The storm accelerated northeastward over an area of progressively colder water temperatures, and after a decrease in convection the National Hurricane Center ceased issuing advisories as Chantal began undergoing extratropical transition early on August 1.

Shortly thereafter, the extratropical remnant crossed over southeastern Newfoundland before tracking into the open waters of the north Atlantic Ocean.

[4] Upon receiving its classification, the depression consisted of a partially exposed low-level center with deep convection occupying the northeastern semicircle.

Located over sea surface temperatures of about 80 °F (27 °C), one forecaster noted the depression had "a small window of opportunity... for it to reach tropical storm strength before transitioning to an extratropical cyclone.

"[5] Convection increased further over the center, and at around 0600 UTC on July 31 the depression intensified into Tropical Storm Chantal while located about 530 miles (850 km) south of Halifax, Nova Scotia.

[1] The precursor disturbance to Chantal began affecting Bermuda on July 30, producing scattered storms and increased cloud cover.

[10] After Chantal passed Bermuda, a ship with the call sign C60Y4 recorded sustained winds of 37 mph (60 km/h) over the open waters of the north Atlantic Ocean.

[5] At around 2300 UTC on July 31, a buoy to the southeast of Nova Scotia reported a pressure of 995 mbar as Chantal passed nearby.