(b) Isochrones and polygons of fire potential. Figure 25. Image of the isochrones (grey and coloured), perimeter, and potential impact (green polygons) of the vegetation fire of the 2021 Santa Coloma de Queralt Fire (Catalonia, Spain) during 24-27th of July, 2021 (b) obtained using on-field and aerial photographs and videos, direct observations and crew positioning and reporting (a). The analysis of the increase of the fire during the 24th (second day) indicated 370ha had grown since 2:00h (part of the perimeter indicated in colour). It also showed that from 20:00h to 21:30h 180 ha had burned during the formation and fall of the pyrocumulus, with a run of 3.3 km/h. The graph was also useful to observe that the average speed of the 23rd day (first day) had been 1500 m/h approx., that of the 24th day (second day) was 600 m/h approx. and that the fire reached a total surface area of 1426 ha. Source: CFRS
Figure 26. Image of the 2021 Santa Coloma de Queralt Fire (Catalonia, Spain) from the 23-27th of July 2021 in which perimeter (purple) is delimited using crews positioning (yellow, red and blue rectangles). Green dotted line shows potential fire polygons and arrows (red: high probability, orange: medium probability) indicate the linkages between polygons and the numbers in white squares indicate the order in which they fire could spread. Source: CFRS
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