*3.3.1 Rainstorm events during January 2021*

The daily rainfall amount in mm was obtained from the nearest weather station situated in Gozo (**Table 3**). Winds from the south reached an average speed 25 km/hr.

The computation and mapping of CHLA and TSM are shown in **Figures 7**–**13**. Histograms for coastal water quality showed that for the first part and end part of the event the CHLA is positively skewed (**Figure 8**), implying that concentrations returned to pre-rainfall conditions. The combined histogram (**Figure 9**) expressed the variation of concentrations before and after the rainstorm, which coincides with the climatological extent obtained for January based on MERIS data (**Figure 10**).

The TSM concentration showed a slight increase toward higher levels on the second date (**Figure 11**). However, the shift was less evident than for CHLA as
