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Spatial evaluation of volcanic ash forecasts using satellite observations

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Figure 1. Ash column loading at 00:00 UTC on 14 May 2010 (a) by the satellite (with 5 h smoothing), (b) simulated by NAME, (c) NAME simulated ash cloud after pixel matching (i.e.
Figure 3. The pixel matched NAME ash cloud (grey shading) compared to the satellite retrieved ash cloud (black outline) with (a) no stretch, (b) stretch factor 0.5, (c) stretch factor 1.2, (d) stretch factor 2.
Figure 4. The FSS as a function of neighbourhood size for each of the three translations (dashed line: stretch factor 0.5, dot-dash line: stretch factor 1.2 and dotted line: stretch  fac-tor 2) compared to the original NAME simulation (solid black line) sh
Figure A1. The median RMSE between the SEVIRI observations at t 0 (“truth”) and the truth with 50 % of the pixels randomly replaced by the time averaged observations for each day 8 May 2010–14 May 2010 (8 May: grey stars, 9 May: grey downward-pointing tria

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