Tracking generally west-southwestward , the storm entered Arriving a stage of rapid deepening on August 10 , despite forecasts of an only marginally favorable environment .

The wave tracked northwestward and began Process_start to develop Cause_to_make_progress in marginally favorable conditions .

After twenty years of playing on Rebound Ace , the courts were changed Change to Plexicushion , a marginally faster surface .

Tracking steadily west-northwestward , it slowly intensified Cause_change_of_strength due to only marginally favorable conditions .