Quantifying the probability and causes of the surprisingly active 2018 North Atlantic hurricane season

Details

• Journal Title:
  Earth and Space Science
• Personal Author:
  Saunders, M. A. ; Klotzbach, P. J. ; Lea, A. S. R. ; Schreck, C. J. ; Bell, M. M.
• NOAA Program & Office:
  NESDIS (National Environmental Satellite, Data, and Information Service) ; NCEI (National Centers for Environmental Information) ; CICSP (Cooperative Institute for Climate Science)
• Description:
  The 2018 North Atlantic hurricane season was a destructive season with hurricanes Florence and Michael causing significant damage in the southeastern United States. In keeping with most destructive hurricane seasons, basinwide tropical cyclone activity was above average in 2018—by ~25% for named storm numbers, hurricane numbers, and Accumulated Cyclone Energy (ACE). In contrast to this above-normal activity, the August–September tropical environmental fields that explain ~50% of the variance in Atlantic basin hurricane activity between 1950 and 2017 anticipated a well below-average 2018 hurricane season. The surprisingly large mismatch between the observed and replicated levels of hurricane activity in 2018 is an extreme example of the uncertainty inherent in seasonal hurricane outlooks and highlights the need for these outlooks to be issued in terms of probability of exceedance. Such probabilistic information would better clarify the uncertainty associated with hurricane outlooks to the benefit of users. With retrospective knowledge of the August–September 2018 key tropical environmental fields, the chance that the observed 2018 Atlantic hurricane activity would occur is about 5%. The reasons for the surprisingly high hurricane activity in 2018 are a hurricane outbreak in early September and, in particular, the occurrence of unusually high tropical cyclone activity in the subtropical North Atlantic. The hyperactive subtropical activity was not anticipated because contemporary statistical models of seasonal Atlantic hurricane activity lack skill in anticipating subtropical ACE compared to tropical ACE.
• Keywords:
  Hurricanes Prediction
• Source:
  Earth and Space Science, 7, e2019EA000852
• DOI:
  https://doi.org/10.1029/2019EA000852
• Document Type:
  Journal Article
• Funding:
  Grant no. NA14NES4320003
• Place as Subject:
  Atlantic Ocean
• Rights Information:
  CC BY
• Compliance:
  Submitted
• Main Document Checksum:
  urn:sha256:81b1d603af1b982a74581bf78db62b359e8551081bf55fd948ddedb6c17279b1
• Download URL:
  https://repository.library.noaa.gov/view/noaa/45296/noaa_45296_DS1.pdf
• File Type:
  [PDF - 35.72 MB ]