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three radars, the one with “less worse” visibility is certainly Monte Lema, which was the
only one able to detect some weak echoes during the 24-hour period shown in Fig. 3a (from
12 UTC of November 4 to 12 UTC of November 5). However, because of beam shielding by
relieves combined with overshooting, the 24-hour radar-derived rainfall amounts above the
central-western part of the Aosta Valley are heavily underestimated: for instance, above
Aosta town, the Swiss weather radar network (see Fig. 3a) shows amounts smaller than 2
mm in 24 hours.
Fig. 2. Digital Elevation map of the north-western part of Italy.
