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”Best-Track” Bulletin
World Meteorological Organization (WMO) header : AXIO20 FMEE
This bulletin gathers the analysed data which detail the structure of a tropical system during its life
cycle. It contains ”optimized” data which are viewed as the best data, obtained with all the available
observations and analysis tools. These data result from an expertise and a post re-analysis of all the
data gathered in real time or not, and therefore they can be different from the data issued in real time
in the advisories and operational bulletins.
No need to say the ”quality” of the ”best-track” data depends strongly on both the number and the
reliability of the available observation data (and so, on the available technology - mainly spatial
technology as the major part of the data comes from the satellites for the basins that do not benefit
from any reconnaissance aircrafts). The ”quality” of the ”best-track” data depends as well on the
quality of the tools and technologies we use for the analysis when provided data are not observed but
estimated (this is the case for the estimation of the tropical system intensity for example).
This bulletin ”best-track” is usually issued in the course of the month following the end of a tropical
system which has reached a significant intensity during its life, and respect the format recommended
by the WMO.
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