurricane iris. this generated shear on humberto, causing the storm to weaken back to a category 1 hurricane on august 26. humberto continued to weaken until august 28, when it was barely a hurricane. operationally, humberto was erroneously downgraded to a tropical storm on that same day. thereafter, the storm began restrengthening and reached a secondary peak slightly below the threshold for a category 2 hurricane on august 30. while tracking northeastward, humberto began weakening and acquiring extratropical characteristics starting on the following day. later on august 31, humberto weakened to a tropical storm. by 06:00 utc on september 1, the storm was absorbed by an extratropical low while west of the azores.