At its closest approach to the Avalon Peninsula, Isaac was still tropical, and had maximum sustained winds of and a minimum central pressure of 993 mbar. Strongest winds on land in Newfoundland were reported at Cape Race, where a maximum gust to with a sustained wind of was recorded. At Cape Pine, a peak wind was reported at . However, due to Isaac's small size and fast forward speed, winds were lighter over most of the Avalon Peninsula.