Moderate (🟡) to severe (🟠) marine heatwave conditions surround both Nova Scotia + Newfoundland & cover a wide expanse of the North Atlantic.

This is one of the factors that will allow Fiona to maintain its strength on approach, leading to destructive impacts. pic.twitter.com/ney38BFq2x

— Ben Noll (@BenNollWeather) September 20, 2022