 The hurricane continued westward or slightly north of due west.Late on August 10, deep convection significantly expanded and became more symmetric, while Dvorak intensity estimates indicated that Dora reached Category 4 intensity; the NHC upgraded the storm to a Category 4 hurricane accordingly.Later on August 11, the NHC predicted relatively slow weakening beginning in about 24 hours, as the storm would cross over slightly colder sea surface temperatures in the wake of Hurricane Eugene.