On the Variations in Precipitable Water over Some West African Stations during the Special Observation Period of WAMEX

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Abstract
The precipitable water was computed from the upper air data for ten West African stations for the Special Observation Period (SOP) of the West African Monsoon Experiment (WAMEX), 14 July to 15 August 1979. The periodicity and the vertical distribution of precipitable water values were investigated. Comparisons of the precipitable water values showed that high positive and significant correlation existed between low-level and upper-level values for stations within the convective zone but at the coastal stations, very low but weakly significant (poor and nonsignificant at one station) correlations existed between the low-level and upper-level values. A period of 4.4 days in the precipitable water was obtained at one of the stations for which data were reliable. The relationship between this period and the period of some West African weather systems could not, however, be established with the data available.

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