Continuing to organize , Dora reached hurricane strength late on July 20 , before rapidly intensifying into a major hurricane later the next day .
Just three hours later , the system was upgraded to Dora , the fourth tropical storm of the 2011 Pacific hurricane season .
Continuing to organize , storm reached hurricane strength late on July 20 , before rapidly intensifying into a major hurricane later the next day .
Just three hours later , the system was upgraded to Dora , the fourth tropical storm of the 2011 Pacific hurricane season .