Set sphinx thumbnail img

dnerini · dnerini · commit b141144dd729 · 2019-04-07T20:12:52.000+02:00
diff --git a/examples/plot_extrapolation_nowcast.py b/examples/plot_extrapolation_nowcast.py
@@ -123,3 +123,5 @@
 xlabel("Lead time [min]")
 ylabel("FSS ( > 1.0 mm/h ) ")
 title("Fractions skill score")
+
+# sphinx_gallery_thumbnail_number = 2
