by early on july 17, chantal attained its peak intensity with maximum sustained winds of 70 mph (110 km/h) and a minimum barometric pressure of . thereafter, the storm began weakening and slowly losing tropical characteristics. at 18:00 utc on july 20, chantal transitioned into an extratropical storm about 225 mi (360 km) east-southeast of cape race, newfoundland. the remnants continued rapidly northeastward and later east-northeastward, before dissipating west of the british isles on july 22. although chantal remained well offshore, the storm dropped heavy rainfall in nova scotia and newfoundland, peaking at on the burin peninsula. further west in nova scotia, heavier precipitation was reported, peaking at near barrington.