The blink comparator above shows how SST anomalies have changed since early September.
A few interesting things going on.
Danielle’s cold spot in the middle of the image has largely equilibrated back to normal.
The very warm water in the North Atlantic, Great Lakes and Hudson Bay has cooled dramatically, due to cold air which has settled over the region.
Temperatures from the Cape Verde Islands to Florida are pretty close to normal.
Temperatures south of Cuba, and in the Gulf of Mexico have warmed. The sudden appearance of Karl last week was probably due to this.