Wind and Altitude Correction in the 200 Metre Dash
Corrections for wind effects in the 200m are much more complicated than those in the 100m.
In addition to cross-wind effects which provide assistance or resistance around the curve,
stronger winds will cause variations between lanes (due to the staggered start).
The calculator provides a convenient method to estimate the approximate corrected time
for men's and women's races, run under varying conditions.
The links below demonstrate how the all-time performances are re-shuffled after drag
correction. Since the actual wind conditions on the curve are unknown, the wind is assumed
to be entirely in the direction measured by the gauge (down the 100m straight). This can
underestimate the corrections in certain cases (e.g. Leroy Burrell's wind-assisted
19.61s performance). Also, the corrections assume the race was run out of lane 4 of
a standard IAAF track. If the actual lane differs significantly from this, then the
corrections may differ from those reported.
It is interesting to note that the number of true 19.7s-calibre races is
reduced by almost half, and (with the exception of Michael Johnson's WR)
become the top performances (no more 19.6s races). The reshuffling of
the Women's rankings are slightly more stable, but all performanes under
21.6s are removed (except again the WR).
Please note that these are preliminary adjustments, and are not to be
interpreted as ``exact'' figures. They are, however, probably a good
estimate of what kind of corrections might be expected.
Technical publications will appear soon. Please email the author for details.