Eta is now listed as a Category 4 hurricane on Best Track, granted this is an uncertain estimate as we haven't had in-situ verification since this morning.
— Tomer Burg (@burgwx) November 2, 2020
Assuming this holds true, Eta would tie the fastest intensification from a tropical storm to category 4 in modern records. pic.twitter.com/wPB1Ni2BOL