original: a new frontal ridge had formed on august 17 which caused the storm to drift in a westerly direction .
simplifications: a new frontal ridge was made on august 17 which caused the storm to go west . a new frontal ridge had formed on august 17 , which caused the storm to drift in a westerly direction . a new frontal ridge had formed on august 17 which caused the storm to drift in a westerly direction . a new frontal ridge formed on august 17 , which caused the storm to drift in a westerly direction . a new foremost ridge had formed on august 17 which caused the storm to move towards the west . a new frontal ridge had formed on august 17 which caused the storm to drift to the west . the storm drifted westerly due to a frontal ridge that formed on august 17 . a new frontal ridge had formed on august 17 which caused the storm to drift in a westerly direction