HURDAT

In the unadjusted HURDAT dataset the integrated increase in eastern Atlantic activity is nominally larger than the decrease in the western basin Fig.

YTD Hurricane Activity « Climate Audit 2007

Here is a comparison of the original HURDAT to the latest revised.

YTD Hurricane Activity « Climate Audit 2007

If you take the HURDAT and not account for EX, since 1971, you will have added in over 200 extra storm days EX phase with winds 35 knots.

YTD Hurricane Activity « Climate Audit 2007

The tracks in HURDAT identified by the asterisk* are the ones used in calculating ACE.

YTD Hurricane Activity « Climate Audit 2007

In the early HURDAT years the data was sparse and the analysts took a best guess as to where a disturbance became a storm turned yellow on the maps.

YTD Hurricane Activity « Climate Audit 2007

Maps of changes in TC density from both the unadjusted HURDAT and ship-track-based adjusted dataset allow us to explore the spatial structure of the long-term changes in tropical storm activity in the North Atlantic Fig.

YTD Hurricane Activity « Climate Audit 2007

The README webpage, HURDAT description discusses the E flag for extratropical storm.

YTD Hurricane Activity « Climate Audit 2007

The HURDAT Best Tracks files for the Eastern Pacific and Atlantic basins through 2006 are now available here.

East Atlantic Storm-Days « Climate Audit 2007

Eight new tropical storms were added during this period and one of the original tropical storms in HURDAT was removed.

YTD Hurricane Activity « Climate Audit 2007

My conjecture is that part of the explanation lies in changes in how the early HURDAT construction effort handled the initial stages of systems.

YTD Hurricane Activity « Climate Audit 2007