COAPS - Seasonal Tropical Cyclone Activity

2007 Yearly Tropical Cyclone Activity to Date

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By: Ryan N. Maue, Florida State University

Update through Nov 18

Power Dissipation Index (Emanuel 2005)
PDI is simply the cubic version of ACE with considerably more weight to more intense storms.

PDI Distribution Climatology (scaled)

Distribution (1944-2007) of PDI per storm: 1% [1.72] ** 3% [2.32] ** 5% [3.0] ** 10% [4.1] ** 25% [8.8] ** 50% [28.3]
75% [103] ** 90% [216] ** 95% [326] ** 98.5% [504] ** 99% [552] ** Max Ivan [859]

Text File of climatological PDI for each day (values are PDI)
Text File of the % to date of PDI [EPAC, WPAC, NORTHHEMI, NATL]
PDI per storm cumulative % Image

Other Notable World Tropical Cyclones and PDI
Hurricane / SuperTyphoon Ioke 2006 (927)
SuperTyphoon Chaba (WPAC) 2004 (752)
Hurricane Linda (EPAC) 1997 (363) Category 5, strongest on Record
SuperTyphoon Tip (WPAC) 1979 (695) Category 5, lowest ever recorded MSLP of 870 mb

Pre-1944 Notable Hurricanes and PDI
New England Hurricane 1938 (421)
Hurricane 13 of 1936: Landfall North Carolina (297)
Hurricanes 11, 12, 13, 18 of 1933: (198, 213, 236, 234)
Freeport Hurricane of 1932 (55) very rapid pre-landfall development
Cuba Hurricane of 1932 (429)
Bahamas Hurricane of 1932 (447) Category 5
Lake Okeechobee Hurricane of 1928 (537) Category 5
Great Miami Hurricane of 1926 (429) Category 4.9
Hurricane 4 of 1926 (680) Long Cape Verde 22 days duration
Hurricane 2 of 1922 (432) Bermuda
Florida Keys Hurricane of 1919 (447)
Galveston Hurricane of 1915 (325)
Hurricane 3 of 1915 (433) no landfall

2007 North Atlantic Season storm PDI
Andrea 2.3 (Subtropical)
Barry 3.4
Chantal 2.5
Dean 386 (extreme)
Erin 1.3 (weak weak weak)
Felix 215
Gabrielle 4.0
Humberto 8.2
Ingrid 2.8
Jerry 2.4
Karen 17.2
Lorenzo 6.7
Melissa 1.9
Noel 29.1

ACE (Bell et al. 2000) Climatology

Text File of climatological ACE for each day (values are ACE)
Text File of the % to date of ACE [EPAC, WPAC, NORTHHEMI, NATL] Climatological North Atlantic ACE during calendar year

Northern Hemisphere Plot
Eastern Pacific Plot
Western Pacific Plot

Climatology based upon ACE (Bell et al. 2000) from 1970-2006 for each basin. ACE is not a perfect metric and does not account for storm size. Northern Hemisphere includes Northern Indian Ocean after 1976, which accounts for less than 3% of the yearly total. Data quality is a tremendous issue. The NHC declared extratropical observations were not included, which can account for up to 20% a year in additional ACE. The JTWC only started keeping track of EX phases in 2004, so there are literally 1,000 observations since the 1950s that are likely extratropical in the database (as phished out from the JMA database).

Wikipedia ACE calculation information
Ryan Maue's personal/research homepage at COAPS/FSU

TC Climatology Trivia

Previous years with exceptionally weak ACE activity (to TODAY)
Link: Tab delimited file of % departure from 1970-2006 Mean to date.
Format of Tab file: EPAC, WPAC, NH, NATL

Sorted Historical Departures [% from 1970-2006 mean to date]:
***EPAC ***WPAC ***NH ***NATL
1983 saw a couple powerful typhoons in the Western Pacific in November. 1977 similarly had several late season typhoons. In the Eastern Pacific, 1983 was very active in October and November with 3 Major Hurricanes. Raymond had a particularly long track. The Atlantic season saw no October activity in 1983.

Link: ACE June 1 - November 30, 1970-2006 for each basin

Wikipedia 2007 Hurricane Season

The views and opinions expressed in this site are strictly those of the site author and in no way represent those of COAPS, the Florida State University, the Board of Trustees, nor the State of Florida.