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In the last years satellite remote sensing applications in hydrology have considerably progressed. A new multi-temporal satellite data-analysis approach has been recently suggested in order to estimate space-time changes of geophysical parameters possibly related to the increase of environmental and hydro-geological hazards. Such an approach has been already used both for flooded area mapping (using AVHRR data) and for soil wetness index estimation (using AMSU data). <P style=&quot;line-height: 20px;&quot;> In this work, a preliminary sensitivity analysis of the proposed Soil Wetness Variation Index (<I>SWVI</I>) is made in the case of low intensity meteorological events by the comparison with hydrological (precipitation) data. This analysis, as a first step of a more complex work in progress, is targeted to a first evaluation of the reliability of the <I>SWVI</I> in describing soil response to precipitations of different duration and intensity.