Figure 6
Tentative reconstruction of atmospheric configurations over Europe and North Africa in correspondence with negative (left) and positive (right) NAO index. Blue arrows indicate the direction and intensity of storm tracks. Possible positions of the Azores High, North African High, Central European High, and Icelandic Low are also indicated, together with low pressure areas with precipitations. The Gaeta record is represented by a red dot, sites shown in Fig. 5 by yellow dots and other sites mentioned in the text by green dots. The background map (Mollweide projection) was retrieved from Natural Earth, a free vector and raster map data of public domain (http://www.naturalearthdata.com). The final map was generated using both Corel Draw Suite X8 (https://www.coreldraw.com) and QGIS version 2.18.15 ‘Las Palmas’ (QGIS Development Team, 2017. QGIS Geographic Information System. Open Source Geospatial Foundation Project https://www.qgis.org/it/site/).
