The southern Hemisphere ACE is also on the low side.. and this usually correlates to the Northern Hemisphere ACE. So when i noticed this at a 30 yr low i wrote to Ryan Maue to find out what his thoughts were in regards to the low ACE and the 2010 season coming up...
His response...
With the SH 2009-2010 season being well below normal for unknown reasons to me, it would be a safe bet to assume that the North Atlantic ACE will also be below normal.
If you are not familiar with ACE it is defined as the following:
Accumulated cyclone energy (ACE) is a measure used by the National Oceanic and Atmospheric Administration (NOAA) to express the activity of individual tropical cyclones and entire tropical cyclone seasons, particularly the North Atlantic hurricane season. It uses an approximation of the energy used by a tropical system over its lifetime and is calculated every six-hour period. The ACE of a season is the sum of the ACEs for each storm and takes into account the number, strength, and duration of all the tropical storms in the season
Reference: Bell, Gerald D., Halpert, Michael S., Schnell, Russell C., Higgins, R. Wayne, Lawrimore, Jay, Kousky, Vernon E., Tinker, Richard, Thiaw, Wasila, Chelliah, Muthuvel, Artusa, Anthony. Climate Assessment for 1999. Bulletin of the American Meteorological Society 2000 81: 1328-1328
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