Below Normal Extremes…2021 Northern Hemisphere Cyclone Activity Below Normal…US Tornadoes Below Normal
By P Gosselin on 20. November 2021
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By meteorologist Paul Dorian
The accumulated cyclone energy (ACE) is the best measure of overall tropical activity and it is below-normal for the 2021 season across the Northern Hemisphere.
Data: Colorado State University, NOAA
Overview
Tropical cyclone activity across the Northern Hemisphere has been below-normal in 2021 in much the same way as it was last year. Specifically, while the Atlantic Basin featured above-normal tropical activity in this year and last, the Pacific Ocean experienced below-normal conditions in both years leading the way to below-normal levels across the hemisphere as a whole.
In terms of tornadoes, it has been another below-normal season in the US with no EF-5’s recorded. There was, however, tornadic activity in some unusual places in 2021 including the Mid-Atlantic and New England.
Colder-than-normal sea surface temperatures continue to dominate the scene in the equatorial part of the Pacific Ocean. These “La Nina” conditions likely played an important role in the above-normal tropical activity across the Atlantic Basin in 2021 and the below-normal activity in the Pacific Ocean. Map NOAA, tropicaltidbits.com
https://notrickszone.com/2021/11/20/below-normal-extremes-2021-northern-hemisphere-cyclone-activity-below-normal-us-tornadoes-below-normal/
