Low layer wind shears are dangerous for planes. Their observation and study are one of the main fields where the aeronautical community is waiting for a progress after their meeting held in Paris in 1964 where it was recommended for the first time to study this phenomenon over the world airports. Leopold Sedar Senghor Dakar Airport is situated on a peninsula where wind shears between the surface and the altitude of 110 m had been observed during a campaign in 1968/1969. Using twice-daily radiosonde data and Era-Interim reanalyses we compute the wind speed vertical gradients for all available levels between the surface and 850 hPa. It is shown that reanalyses smooth the vertical profiles and do not indicate the small scale large wind shear values displayed by radiosonde.
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