Figure 4

Top panel (a): December 2015 sea level pressure (hPa, contour lines), precipitation (mm/day, colors) and surface wind (m/s, arrows) from the ERA-Interim reanalysis (http://apps.ecmwf.int/datasets/). The map has been created with the software Grads (http://cola.gmu.edu/grads/). Bottom panel (b): time series of December sea level pressure (hPa) at Trieste (red dot in panel a), located in the northeastern Adriatic coasts of Italy.