). The calculations were performed on an 8 × 8 km horizontal grid for the period 1961–
2006 with meteorological outputs every 6 hours using daily precipitation values. An Extreme
Value Analysis (EVA) was made for each grid-point using the Block Maxima method. Because
the 1M5 map is based on an NWP
output, it covers the whole of Iceland with 1,650 values. In
contrast, a map based solely on observed
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