Favorable environmental conditions , such as low wind shear and warm sea surface temperatures , allowed Preventing_or_letting the system to intensify Cause_change_of_strength into a severe tropical storm by July 12 .

Favorable conditions allowed Preventing_or_letting it to attain Getting hurricane Catastrophe status on September 14 , and the next day Ingrid attained Getting peak winds of 140 km/h ( 85 mph ) .

Favorable environmental conditions allowed Preventing_or_letting Anna to reach Arriving hurricane Catastrophe intensity late on July 20 .

Favorable conditions in the open Atlantic allowed Preventing_or_letting for Frederic to reach Arriving hurricane Catastrophe intensity on September 1 .

Favorable conditions caused Causation Gabrielle to continue to strengthen Cause_change_of_strength , with the storm nearly reaching hurricane status late on August 11 .

Favorable conditions allowed Preventing_or_letting Imbudo to intensify Cause_change_of_strength , gradually at first before undergoing rapid deepening on July 19 .

Favorable environmental conditions allowed Preventing_or_letting for additional strengthening Cause_change_of_strength , and the storm Catastrophe ultimately attained Achieve peak ten-minute sustained winds of 175 km/h ( 110 mph ) on July 16 .